{{synthesis|date=August 2023}}
{{Short description|Chemical compounds containing H+ and N– ions in a single phase}}
In chemistry, a '''hydridonitride''' ('''nitridohydride''', '''nitride hydride''', or '''hydride nitride''') is a chemical compound that contains both hydride ({{chem2|H-}}) and nitride ({{chem2|N(3-)}}) ions. These inorganic compounds are distinct from inorganic amides and imides as the hydrogen does not share a bond with nitrogen, and usually contain a larger proportion of metals.{{cn|date=August 2023}}
==Structure== The hydride ion {{chem2|H-}} is stabilised by being surrounded by electropositive elements such as alkalis or alkaline earths.<ref name="falb">{{cite journal |last1=Falb |first1=Nathaniel W. |last2=Neu |first2=Jennifer N. |last3=Besara |first3=Tiglet |last4=Whalen |first4=Jeffrey B. |last5=Singh |first5=David J. |last6=Siegrist |first6=Theo |date=14 February 2019 |title=Ba3CrN3H: A New Nitride-Hydride with Trigonal Planar Cr |url=https://figshare.com/articles/Ba3CrN3H_A_New_Nitride-Hydride_with_Trigonal_Planar_Cr4_/7418429 |journal=Inorganic Chemistry |volume=58 |issue=5 |pages=3302–3307 |doi=10.1021/acs.inorgchem.8b03367 |pmid=30762348 |s2cid=73438467}} [https://doi.org/10.26434/chemrxiv.7418429.v1 ChemRxiv]</ref> Quaternary compounds exist where nitrogen forms a complex with bonds to a transition or main group element. The hydride requires the presence of another alkaline earth element.<ref name=falb/>
==Production== Hydridonitrides may be produced by a process called self-propagating high-temperature synthesis (SHS) where a metal nitride is ignited in a hydrogen atmosphere.<ref name=ale>{{cite journal |last1=Aleksanyan |first1=A.G |last2=Aghajanyan |first2=N.N |last3=Dolukhanyan |first3=S.K |last4=Mnatsakanyan |first4=N.L |last5=Harutyunyan |first5=Kh.S |last6=Hayrapetyan |first6=V.S |title=Thermal-radiation synthesis of zirconium hydridonitrides and carbohydrides |journal=Journal of Alloys and Compounds |date=January 2002 |volume=330-332 |pages=559–563 |doi=10.1016/S0925-8388(01)01519-5 |url=http://fire-ball-2007.narod.ru/32245614.pdf}}</ref>
A metal (Ti, Zr, Hf, Y) can also be ignited in an atmosphere mixing hydrogen and nitrogen, and a hydridonitride is formed exothermically.<ref>{{cite journal |last1=Dolukhanyan |first1=S. K. |last2=Aleksanyan |first2=A. G. |last3=Shekhtman |first3=V. Sh. |last4=Hakobyan |first4=H. G. |last5=Mayilyan |first5=D. G. |last6=Aghadjanyan |first6=N. N. |last7=Abrahamyan |first7=K. A. |last8=Mnatsakanyan |first8=N. L. |last9=Ter-Galstyan |first9=O. P. |title=Synthesis of transition metal hydrides and a new process for production of refractory metal alloys: An autoreview |journal=International Journal of Self-Propagating High-Temperature Synthesis |date=2 July 2010 |volume=19 |issue=2 |pages=85–93 |doi=10.3103/S1061386210020020|s2cid=137089432}}</ref>
The molten metal flux technique involves dissolving metal nitrides and hydrides in an excess of molten alkaline earth metal, by heating till everything is molten, and then cooling until crystals form, but the metal is still liquid. Draining the liquid metal (and centrifuging) leaves the crystals of hydridonitride behind. A eutectic molten metal allows it to be cooled more.<ref name=falb/>
