THE HIGH-RESOLUTION CRYSTAL-STRUCTURE OF POTASSIUM AMMONIUM DIHYDROGEN PHOSPHATE MIXED-CRYSTALS - K0.11(NH4)0.89H2PO4 AT 154-K, 164-K, 192-K AND 295-K

被引:11
作者
BOUKHRIS, A
LECOMTE, C
WYNCKE, B
BREHAT, F
THALAL, A
机构
[1] UNIV NANCY 1,FAC SCI,MINERAL CRISTALLOG & PHYS INFRAROUGE LAB,CNRS,URA 809,BP 239,F-54506 VANDOEUVRE NANCY,FRANCE
[2] FAC SCI AGADIR,DEPT PHYS,AGADIR,MOROCCO
[3] UNIV CADI AYYAD,DEPT PHYS,MARRAKECH,MOROCCO
关键词
D O I
10.1088/0953-8984/6/13/009
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The x-ray crystal structure of a mixed crystal of potassium dihydrogen phosphate (KDP) and ammonium dihydrogen phosphate (ADP), K1-x(NH4)XH2PO4 (KADPX) With X = 0.89, has been refined in the paraelectric phase at 154, 164, 192 and 295 K, against high-resolution data (((sin theta)/lambda)max congruent-to 1.2 angstrom-1) with multipolar pseudoatom form factors. The phase transition temperature is observed to lie at T(c) = 132 +/- 1 K; a linear temperature dependence of the atomic vibration amplitudes of P and O is observed; extrapolation of U33 curves to T = 0 K suggests a distribution of P between two sites separated by 0.2 angstrom. The structure of KADP0.89 is compared with ADP and KDP structural data.
引用
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页码:2475 / 2490
页数:16
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