New scheelite-type oxynitrides in systems RWO3N-AWO4 (R = rare-earth element; A = Ca, Sr) from precursors obtained by the citrate route

被引：17

作者：

Cheviré, F ^{[1
]}

Tessier, F ^{[1
]}

Marchand, R ^{[1
]}

机构：

[1] Univ Rennes 1, Inst Chim Rennes, CNRS, UMR 6512, F-35042 Rennes, France

来源：

MATERIALS RESEARCH BULLETIN | 2004年 / 39卷 / 7-8期

关键词：

nitrides; chemical synthesis; neutron scattering; crystal structure;

D O I：

10.1016/j.materresbull.2004.02.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

RWO3N oxynitrides were isolated as single phases for R = Nd and Pr, after thermal ammonolysis of reactive precursors prepared using the citrate complexation/calcination route. Both stoichiometric compounds crystallize with a scheelite-type tetragonal unit cell, with a = 5.2821(3) Angstrom, c = 11.5893 (8) Angstrom (NdWO3N) and a = 5.299(3) Angstrom, c = 11.631(9) Angstrom (PrWO3N). Neutron diffraction experiments performed on the Nd-phase did not evidence any oxygen/nitrogen order within the scheelite anionic subnetwork (space group: I4(1)/a). (Nd,A)W(O,N)(4) (A = Ca, Sr) solid solution domains were identified between NdWO3N and the AWO(4) oxide composition. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：1091 / 1101

页数：11

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