If liquid alkali metal is used as a flux to grow a hydridonitride crystal, excess metal can be removed using liquid ammonia.<ref name=":0">{{Cite journal|last1=Niewa|first1=R.|last2=Zherebtsov|first2=D. A.|date=January 2002|title=Redetermination of the crystal structure of tetralithium mononitride monohydride, Li4NH|journal=Zeitschrift für Kristallographie - New Crystal Structures|volume=217|issue=JG|pages=317–318|doi=10.1524/ncrs.2002.217.jg.317|issn=2197-4578|doi-access=free}}</ref>
==Properties== Some hydridonitrides are sensitive to water vapour in air.<ref name=mot/> For non-stoichimetric compounds, as the proportion of hydrogen increases, the unit cell dimensions also increase, so hydrogen is not merely filling holes.<ref name=":1">{{Cite book|last1=Hampton|first1=Michael D.|chapter-url=https://books.google.com/books?id=4otqCQAAQBAJ&pg=PA360|page=361|doi=10.1007/978-94-010-0558-6_35|chapter=Structural Peculiarities of Multicomponent Hydridonitrides on the Basis of Metals of IV–V Groups Produced by SHS Method|title=Hydrogen Materials Science and Chemistry of Metal Hydrides|last2=Schur|first2=Dmitry V.|last3=Zaginaichenko|first3=Svetlana Yu|last4=Trefilov|first4=V. I.|date=2012-12-06|publisher=Springer Science & Business Media|isbn=978-94-010-0558-6|language=en}}</ref> When heated to a sufficiently high temperature, hydridonitrides lose hydrogen first to form a metallic nitride or alloy.<ref name=":2">{{Cite journal|last=Dolukhanyan|first=S|date=May 1995|title=Interaction of hafnium with hydrogen and nitrogen in the combustion regime|journal=International Journal of Hydrogen Energy|language=en|volume=20|issue=5|pages=391–395|doi=10.1016/0360-3199(94)00059-9|bibcode=1995IJHE...20..391D}}</ref>
===Room temperature superconductor=== {{anchor|Lutetium hydride nitride}} One lutetium hydride doped with nitrogen is claimed to be a room-temperature superconductor at up to 21°C at a pressure of 1 GPa, which is considerably lower than for other polyhydrides.<ref name=":3">{{Cite journal |last1=Dasenbrock-Gammon |first1=Nathan |last2=Snider |first2=Elliot |last3=McBride |first3=Raymond |last4=Pasan |first4=Hiranya |last5=Durkee |first5=Dylan |last6=Khalvashi-Sutter |first6=Nugzari |last7=Munasinghe |first7=Sasanka |last8=Dissanayake |first8=Sachith E. |last9=Lawler |first9=Keith V. |last10=Salamat |first10=Ashkan |last11=Dias |first11=Ranga P. |date=2023-03-09 |title=Evidence of near-ambient superconductivity in a N-doped lutetium hydride |url=https://www.nature.com/articles/s41586-023-05742-0 |journal=Nature |language=en |volume=615 |issue=7951 |pages=244–250 |doi=10.1038/s41586-023-05742-0 |pmid=36890373 |bibcode=2023Natur.615..244D |s2cid=257407449 |issn=0028-0836|url-access=subscription }}{{Retracted|doi=10.1038/s41586-023-06774-2|pmid=37935926|intentional=yes}}</ref> This has been called "red matter"<ref>{{cite journal |last1=Crane |first1=Leah |title='Red matter' superconductor could transform electronics – if it works |journal=New Scientist |date=8 March 2023 |volume=257 |issue=3430 |page=9 |doi=10.1016/S0262-4079(23)00455-4 |s2cid=257625692 |url=https://www.newscientist.com/article/2363376-red-matter-superconductor-could-transform-electronics-if-it-works/|url-access=subscription }}</ref> as it is red under high pressure, but blue at ambient conditions.