SYNTHESIS AND CRYSTAL-STRUCTURE OF POTASSIUM AND SODIUM VANADIUM PHOSPHATES

被引：14

作者：

KORTHUIS, VC ^{[1
]}

HOFFMANN, RD ^{[1
]}

HUANG, JF ^{[1
]}

SLEIGHT, AW ^{[1
]}

机构：

[1] OREGON STATE UNIV,DEPT CHEM,CORVALLIS,OR 97331

来源：

CHEMISTRY OF MATERIALS | 1993年 / 5卷 / 02期

关键词：

D O I：

10.1021/cm00026a009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The isomorphic crystal structures of K2VPO6 and Na2VPO6 were determined from single-crystal X-ray diffraction data. The two compounds crystallize in the monoclinic space group P2(1)/n with four formula units per unit cell. For K2VPO6, a = 6.863 (2) angstrom, b = 13.479 (5) angstrom, c = 7.505 (1) angstrom, beta = 111.02 (1)-degrees, V = 648.0 (3) angstrom3, R = 0.046, and R(w) = 0.071. For Na2VPO6, a = 6.1805 (7) angstrom, b = 12.436 (1) angstrom, c = 7.386 (1) angstrom, beta = 107.00 (1)-degrees, V = 542.9 angstrom3, R = 0.030, and R(w) = 0.046. The compounds may be described as infinite helical chains of vanadium, phosphorous, and oxygen running perpendicular to the 101 plane. Between these chains, there are two crystallographically distinct sites for the alkali cations, but both sites may be described as highly irregular 6-fold coordination. The potassium compound melts at 480-degrees-C, and the sodium compound melts at 466-degrees-C.

引用

页码：206 / 209

页数：4

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