Synthesis, structure, and resistivity properties of K1 - xBaxNbO3 (0.2 ≤ x ≤ 0.5) and K0.5Sr0.5NbO3

E. M. Kopnin, S. Ya Istomin, O. G. D'yachenko, E. V. Antipov, P. Bordet, J. J. Capponi, C. Chaillout, M. Marezio, S. de Brion, B. Souletie

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Abstract

The K1 - xBaxNbO3 (0.2≤x≤0.5), BaNbO3 and k0.5Sr0.5NbO3 compounds have been synthesized by high-pressure high-temperature technique in a Belt-type apparatus. The synthesis of the K-containing phases carried out in evacuated sealed silica tubes led to the preparation of polyphasic samples. The phases obtained have an ideal perovskite-like structure. The a parameter of Ba-containing compounds increases concomitantly with increasing Ba concentration. Studies of the K-containing phases by X-ray powder diffraction did not reveal any distortion from cubic symmetry. Electron Dispersive Spectroscopy (EDS)-analysis confirmed the cation nominal stoichiometry. Resistivity measurements showed semiconducting-like type of conductivity for the K1 - xBaxNbO3 (0.2≤x≤0.5) and k0.5Sr0.5NbO3 samples, but the relative increase of ρ{variant} with the decrease of temperature became smaller for the phases with lower Nb valence, and moreover K0.5Sr0.5NbO3 exhibited a slight decrease of the resistivity in the 100-4.2 K temperature range. On the contrary, BaNbO3 after high-pressure treatment showed a metallic-like behaviour down to 4.2 K.

Original languageEnglish
Pages (from-to)1379-1386
Number of pages8
JournalMaterials Research Bulletin
Volume30
Issue number11
DOIs
Publication statusPublished - Nov 1995
Externally publishedYes

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