Influence of Chromium Concentration on the Electron Magnetic Resonance Linewidth of Cr3+ in SrTiO3

被引：1
|
作者：
de Biasi, Ronaldo Sergio [1 ]
Netto Grillo, Maria Lucia [2 ]
机构：
[1] Inst Mil Engn, Secao Engn Mecan & Mat, BR-22290270 Rio De Janeiro, RJ, Brazil
[2] Univ Estado Rio de Janeiro, Inst Fis, BR-20550013 Rio De Janeiro, RJ, Brazil
来源：
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS | 2012年 / 15卷 / 03期
关键词：
ceramics; electron magnetic resonance; strontium titanate; chromium; niobium; SPIN-RESONANCE; STRONTIUM; CERAMICS;
D O I：
10.1590/S1516-14392012005000053
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electron magnetic resonance (EMR) spectra of Cr3+ ions in samples of chromium-doped strontium titanate (SrTiO3) have been studied at room temperature for chromium concentrations between 0.20 and 1.00 mol%. According to previous studies, chromium substitutes Ti4+ sites in the lattice and its preferred valence state is Cr4+, which is EMR silent in the X-band, but the trivalent state can be produced by illumination or codoping with Nb. In the present work, the codoping method was used; the results show the electron magnetic resonance linewidth of the Cr3+ spectrum increases with increasing chromium concentration and that the range of the exchange interaction between Cr3+ ions is about 0.96 nm.
引用
收藏
页码：473 / 476
页数：4
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