Tellurogermanates or telluridogermanates are compounds with anions with tellurium bound to germanium. They are analogous with germanates, thiogermanates and selenidogermanates.
Properties Most tellurogermanates are coloured black. They are semiconductors with a small band gap.
Ge4Te104− forms an adamantane structure.
List +crystal systemspace groupcell dimensionsvolumedensityref(Et4N)4Ge4Te10cubicP3ma 22.923blackNa6Ge2Te6monoclinicP21/ca=8.899 b=12.946 c=8.908 β =119.87°K2GeTe4monoclinicP21/ca = 12.703 b = 8.680 c = 9.829 β = 104.8°K4Ge4Te10K6Ge2Te6monoclinicC2/c[K4(H2O)2][GeTe4]monoclinicC2/ca 19.43 b 7.4133 c 13.845 β 129.93°Cr2Ge2Te6rhombohedralP312a=6.8275 c=20.5619 V=0 Z=38306.091dark grey; ferromagnetic < 63K[Mn(en)3]2(Ge5Te10)orthorhombicP21212a 10.735 b 23.417 c 8.932(Me4N)2Mn[Ge4Te10]Iband gap 0.69 eVNa9Sb[Ge2Te6]2monoclinicC2/ca = 9.541 b = 26.253 c = 7.582β = 122.23° Z = 2dark grey; band gap 1.51 eVCs2GeTe4848.8orthorhombicPnmaa=12.602 b=11.501 c=7.694 Z=41113.85.06Cs6Ge2Te6monoclinicC2/ca = 17.027 b = 14.237 c = 10.104 β = 96.701° Z = 4black; Ge-Ge bondCs2Ge3Ga6Te14P3ma = 8.2475 c = 14.2734 Z = 1840.82Cs2Ge3In6Te14P3ma =8.5404 c = 14.6766 Z = 1927.07β-BaGa2Te4orthorhombicImmaa = 23.813 b = 11.967 c = 6.7215Ba2GeTe3orthorhombicPnmaa = 6.790 b = 23.720 c = 6.930Ba2Ge2Te5orthorhombicPna21a= 13.3879 b= 9.1703 c= 9.9441 Z= 4blackBa5Ga2Ge3Te12monoclinicP21/ca = 13.6540 b = 9.6705 c = 23.1134Ba6In2Ge2Te15monoclinicP21/ca 9.6201 b 13.4225 c 27.585 β 92.469°Ba4Ge2Sb2Te10monoclinicP21/ca = 13.984 b = 13.472 c = 13.569 β = 90.16° Z=4blackTl2GeTe3orthorhombicPnmaa = 8.303 b = 21.514 c = 8.453 Z = 8blackTl2GeTe5
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