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A Structural Study of the Mixed Crystal K 0.77 (NH 4 ) 0.23 H 2 PO 4

1991; Physical Society of Japan; Volume: 60; Issue: 2 Linguagem: Inglês

10.1143/jpsj.60.533

1347-4073

Yasuhiro Ono, Noboru Yamada,

Crystallography and molecular interactions

The crystal structure of the mixed crystal K 0.77 (NH 4 ) 0.23 H 2 PO 4 has been investigated at four temperatures between 90 K and 293 K by means of X-ray diffraction with particular interest to the temperature dependence of thermal parameters. It is revealed that thermal parameters U 11 's for K, P and O atoms deviate from the line to be in proportion to absolute temperature around at 110 K. The anomalies in U 11 's are understood as the result of random and static displacements of K, P and O atoms.