<ref>{{cite news |last1=Chang |first1=Kenneth |title=New Room-Temperature Superconductor Offers Tantalizing Possibilities |url=https://www.nytimes.com/2023/03/08/science/room-temperature-superconductor-ranga-dias.html |access-date=9 March 2023 |work=The New York Times |date=8 March 2023}}</ref><ref>{{cite journal |last1=Service |first1=Robert F. |title='Revolutionary' blue crystal resurrects hope of room temperature superconductivity |journal=Science |date=8 March 2023 |volume=379 |issue=6636 |doi=10.1126/science.adh4968}}</ref> The claim has been met with some skepticism as it was made by the same team that made similar claims retracted by ''Nature'' in 2022,<ref>{{Cite journal |last1=Dasenbrock-Gammon |first1=Nathan |last2=Snider |first2=Elliot |last3=McBride |first3=Raymond |last4=Pasan |first4=Hiranya |last5=Durkee |first5=Dylan |last6=Khalvashi-Sutter |first6=Nugzari |last7=Munasinghe |first7=Sasanka |last8=Dissanayake |first8=Sachith E. |last9=Lawler |first9=Keith V. |last10=Salamat |first10=Ashkan |last11=Dias |first11=Ranga P. |date=9 March 2023 |title=Evidence of near-ambient superconductivity in a N-doped lutetium hydride |url=https://www.nature.com/articles/s41586-023-05742-0 |journal=Nature |volume=615 |issue=7951 |pages=244–250 |doi=10.1038/s41586-023-05742-0 |pmid=36890373 |bibcode=2023Natur.615..244D |s2cid=257407449 |via=www.nature.com|url-access=subscription }}{{Retracted|doi=10.1038/s41586-023-06774-2|pmid=37935926|intentional=yes}}</ref><ref>{{Cite news |last=Woodward |first=Aylin |title=The Scientific Breakthrough That Could Make Batteries Last Longer |url=https://www.wsj.com/articles/superconductor-breakthrough-energy-reddmatter-90dfa165 |newspaper=Wall Street Journal|date=8 March 2023}}</ref><ref>{{Cite web |title='Revolutionary' blue crystal resurrects hope of room temperature superconductivity |url=https://www.science.org/content/article/revolutionary-blue-crystal-resurrects-hope-room-temperature-superconductivity |website=www.science.org}}</ref><ref>{{Cite web |author=Margo Anderson |date=March 8, 2023 |title=Room-Temperature Superconductivity Claimed |url=https://spectrum.ieee.org/room-temperature-superconductor |website=IEEE Spectrum |publisher=Institute of Electrical and Electronics Engineers}}</ref><ref>{{cite web |last1=Wood |first1=Charlie |last2=Savitsky |first2=Zack |date=8 March 2023 |title=Room-Temperature Superconductor Discovery Meets With Resistance |url=https://www.quantamagazine.org/room-temperature-superconductor-discovery-meets-with-resistance-20230308/ |access-date=2023-03-14 |website=Quanta Magazine |publisher=Simons Foundation}}</ref> claimed observation of solid metallic hydrogen in 2016 as well as other allegations.<ref>{{Cite journal |last=Garisto |first=Dan |date=2023-03-09 |title=Allegations of Scientific Misconduct Mount as Physicist Makes His Biggest Claim Yet |url=https://physics.aps.org/articles/v16/40 |journal=Physics |language=en |volume=16 |article-number=40|doi=10.1103/Physics.16.40 |bibcode=2023PhyOJ..16...40G |s2cid=257615348 |doi-access=free}}</ref> First attempts to replicate the results have failed.<ref>{{Cite web |last=Wilkins |first=Alex |date=17 March 2023 |title='Red matter' superconductor may not be a wonder material after all |url=https://www.newscientist.com/article/2364955-red-matter-superconductor-may-not-be-a-wonder-material-after-all/ |website=New Scientist |language=en-US}}</ref><ref>{{Cite journal |last1=Ming |first1=Xue |last2=Zhang |first2=Ying-Jie |last3=Zhu |first3=Xiyu |last4=Li |first4=Qing |last5=He |first5=Chengping |last6=Liu |first6=Yuecong |last7=Huang |first7=Tianheng |last8=Liu |first8=Gan |last9=Zheng |first9=Bo |last10=Yang |first10=Huan |last11=Sun |first11=Jian |last12=Xi |first12=Xiaoxiang |last13=Wen |first13=Hai-Hu |date=2023-05-11 |title=Absence of near-ambient superconductivity in LuH2±xNy |journal=Nature |volume=620 |issue=7972 |language=en |pages=72–77 |doi=10.1038/s41586-023-06162-w |pmid=37168015 |pmc=10396964 |s2cid=258638296 |issn=1476-4687}}</ref> Ashcroft suggested metallic hydrogen could superconduct in 1968<ref>{{Cite journal |last=Ashcroft |first=N. W. |date=1968-12-23 |title=Metallic Hydrogen: A High-Temperature Superconductor? |url=https://link.aps.org/doi/10.1103/PhysRevLett.21.1748 |journal=Physical Review Letters |volume=21 |issue=26 |pages=1748–1749 |doi=10.1103/PhysRevLett.21.1748|bibcode=1968PhRvL..21.1748A|url-access=subscription }}</ref> at great pressures and in 2004 similarly that dense group IVa hydrides (as the new material) could also be superconductors at more accessible pressures.<ref>{{Cite journal |last=Ashcroft |first=N. W. |date=2004-05-06 |title=Hydrogen Dominant Metallic Alloys: High Temperature Superconductors? |url=https://link.aps.org/doi/10.1103/PhysRevLett.92.187002 |journal=Physical Review Letters |volume=92 |issue=18 |article-number=187002 |doi=10.1103/PhysRevLett.92.187002|pmid=15169525 |bibcode=2004PhRvL..92r7002A|url-access=subscription }}</ref>
==List== {|class="wikitable" !name !formula !system !space group !unit cell (lengths in Å, volume in Å<sup>3</sup>) !structure !comment !optical !reference |- |Lithium nitride hydride<br />Lithium hydridonitride |{{chem2|Li4NH}} |tetragonal |''I''4<sub>1</sub>/''a'' |a = 4.9865, c = 9.877, V = 234.9, Z = 4 | | |yellow |<ref name=":0" /> |- |calcium hydridonitride |{{chem2|Ca2NH}} |cubic |''Fd''3''m'' |a = 10.13, Z = 16 | | |brown-black |<ref name=mot>{{cite journal |last1=Brice |first1=Jean-Francois |last2=Motte |first2=Jean-Pierre |last3=Courtois |first3=Alain |last4=Protas |first4=Jean |last5=Aubry |first5=Jacques |title=Etude structurale de Ca2NH par diffraction des rayons X, diffraction des neutrons et résonance magnétique nucléaire du proton dans le solide |journal=Journal of Solid State Chemistry|trans-title=Structural study on Ca<sub>2</sub>NH by X-ray-diffraction, neutron-diffraction and proton nuclear magnetic-resonance in the solid |date=February 1976 |volume=17 |issue=1–2 |pages=135–142 |doi=10.1016/0022-4596(76)90213-9|bibcode=1976JSSCh..17..135B}}</ref> |- |tricalcium silicon trinitride hydride |{{chem2|Ca3SiN3H}} |monoclinic |''C''2/''c'' |a = 5.236, b = 10.461, c = 16.389, β = 91.182°, Z = 8 |{{chem2|SiN4}} tetrahedra in chains, {{chem2|Ca6H}} octahedra | | |<ref name="falb" /><ref>{{cite journal |last1=Dickman |first1=Matthew J. |last2=Schwartz |first2=Benjamin V. G. |last3=Latturner |first3=Susan E. |title=Low-Dimensional Nitridosilicates Grown from Ca/Li Flux: Void Metal Ca8In2SiN4 and Semiconductor Ca3SiN3H |journal=Inorganic Chemistry |date=27 July 2017 |volume=56 |issue=15 |pages=9361–9368 |doi=10.1021/acs.inorgchem.7b01532|pmid=28749660}}</ref> |- |Titanium hydridonitride |{{chem2|TiN0.3H1.1}} | | | | | | |<ref name=":1" /> |- | |{{chem2|Ti0.7V0.3N0.23H0.8}} | | | | | | |<ref name=":1" /> |- | |{{chem2|Ca3CrN3H}} |hexagonal |''P''6<sub>3</sub>/''m'' |a= 7.22772 c=5.06172 Z=2 V=228.998 | | | |<ref>{{Cite journal |last1=Cao |first1=Yu |last2=Kirsanova |first2=Maria A. |last3=Ochi |first3=Masayuki |last4=Al Maksoud |first4=Walid |last5=Zhu |first5=Tong |last6=Rai |first6=Rohit |last7=Gao |first7=Shenghan |last8=Tsumori |first8=Tatsuya |last9=Kobayashi |first9=Shintaro |last10=Kawaguchi |first10=Shogo |last11=Abou-Hamad |first11=Edy |last12=Kuroki |first12=Kazuhiko |last13=Tassel |first13=Cédric |last14=Abakumov |first14=Artem