X-ray absorption fine structure studies of Mn coordination in doped perovskite SrTiO3

被引：52

作者：

Levin, I. ^{[1
]}

Krayzman, V. ^{[1
]}

Woicik, J. C. ^{[1
]}

Tkach, A. ^{[2
]}

Vilarinho, P. M. ^{[2
]}

机构：

[1] Natl Inst Stand & Technol, Div Ceram, Gaithersburg, MD 20899 USA

[2] Univ Aveiro, Dept Ceram & Glass Engn, CICECO, P-3810193 Aveiro, Portugal

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 05期

关键词：

bond lengths; ceramics; crystal binding; doping; EXAFS; manganese; segregation; strontium compounds; STRONTIUM-TITANATE CERAMICS; SPECTRA;

D O I：

10.1063/1.3298369

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The coordination of Mn in doped SrTiO3 ceramics having nominal compositions SrTi0.98Mn0.02O3 and Sr0.98Mn0.02TiO3 was analyzed using x-ray absorption fine structure (XAFS) measurements. As expected, Mn4+ substitution for Ti4+ leads to Mn occupancy of the octahedral B-sites of ABO(3) perovskite lattice with a Mn-O bond distance of 1.902 A degrees (compared to 1.953 A degrees for Ti-O) and no significant local distortions around the Mn atoms. In contrast, for the composition Sr0.98Mn0.02TiO3, Mn segregates to both the A-sites (as Mn2+) and the B-sites (predominantly as Mn4+). Extended XAFS confirms strong (approximate to 0.77 A degrees) displacements of Mn2+ cations off the ideal A-site positions along << 001 >> directions with a significant distortion of several coordination shells around the dopant atoms.

引用

页数：3

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