Synthesis and conductivity of Yb2Ti2O7 nanoceramics

被引：31

作者：

Shlyakhtina, AV

Abrantes, JCC

Larina, LL

Shcherbakova, LG

机构：

[1] RAS, Semenov Inst Chem Phys, Moscow 119991, Russia

[2] Polytech Inst Viana Castelo, ESTG, P-4900 Viana Do Castelo, Portugal

[3] RAS, Emanuel Inst Biochem Phys, Moscow 117901, Russia

来源：

SOLID STATE IONICS | 2005年 / 176卷 / 17-18期

基金：

俄罗斯基础研究基金会;

关键词：

ytterbium titanate; co-precipitation; freeze drying; pyrochlore; fluorite; order-disorder transformation; nanocrystalline ceramics;

D O I：

10.1016/j.ssi.2005.04.038

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 ordering processes in Yb2Ti2O7 ceramics are studied by thermal analysis, IR spectroscopy, X-ray diffraction, SEM and electrical conductivity measurements. Yb2Ti2O7 was obtained by a co-precipitation method followed by freeze drying and thermal annealing at 3501670 degrees C. The existence of the fluorite-pyrochlore low-temperature transition near 800 degrees C and the pyrochlore-fluorite high-temperature transition near 1700 degrees C was established. The conductivity of Yb2Ti2O7 sintered at 1670 degrees C seems to be ionic in the range of 300-950 degrees C, with a bulk activation energy of 0.81 eV. Yb2Ti2O7 ceramics had a grain size of about 30 nm over a wide range of sintering temperatures (1400-1670 degrees C). (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：1653 / 1656

页数：4

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