Individual Ge-O bond lengths of 24 germanate tetrahedra in solid materials are observed to increase with decreasing 3, the average of the three O-Ge-O angles common to each bond, and with 1/cos(Ge-O-Ge). These correlations are examined in terms of valence electron population analyses obtained from extended Huckel molecular orbital theory.
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Hill et al. (1977) studied this question.