COMPARATIVE STRUCTURAL STUDY OF MIXED METALS PYROPHOSPHATES

被引:32
作者
BELKOUCH, J
MONCEAUX, L
BORDES, E
COURTINE, P
机构
[1] De ́partement de Ge ́nie Chimique, Universite ́de Technologie de Compie`gne, B.P. 649
关键词
DIPHOSPHATES; PYROPHOSPHATES;
D O I
10.1016/0025-5408(94)00128-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Structural properties of A(I)M(III)P2O7-type diphosphates are compared. All compounds were prepared by a ''wet'' method. A comparative study of the three structural forms i.e. NaFeP2O7-I type (low temperature form), NaFeP2O7-II type (high temperature form) and LiFeP2O7 (structure III), is reported. X-ray diffraction and IR spectroscopy turn out to be the simplest methods to characterize the three structural families. Linear correlations between specific unit cell volume and the volume of cations as (r(A)I)3 and (r(M)III)3 are shown to depend on the type of structure and on the nature of the trivalent ion.
引用
收藏
页码:149 / 160
页数:12
相关论文
共 27 条
[21]  
NORD AG, 1980, CHEM SCRIPTA, V15, P27
[22]  
RIOU D, 1988, EUR J SOL STATE INOR, V25, P215
[23]  
RIOU D, 1982, MAT RES B, V25, P1363
[24]   EFFECTIVE IONIC RADII IN OXIDES AND FLUORIDES [J].
SHANNON, RD ;
PREWITT, CT .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL CRYSTALLOGRAPHY AND CRYSTAL CHEMISTRY, 1969, B 25 :925-&
[25]   REVISED EFFECTIVE IONIC-RADII AND SYSTEMATIC STUDIES OF INTERATOMIC DISTANCES IN HALIDES AND CHALCOGENIDES [J].
SHANNON, RD .
ACTA CRYSTALLOGRAPHICA SECTION A, 1976, 32 (SEP1) :751-767
[26]   STRUCTURE OF CSVP2O7 [J].
WANG, YP ;
LII, KH .
ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, 1989, 45 :1210-1211
[27]   STRUCTURE OF NAVP2O7 [J].
WANG, YP ;
LII, KH ;
WANG, SL .
ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, 1989, 45 :1417-1418