Phosphidogermanates are chemical compounds that have phosphorus bound to germanium to yield anions. They are in the category of phosphidotetrelates and also pnictides. They are analogous to nitridogermanates, phosphidoaluminates, phosphidogallates, phosphidoindates, phosphidosilicates or phosphidostannates.
They are under investigation as infrared non-linear optic materials and solid-state electrolytes.
List formulaMWcrystal systemspace groupunit cell ÅvolumedensityformpropertiesreferencesGePmonoclinicC2/ma = 15.1948 b = 3.6337 c = 9.1941 β = 101.239°Li2GeP2148.458tetragonalI41/acda = 12.3069 c = 19.0306 Z=322882.422.736Ge4P10 supratetrahedraredLiGe3P3317.751orthorhombicPbama = 9.8459 b = 15.7489 c = 3.5995 Z=4558.153.780GeP4 and Ge(P3Ge) tetrahedra in 5 and 6-membered rings making 2D slabsblackLi8GeP4252Paa=11.80203 c=11.80203 Z=81643.882.037Li8GeP4251.99cubicP3na=11.77294 Z=81635.982.046Li14GeP6cubicFmma=5.95667 Z=41.860brownLi10.1Ge5PPnmaa=10.360 b=4.3072 c=24.267 Z=41082.82.86Ge5 ringsblack; actually is a germanide phosphideNaGe3P3orthorhombicPmc21a=3.6276 b=8.407 c=10.332 Z=2315.093.517Ge3P7 ringred; band gap 2.06 eV; semiconductorNa2Ge3P3356.72monoclinicC2/ma = 17.639 b = 3.6176 c = 11.354 β = 92.74° Z=4723.73.274blackNa3Ge2P3307.06monoclinicP21/ca = 7.2894 b = 14.7725 c = 7.0528 β = 106.331° Z=4728.82.798Ge2P6 with shared PblackNa5Ge7P5monoclinicC2/ma = 16.168 b = 3.6776 c = 12.924 β = 91.30° Z=2768.23.343blackNa8GeP4380.4cubicFdma=13.4230 Z=82418.532.08943same as Na8SnSb4black; decomposes over 350 °C to Na10Ge2P6;band gap 1.9 eVNa10Ge2P6monoclinicP21/na=13.176 b =7.36.4 c=8.042 β=90.26° Z=2780.292.38beige; moisture sensitiveCuGe2P3ZnGeP2I2da=5.466 c=10.722melt 1027 °CAg6Ge10P121744.76cubicI3ma=10.3111 Z=21096.35.286air stable; silver grey; thermoelectricCdGeP2I2da=5.740 c=10.773Cs5GeP3orthorhombicPnmaa=14.31 b=5.994 c=15.618 Z=4metallicBaGe2P2344.46tetragonalP42mca =7.6153 c =8.490 Z=4492.34.647light metallic grey; melt 861 °CBaGe7P12Ra=12.6309 c =9.2472 Z=31277.73.967Ge2P6 P-P
References