Synthesis, structural characterization, and magnetic properties of NaRE9(GeO4)6O2 (RE=Nd, Pr)

被引：20

作者：

Emirdag-Eanes, M ^{[1
]}

Pennington, WT ^{[1
]}

Kolis, JW ^{[1
]}

机构：

[1] Clemson Univ, Hunter Res Lab, Dept Chem, Clemson, SC 29634 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 366卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

hydrothermal; crystal structure; germanate; oxyapatite; rare earths;

D O I：

10.1016/S0925-8388(03)00725-4

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 new compounds NaRE9(GeO4)(6)O-2 (RE = Nd, Pr) have been synthesized at 500 and 524 degreesC, respectively, via the hydrothermal method. The compounds crystallize with an oxyapatite structure in the hexagonal space group P6(3)/m with one formula unit in a cell of dimensions a = 9.782(1) Angstrom, c = 7.083(1) Angstrom (T = 293 K), V = 587.0(2) Angstrom(3) for RE = Nd and a = 9.802(1) Angstrom, c = 7.116(1) Angstrom (T = 293 K), V = 592.1(2) Angstrom(3) for RE = Pr. Each structure is composed of REO7 and REO9 polyhedra as well as GeO4 tetrahedra. The magnetic susceptibility data indicates paramagnetic behavior for both compounds at temperatures between 60-300 K for Nd and 2-300 K for Pr with a Weiss constant of theta = 44.8 and 33.5 K for Nd and Pr, respectively. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：76 / 80

页数：5

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