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Préparation et Determination Structurale de la Forme Haute Temperature de KH2PO4

✍ Scribed by C. Falah; L. Smiri-Dogguy; A. Driss; T. Jouini

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
563 KB
Volume
141
Category
Article
ISSN
0022-4596

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✦ Synopsis

Crystals of the high-temperature form of potassium dihydrogen phosphate (KH 2 PO 4 (KDP)) have been prepared by a hydrothermal method. The old parameters and space group are rectified and the structure is solved for the first time. It crystallizes in the monoclinic system, space group P2 1 /c (No. 14), a ‫؍‬ 7.4514(7) A s , b ‫؍‬ 14.5582(9) A s , c ‫؍‬ 9.366(7) A s , and ‫؍‬ 127.65(1)°, and Z ‫؍‬ 8. The structure is refined to R ‫؍‬ 0.032 for 1530 independent reflections and compared with the other KDP forms. The distribution of hydrogen atoms over PO 4 tetrahedra and the structural relationship with the various forms of KDP are discussed. The doubling of the b parameter is related to structural features.

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