Antimony germanides or antimonide germanides are compounds containing germanium and antimony along with one or more metals. Bonding is only partially ionic, and can be considered as a Zintl phase, rather than antimonide ions with germanide ions. There are often covalent bonds between the antimony, reducing its apparent valence.
Some of the compounds have varying ratios of antimony and germanium. For example at 600 °C Gd5Sb3 and Gd5Ge3 can form a solid solution.
Gold does not form a ternary compound, and neither does gallium or bismuth.
Germanium containing antimonides have been investigated for use in thermoelectric materials.
Production Antimonide germanide compounds can be made by heating a mixture of the powdered elements together at 600° or higher. Tantalum is used as the crucible material, as it does not react. Oxygen must be excluded to stop oxides from forming.
Related Related compounds include substitution of germanium with other elements from group 13 or 14: SiSb, SnSb, PbSb, AlSb, GaSb, and InSb. Replacing antimony with other pnictides can form related compounds such as phosphidosilicates, arsenidosilicates, phosphidogermanates, arsenidogermanates, phosphidostannates, arsenidostannates, phosphidoplumbates, and arsenidoplumbates.
List formulasystemspace groupunit cellvolumedensitycommentrefTiGeSbtetragonalP4/nmma = 3.7022 c = 8.214 Z = 2112.58 Fe3Ge2SbhexagonalP6/mmma = 8.9070 c = 7.9217FeGe1−𝑥Sb𝑥 x<0.05hexagonalP6/mmmFeGe1−𝑥Sb𝑥 0.1<x<0.2hexagonalP63/mmmTi0.5Fe6Ge5SbhexagonalP6/mmma=8.845 c=7.9785 Z=3Cr0.8Fe5.3Ge5.2Sb0.8hexagonalP6/mmma=8.850 c=8.025 Z=3Mn1.8Fe4.6Ge4.9Sb1.1hexagonalP6/mmma=8.910 c=7.9665 Z=3CoGexSb1-xhexagonalP63/mmmGe and Sb disorderedCo3Ge2SbhexagonalP6/mmma = 8.913 c = 7.6312 Z = 6Cu6GeSbhexagonalP63/mmca=4.16, c=7.47Ge2GaSbcubicgallium antimonide and germanium forma solid solutionY5Sb2Ge2ZrGeSbZrGe0.211Sb1.78orthorhombicPnmaa = 7.304 b = 3.9513 c = 9.576 Z=4276.357.763NbGeSbtetragonalP4/nmma=3.75 c=8.30ZnIn18GeSb20La5Ge3SbhexagonalP63/mcma=9.156 c=7.231 Z=2525.0La6Ge2.8Sb13.2orthorhombicImmma = 4.3034 b = 10.851 c = 27.073 Z=21272.6Metallic; columns of trigonal prismsLa12Ge6.6Sb21orthorhombicImmma=4.3165 b=15.205 c=34.443 Z=2Ce2GeSb3orthorhombicCmmmSb ZigZag chainCe3GeSbCe5Ge3Sb2Ce6Ge5Sb12orthorhombicImmma=4.2972 b=10.740 c=26.791 Z=21236.4Metallic; columns of trigonal prismsCe12Ge5.2Sb26.8C222a=8.6075 b=21.5154 c=26.82274967.47.117Pr6Ge5Sb12orthorhombicImmma=4.2574 b=10.677 c=26.626 Z=21213.1Metallic; columns of trigonal prismsPr12Ge6.48Sb21orthorhombicImmma=4.2578 b=114.9777 c=33.938 Z=22164.37.240Nd6Ge3.61Sb12.4orthorhombicImmma = 4.2310 b = 10.6362 c = 26.526 Z=21197.8Metallic; columns of trigonal prismsSm6Ge5Sb12orthorhombicImmma=4.1932 b=10.537 c=26.350 Z=21164.5Metallic; columns of trigonal prismsGd4Ge1.97Sb1.03cubicI3da=9.0111Gd5Ge0.9Sb3.1orthorhombicCmce a = 12.241, b = 8.025, c = 8.039 Z=48.539light greyGd2Ge3.28Sb0.65orthorhombicCmcma = 4.0198, b = 30.373, c = 4.1340 Z=48.440greyGd6Ge4.3Sb11.7orthorhombicImmma = 4.1509 b = 10.4438 c = 26.2400 Z=21136.7Metallic; columns of trigonal prismsGd8Ge13.29Sb1.72orthorhombicCmcma = 4.02832 b =30.4101 c = 4.14426 Z=1507.687.953Gd1.02 Sc0.98Ge0.9Sb0.1tetragonalI4/mmma=4.2730 c=15.658ferromagnetic < 333KGd1.02 Sc0.98Ge0.5Sb0.5tetragonalI4/mmma=4.3277 c=15.904ferromagnetic < 170KGd1.02 Sc0.98Ge0.2Sb0.8tetragonalP4/nmma=4.3192 c=8.1461Tb6Ge5Sb12orthorhombicImmma=4.1305 b=10.393 c=26.139 Z=21122.1Metallic; columns of trigonal prismsDy6Ge5Sb12orthorhombicImmma=4.103 b=10.345 c=26.014 Z=21104.2Metallic; columns of trigonal prismsDy5Sb2Ge2orthorhombicCmcaHo5Sb2Ge2orthorhombicCmcaEr5Sb2Ge2orthorhombicCmcaTm5Sb2Ge2orthorhombicCmcaYb8Ge3Sb5tetragonalI4/mmma=15.8965 c=6.8206 Z=41723.68.520metallic silver; 1∞(Ge3)4-; negative thermal expansion under 15 KCaYb4Al2Sb5.8Ge0.2orthorhombicCaYb4Al2Sb5.5Ge0.5orthorhombicP1m1a=13.9770 b=4.4203 c=11.9985741.30CaYb4Al2Sb5.3Ge0.7orthorhombicHfGe0.205Sb1.795orthorhombicPnmaa=7.312 b=3.943 c=9.488 Z=4273.510.002Hf3Cu2Ge3.58Sb1.42tetragonalP4/nmma = 3.8023 c = 24.575 Z=2355.310.241
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