Influence of chromium concentration on the electron magnetic resonance linewidth of Cr3+ in SrTiO3

Materials Research

Ronaldo Sergio De Biasi²  Maria Lúcia Netto Grillo¹ 

[1] ,Instituto Militar de Engenharia Seção de Engenharia Mecânica e de Materiais Rio de Janeiro RJ ,Brazil

关键词: ceramics;    electron magnetic resonance;    strontium titanate;    chromium;    niobium;   

DOI  :  10.1590/S1516-14392012005000053

来源: SciELO

【 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.

【 授权许可】

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