Yttrium pyrogermanate,Y2Ge2O7 |
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Authors: | Günther J Redhammer Georg Roth Georg Amthauer |
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Abstract: | The structure of diyttrium digermanate, Y2Ge2O7, has been determined in the tetragonal space group P43212. It contains one Y, one Ge (both site symmetry 1 on general position 8b) and four O atoms one on special position 4a (site symmetry ..2) and the remaining three on general positions 8b]. The basic units of the structure are isolated Ge2O7 groups, sharing one common O atom and displaying a Ge—O—Ge angle of 134.9 (3)°, and infinite helical chains of pentagonal YO7 dipyramids, parallel to the 43 screw axis. The crystal investigated here represents the left‐handed form of the tetragonal R2Ge2O7 compounds (R = Eu3+, Tb3+, Er3+, Tm3+ and Lu3+). |
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