CRYSTAL-CHEMISTRY OF ANION-EXCESS REO3-RELATED PHASES .2. CRYSTAL-STRUCTURE OF PRZR2F11

被引:29
作者
LAVAL, JP
ABAOUZ, A
机构
[1] Laboratoire de Céramiques Nouvelles-U.R.A.-C.N.R.S. No. 320, Université de Limoges, 87060 Limoges Cedex, 123, Avenue A. Thomas
关键词
D O I
10.1016/0022-4596(92)90158-R
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A series of rare-earth fluorozirconates LnZr2F11 (Ln = La, Ce, Pr, Nd) was prepared by solid-state reaction of the binary fluorides and indexed on the basis of single-crystal data. PrZr2F11 crystal structure was determined (R = 0.031) from data recorded on a four-circle automatic diffractometer in the Ibam space group, with cell parameters a = 7.716(4) Å, b = 10.006(6)Å, and c = 10.897(6) Å. This structure results from the stacking of alternate single sheets of corner-shared [ZrF7]3- monocapped trigonal prisms and of [PrF8]5- square antiprisms. PrZr2F11 structure is closely related to monoclinic β-ZrF4 type by ordered anionic insertion transforming [ZrF7]3- monocapped trigonal prisms to [ZrF8]4- square antiprisms. It also derives from ReO3 type by a mechanism involving cationic and anionic insertion through a cationic plane net transformation from square 44 plane nets to semiregular 32.4.3.4. ones. Owing to the presence of LaZr2F11 after recrystallization of various fluoride glasses, the description of the cationic subnetwork and of the anionic connections inside this new kind of structure is especially developed in order to give a basis for subsequent investigations of fluoride glass structures. © 1992.
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页码:90 / 100
页数:11
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