An arsenide hydride or hydride arsenide is a chemical compound containing hydride (H−) and arsenide (As3−) ions in a single phase. They are in the class of mixed anion compounds.
Preparation Arsenide hydride compounds may be produced by heating metal hydride and metal arsenide mixtures under pressure.
Properties
Arsenide hydrides are under investigation as unconventional superconductors.
The hydride ions can be replaced by fluoride or oxide ions to yield variations in composition.
Reactions when heated to 800° CaFeAsH forms three phases.
2CaFeAsH → Ca + CaFe2As2 + H2 nameformulaformspace groupunit cellvolumedensityappearancepropertiesreferenceLiCa3As2HorthorhombicPnmaa = 11.4064(7) Å, b = 4.2702(3) Å, c = 11.8762 Z=4redband gap 1.4 eVCa14As6C0.5,NH5tetragonalP4/mbma = 15.749, c = 9.1062, Z = 4redband gap 1.6 eVCaFeAsHtetragonalP4/nmma = 0.3878 c = 0.8260superconductorCaFeAsF1−xHxnon superconductorCaFe1−xCoxAsHtetragonalP4/nmma increases and c decreases with xsuperconducting 23 K at x= 0.09K2Cr3As3HK1−δCr3As3Hx x<0.45Superconductor Tc=5.8 KLithium tristrontium diarsenide hydrideSr3LiAs2HorthorhombicPnmaa = 12.034, b = 4.4698, c = 12.5907; V = 677.2 Å3Zintl phase; semiconductor; diamagneticLaFeAsO1−xHx (x<0.53)superconductor Tc=36 K with x=0.3La2Ti2As2H2.3tetragonalI4/mmma=3.9595 c=18.0986283.742La2V2As2HxtetragonalI4/mmma=3.9561 c=17.909280.030La2Cr2As2Hx tetragonalI4/mmma=3.9934 c=17.380277.17La2Mn2As2HxtetragonalI4/mmma=4.0556 c=17.46287.2LaMnAsO1−xHx (x=0−0.73)ferromagneticCoLaAsH0.78xorthorhombicI41mda=4.1739 c=14.64254.8blackNiLaAsH0.69orthorhombicI41mda=4.1660 c=14.5993253.37blackCuLaAsH0.78orthorhombicI41mda=4.2302 c=14.5780260.867.08blackLaZn0.5AsHxhexagonalP6/mmma=4.200 c=4.24464.81blackCeFeAsO1−xHx (x<0.5)tetragonalP4/nmma=3.95386 c=8.5926 at x=0.4superconducting 0.1 < x < 0.4; Tc=47 K with x=0.25NdFeAs(O,H)superconductor Tc=40KSmFeAsO1−xHx (x<0.5)superconductor Tc=55 K at x = 0.2.Sm2Mn2As2HxtetragonalI4/mmma=3.9251 c=16.67256.7GdFeAsO1−xHx
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