# Tellurogallate

Tellurogallates are chemical compounds which contain anionic units of tellurium connected to gallium. They can be considered as gallates where tellurium substitutes for oxygen. Similar compounds include the thiogallates, selenogallates, telluroaluminates, telluroindates and thiostannates. They are in the category of chalcogenotrielates or more broadly tellurometallates or chalcogenometallates.

## Formation

Tellurogallates may be produced by heating a metal with gallium and tellurium in a sealed tube.

## Properties

Some tellurogallates are semiconductors

## Use

Tellurogallates are primarily of research interest. They are investigated for their infrared, thermoelectric and semiconductor characteristics.

## List

| name | chem | mw | crystal system | space group | unit cell Å | volume | density | comment |
| lithium tellurogallate | LiGaTe$_2$ | 321.86 | tetragonal | I42d | a=6.338 c=11.704 Z=16 | 470.1 | 2.937 | orange to black; band gap 2.41 eV |
| sodium trigallium pentatelluride | NaGa$_3$Te$_5$ | | trigonal | R32 | a=14.58 c=17.761 Z=12 | 3269.5 | 5.272 | black |
| | [(C$_6$H$_5$)$_4$P]GaTe$_2$(en)$_2$ en = ethane-1,2-diamine | | monoclinic | C2/c | a=20.680 b=5.3877 c=27.192 β=19.13° | 3029.6 | 1.720 | orange |
| | KGaTe$_2$ | | monoclinic | C2/c | a=11.768, b=11.775, c=16.503, β=100.36°, Z=16 | | | |
| | KGaTe$_2$ | | triclinic | P1 or P1 | a=8.34 b=8.34 c=64.4 αβγ~90° | 4479.4 | 4.30 | |
| hexapotassium di-μ-telluridobis (ditelluridogallate) | K$_6$Ga$_2$Te$_6$ | | monoclinic | P12$_1$/c1 | a = 8.616, b = 13.685, c = 11.290, β = 127.61°, Ζ = 2 | 1054.6 | | |
| | K[K([18]crown-6)]$_2$[GaTe$_3$] · 2CH$_3$CN | | monoclinic | C2/m | a=24.469 b=14.073 c=12.875 β=94.47 Z=4 | 4369 | 1.784 | yellow (@113K) |
| | CaGa$_6$Te$_{10}$ | | monoclinic | C2 | a=14.40 b=14.40 c=10.21 β=90.0 Z=4 | 2117.1 | | |
| | Cr$_3$(GaTe$_3$)$_2$ | | | | amorphous | | | |
| | MnGa$_2$Te$_4$ | | monoclinic | C2/c | a=11.999, b=11.999, c=24.922, β=104.01°, Z=16 | | | |
| | MnGa$_2$Te$_4$ | | orthorhombic | Pnma | a = 27.448, b = 4.192, c = 6.993 Z=4 | 804.6 | 5.82 | |
| | Fe$_3$(GaTe$_3$)$_2$ | | | | amorphous | | | |
| | Co$_3$(GaTe$_3$)$_2$ | | | | amorphous | | | |
| | Ni$_{3−x}$GaTe$_2$ | | | P6$_3$/mmc | a=3.9393 c=15.7933 Z=2 | | | |
| | Ni$_2$FeGaTe | | | P6$_3$/mmc | a=3.962 c=15.868 Z=2 | 215.7 | | |
| | CuGaTe$_2$ | | | I42d | a = 6.02348, c = 11.93979 | 433.2 | | |
| | ZnGa$_2$Te$_4$ | | | I4 | a=5.930, c=11.859 Z=2 | | 5.7 | |
| | ZnGa$_2$Te$_4$ | | tetragonal | I42m | a=6.922 c=11.809 | | | |
| | ZnGa$_2$Te$_4$ | | | F43m | a=5.843 Z=1/2 | | | |
| | AgGaTe$_2$ | | | I42d | a=6.320 c=11.986 Z=2 | | 6.052 | melt 725.7 °C; heat of fusion= 104.8 J/g$^{−1}$ |
| | AgGa$_5$Te$_8$ | | tetragonal | I4$_1$/a | a=8.415 c=47.877 | | | |
| | Ag$_2$Ga$_6$Te$_{10}$ | | | | | | | |
| | Ag$_9$GaTe$_6$ | | hexagonal | | | | | melt 710 °C Low thermal conductivity |
| | CdGa$_2$Te$_4$ | | tetragonal | | a=5.742 c=10.730 | | | |
| | InGaTe$_2$ | | tetragonal | I4/mcm | a = 8.412, c = 6.875; Z = 4; | | | |
| | In$_2$Ga$_6$Te$_{10}$ | | trigonal | R32 | a=10.34 alpha=89.7 Z=12 | | 5.78 | |
| | SnGa$_6$Te$_{10}$ | | trigonal | P3121/6 | a=14.408 c=17.678 Z=6 | 3178 | 5.684 | black |
| | Sn$_x$Ga$_{1-x}$Te x=1/2 | | cubic | | a=6.315 | 251.84 | | |
| | β-BaGa$_2$Te$_4$ | | orthorhombic | Imma | a = 23.813, b = 11.967, c = 6.7215 | | | |
| | Ba$_5$Ga$_2$Ge$_3$Te$_{12}$ | | monoclinic | P2$_1$/c | a = 13.6540, b = 9.6705, and c = 23.1134 β =91.829 | | | |
| | LaGa$^I$Te$_2$ | | orthorhombic | Pmc2$_1$ | | | | |
| | CeGa$^I$Te$_2$ | | orthorhombic | Pmc2$_1$ | | | | |
| | PrGa$^I$Te$_2$ | | orthorhombic | Pmc2$_1$ | | | | |
| | NdGa$^I$Te$_2$ | | orthorhombic | Pmc2$_1$ | | | | |
| | Eu$_{0.81}$Ga$_2$Te$_4$ | | tetragonal | I4/mcm | a = 8.2880, c = 6.744, Z = 2 | 463.24 | | |
| | HgGa$_2$Te$_4$ | | cubic | F43m | a=6.002 Z=1 | 216.22 | | |
| | HgGa$_2$Te$_4$ | | tetragonal | I42m | a=6.025 c=12.037 Z=2 | 436.95 | | black |
| | TlGaTe$_2$ | | tetragonal | I4/mmm D$^{18}$$_{4h}$ | a=8.429 c=6.865 | | | band gap 0.84 eV |
| | Tl$_2$InGaTe$_4$ | | tetragonal | I4mcm | | | | |
| | PbGa$_6$Te$_{10}$ | | trigonal | P3$_2$21/6 | a=14.465 c=17.718 Z=6 | 3210 | 5.898 | black |