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Structure and spectroscopic properties of (AA′)(BB′)O3 mixed-perovskite crystals

Published online by Cambridge University Press:  01 December 2005

Dorota A. Pawlak ,
Masahiko Ito ,
Lukasz Dobrzycki ,
Krzysztof Wozniak ,
Masaoki Oku ,
Kiyoshi Shimamura  and
Tsuguo Fukuda
Dorota A. Pawlak*
Affiliation:
Institute of Electronic Materials Technology, 01-919 Warszawa, Poland
Masahiko Ito
Affiliation:
Physical Chemistry of Luminescent Materials, Claude Bernard/Lyon University, CNRS UMR 5620, Villeurbanne, Cedex 69622, France
Lukasz Dobrzycki
Affiliation:
Warsaw University, Chemistry Department, 02-093 Warszawa, Poland
Krzysztof Wozniak
Affiliation:
Warsaw University, Chemistry Department, 02-093 Warszawa, Poland
Masaoki Oku
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Kiyoshi Shimamura
Affiliation:
Advanced Materials Laboratory National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan
Tsuguo Fukuda
Affiliation:
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
*
a)Address all correspondence to this author. e-mail: Dorota.Pawlak@itme.edu.pl
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Abstract

Five different mixed-perovskite (AA′)(BB′)O3 single crystals were grown, where A = La, Nd; A′ = Sr; B = Al, Ga; and B′ = Ta, Nb. The as-grown crystals were yellowish/brownish. After annealing in air, the coloration was more intense. Annealing in a reducing atmosphere decreased coloration. The crystals were investigated by transmission spectroscopy, electron spectroscopy for chemical analysis (ESCA), and single-crystal x-ray diffraction. Additional broad absorption bands in the transmission spectra were observed for the as-grown samples. They are in line with the changes of the shape of O(1s) ESCA peaks. Redundant interstitial oxygen ions were recognized as the reason for the crystal coloration. All structures were solved and refined in different space groups of the regular system. Some of the unit cells have a doubled lattice constant: (i) lanthanum strontium gallium niobate, Pm3m, 3.9323(5) Å, at 100 K, 3.9270(5) Å; (ii) neodymium strontium aluminum tantalate, Pm3m, 3.8353(4) Å; (iii) lanthanum strontium aluminum tantalate, Pn3m, 7.720(1) Å, annealed in reducing atmosphere, 7.708(1) Å; (iv) neodymium strontium aluminum niobate, Fm3m, 7.744(4) Å.

Keywords

Crystal growthX-ray diffraction (XRD)X-ray photoelectron spectroscopy (XPS)

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Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 12 , December 2005 , pp. 3329 - 3337
Copyright
Copyright © Materials Research Society 2005

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