M. |last15=Kobayashi |first15=Yoji |date=2022-09-26 |title=Topochemical Synthesis of Ca 3 CrN 3 H Involving a Rotational Structural Transformation for Catalytic Ammonia Synthesis |journal=Angewandte Chemie International Edition |language=en |volume=61 |issue=39 |article-number=e202209187 |doi=10.1002/anie.202209187 |pmid=35929578 |bibcode=2022ACIE...61E9187C |s2cid=251349324 |issn=1433-7851|doi-access=free}}</ref> |- |hexacalcium dichromium hexanitride hydride |{{chem2|Ca6Cr2N6H}} | |''R''{{overbar|3}} |a = 9.0042, c = 9.1898, Z = 3 |planar {{chem2|CrN3(6−)}}, {{chem2|CrN3(5−)}}, octahedral {{chem2|Ca6H(11+)}} | | |<ref name="falb" /><ref>{{Cite journal|last1=Bailey|first1=Mark S.|last2=Obrovac|first2=Mark N.|last3=Baillet|first3=Emilie|last4=Reynolds|first4=Thomas K.|last5=Zax|first5=David B.|last6=DiSalvo|first6=Francis J.|date=September 2003|title=Ca 6 [Cr 2 N 6 ]H, the First Quaternary Nitride−Hydride|journal=Inorganic Chemistry|language=en|volume=42|issue=18|pages=5572–5578|doi=10.1021/ic0343206|pmid=12950205|issn=0020-1669}}</ref> |- |strontium hydridonitride |{{chem2|Sr2NH}} | |''R''{{overbar|3}}''m'' |a = 3.870, c = 18.958 | | |orange-yellow or black |<ref>{{Cite journal|last1=Sichla|first1=Th.|last2=Altorfer|first2=F.|last3=Hohlwein|first3=D.|last4=Reimann|first4=K.|last5=Steube|first5=M.|last6=Wrzesinski|first6=J.|last7=Jacobs|first7=H.|date=1997|title=Kristallstrukturbestimmung an einer Strontium-hydrid-imid-nitrid-Phase - Sr2(H)N/SrNH bzw. Sr2(D)N/SrND - mit Röntgen-, Neutronen- und Synchrotron-Strahlung|journal=Zeitschrift für anorganische und allgemeine Chemie|language=de|volume=623|issue=1–6|pages=414–422|doi=10.1002/zaac.19976230166|issn=0044-2313}}</ref> |- |Lithium distrontium dihydride nitride |{{chem2|LiSr2H2N}} |orthorhombic |''Pnma'' |a = 7.4714, b = 3.7028, c = 13.2986, Z = 4 |{{chem2|[SrH5N2](9−)}}, {{chem2|[SrH4N3](11−)}}, {{chem2|[LiH3N](5−)}} | | |<ref>{{cite journal |last1=Blaschkowski |first1=Björn |last2=Schleid |first2=Thomas |title=Darstellung und Kristallstruktur des Lithium-Strontium-Hydridnitrids LiSr2H2N |journal=Zeitschrift für anorganische und allgemeine Chemie |date=November 2007 |volume=633 |issue=15 |pages=2644–2648 |doi=10.1002/zaac.200700315}}</ref> |- | |{{chem2|Ti0.6Nb0.4N0.4H1.1}} | | | | | | |<ref name=":1" /> |- |zirconium hydridonitride |{{chem2|ZrN0.17H1.65}} | | | | | | |<ref name="ale" /> |- | |{{chem2|Ti0.88Zr0.12N0.28H1.39}} | | | | | | |<ref name=":1" /> |- | |{{chem2|Zr0.7Nb0.3N0.33H1.15}} | | | | | | |<ref name=":1" /> |- | |ZrCr<sub>2</sub>N<sub>0.4</sub>H<sub>1.4</sub> |hexagonal |''P''6<sub>3</sub>/''mmc'' |''a'' = 5.2263, ''c'' = 8.5777, | |catalytic ammonia synthesis | |<ref>{{Cite journal |last1=Cao |first1=Yu |last2=Wei |first2=Zefeng |last3=Al Maksoud |first3=Walid |last4=Rai |first4=Rohit |last5=Kobayashi |first5=Yoji |last6=Kageyama |first6=Hiroshi |date=November 2023 |title=Zr-based Laves phases with nitride/hydride ions for ammonia synthesis |url=https://linkinghub.elsevier.com/retrieve/pii/S1293255823002236 |journal=Solid State Sciences |language=en |volume=145 |article-number=107331 |doi=10.1016/j.solidstatesciences.2023.107331 |bibcode=2023SSSci.14507331C |url-access=subscription }}</ref> |- |barium hydridonitride |{{chem2|Ba2NH}} |hexagonal |''R''{{overbar|3}}''m'' |a = 4.0262, c = 20.469 | |pure {{chem2|H−}} conductor | |<ref>{{cite journal|last1=Altorfer|first1=F|last2=Buhrer|first2=W|last3=Winkler|first3=B|last4=Coddens|first4=G|last5=Essmann|first5=R|last6=Jacobs|first6=H|date=May 