A new hexagonal 12-layer perovskite-related structure:: Ba6R2Ti4O17 (R = Nd and Y)

被引：31

作者：

Kuang, XJ

Jing, XP ^{[1
]}

Loong, CK

Lachowski, EE

Skakle, JMS

West, AR

机构：

[1] Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Appicat, Beijing 100871, Peoples R China

[2] Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA

[3] Univ Aberdeen, Dept Chem, Aberdeen AB24 3UE, Scotland

[4] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England

来源：

CHEMISTRY OF MATERIALS | 2002年 / 14卷 / 10期

关键词：

D O I：

10.1021/cm020374m

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 crystal structure of Ba6R2Ti4O17 (R = Nd and Y) was determined by combined analysis of X-ray and neutron powder diffraction data. Both materials crystallize in hexagonal symmetry with space group P6(3)/mmc, Z = 2. The unit cell parameters at room temperature are a = 5.99283(9) Angstrom and c = 29.9289(8) Angstrom for Nd and a = 5.93055(4) Angstrom and c = 29.5239(3) Angstrom for Y. The structure can be described as stacking of cubic (c) and hexagonal (h) [BaO3] layers as well as ordered, oxygen-deficient, pseudo-cubic (c') [BaO2] layers in the sequence of (c'cchcc)(2) along the c-axis and belongs to the 12-layer hexagonal perovskite-related family. The structural framework exhibits face-sharing TiO6 octahedral layers (Ti2O9), RO6 octahedral layers, and TiO4 tetrahedral layers. The TiO4 subunits form around the c' layers.

引用

页码：4359 / 4363

页数：5

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