EXAFS Studies of Ruthenium Based Double Perovskite ALaMnRuO₆ (A = Ca, Sr, Ba)

Rubina Shaheen, Javaid Bashir, Muhammad Nasir Khan

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DOI: 10.4236/msa.2012.31004                

Abstract

Room and liquid nitrogen temperatures Mn K-edge extended X-ray fine structure (EXAFS) studies were carried out on powder samples of ALaMnRuO₆ (A = Ca, Sr, Ba) perovskites. The EXAFS analysis of Mn K-edge spectra showed MnO6 octahedra are distorted. Among the three perovskites, the polyhedral distortion is highest for SrLaMnRuO₆ (Δ = 1.4 × 10^–3). For CaLaMnRuO6 (Δ = 0.5 × 10^–3) and BaLaMnRuO6, (Δ = 0.7 × 10–3), the smaller values of distortion parameters indicate that the MnO₆ octahedra are relatively regular and undistorted in the latter two systems. In SrLaMnRuO₆, MnO₆ distortion appears to be of orthorhombic (Q₂) type whereas for CaLaMnRuO₆ and BaLaMnRuO₆, the distortion is of tetragonal or Q₃ type. The Mn-O distances as determined from the EXAFS measurements, increases with the increase in the size of the divalent cation. No structural changes occurred in the local environment around Mn atom when the temperature was lowered from room to liquid nitrogen temperature.

Keywords

A. Oxides; A. Ceramics; C. EXAFS; D. Crystal Structure

Conflicts of Interest

The authors declare no conflicts of interest.

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