1994|title=H−-jump diffusion in barium-nitride-hydride Ba2NH|journal=Solid State Ionics|volume=70-71|pages=272–277|doi=10.1016/0167-2738(94)90322-0}}</ref> |- |Tribarium chromium trinitride hydride |{{chem2|Ba3CrN3H}} |hexagonal |''P''6<sub>3</sub>/''m'' |''a'' = 8.0270, ''c'' = 5.6240, ''Z'' = 2 V=313.83 |planar {{chem2|CrN3(5–)}}, octahedral {{chem2|HBa6(11+)}} |nonmagnetic insulator |green |<ref name="falb"/> |- |Lithium dieuropium nitride trihydride |{{chem2|LiEu2NH3}} |orthorhombic |''Pnma'' |a = 7.4213, b = 3.6726, c = 13.1281, Z = 4 |{{chem2|[Eu(3+)H7N2](10–)}} and {{chem2|[Eu(2+)H6N3](13–)}} | |ruby red |<ref>{{Cite journal|last1=Blaschkowski|first1=Björn|last2=Schleid|first2=Thomas|date=August 2012|title=Mixed-Valent Europium in the Nitride Hydride LiEu2NH3|journal=Zeitschrift für anorganische und allgemeine Chemie|language=en|volume=638|issue=10|page=1592|doi=10.1002/zaac.201204051 |bibcode=2012ZAACh.638.1592B }}</ref> |- |Lutetium hydride nitride |{{chem2|LuH_{3-''x''}N_{''y''}|}} | |''Fm''{{overbar|3}}''m'' | | |< 1 GPa |blue |<ref>{{Cite journal |doi=10.1038/d41586-023-00599-9|title=Hopes raised for room-temperature superconductivity, but doubts remain|journal=Nature|date=8 March 2023|last1=Jin|first1=ChangQing|last2=Ceperly|first2=David|volume=615|issue= 7951|pages=221–222|pmid= 36890377|bibcode=2023Natur.615..221J |s2cid= 257407330}}</ref><ref name=":3" /> |- |Lutetium hydride nitride |{{chem2|LuH_{3-''x''}N_{''y''}|}} | |''Immm'' | | |super conductor at 1 GPa and 21 °C |pink |<ref name=":3" /> |- |Hafnium hydridonitride |{{chem2|HfNH0.6}} |hcp | |a = 3.241, c = 5.198 | | | |<ref name=":2" /> |- |Hafnium hydridonitride |HfNH |hcp | |a = 3.216, c = 5.259 | | | |<ref name=":2" /> |- |Thorium nitride hydride |{{chem2|ThNH2}} |fcc | |a = 5.596 | | | |<ref>{{cite journal |last1=Peterson |first1=D.T |last2=Nelson |first2=S.O |title=Equilibrium hydrogen pressures in the Th-N-H system |journal=Journal of the Less Common Metals |date=August 1981 |volume=80 |issue=2 |pages=221–226 |doi=10.1016/0022-5088(81)90095-3}}</ref> |- |Lanthanum nitride hydride |La<sub>2</sub>H<sub>3–''x''</sub>N |trigonal |''P''−3''m''1 |''a'' = 3.86615, ''c'' = 6.17859, ''V'' = 79.9792 |layered anion ordering |hydride-concentration driven metal–semiconductor transition | |<ref name=":4">{{Cite journal |last1=Wei |first1=Zefeng |last2=Takatsu |first2=Hiroshi |last3=Ubukata |first3=Hiroki |last4=Kato |first4=Daichi |last5=Cao |first5=Yu |last6=Murayama |first6=Kantaro |last7=Zhu |first7=Tong |last8=Tassel |first8=Cédric |last9=Kageyama |first9=Hiroshi |date=2026-04-08 |title=Chemically Defined Ln 2 H 3– x N Nitride-Hydrides via High-Pressure Synthesis and Topochemical Hydrogen Intercalation |url=https://pubs.acs.org/doi/10.1021/jacs.6c02443 |journal=Journal of the American Chemical Society |language=en |volume=148 |issue=13 |pages=14559–14567 |doi=10.1021/jacs.6c02443 |pmid=41914633 |issn=0002-7863|url-access=subscription }}</ref> |- |Neodymium nitride hydride |Nd<sub>2</sub>H<sub>3–''x''</sub>N |trigonal |''P''−3''m''1 |''a'' = 3.73439, ''c'' = 5.97775, ''V'' = 72.1950 |layered anion ordering | | |<ref name=":4" /> |- |Gadolinium nitride hydride |Gd<sub>2</sub>H<sub>3–''x''</sub>N |trigonal |''P''−3''m''1 |''a'' = 3.62778, ''c'' = 5.82556, ''V'' = 66.3972 |layered anion ordering | | |<ref name=":4" /> |}
==References== {{Reflist}}
{{Nitrides}}
* Category:Hydrides Category:Mixed anion compounds