Tetrahedral bond length and angle variations in germanates

Abstract

Individual Ge-O bond lengths of 24 germanate tetrahedra in solid materials are observed to increase with decreasing <O-Ge-O>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.