Synthesis and crystal structure of Sr2-xLaxCuTaOy

Sumio Kato; Tsuyoshi Makita; Mikio Sugai; Yozo Ohshima; Hirotsugu Takizawa; Tadashi Endo

doi:10.1016/S0925-8388(96)02371-7

Synthesis and crystal structure of Sr_2-xLa_xCuTaO_y

Sumio Kato, Tsuyoshi Makita, Mikio Sugai, Yozo Ohshima, Hirotsugu Takizawa, Tadashi Endo

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Abstract

Perovskite related solid solutions Sr_2-xLa_xCuTaO_y (0 ≤ x ≤ 1.0) were synthesized by solid state reaction at 1050°C in air. Two types of crystal structure were observed in the Sr_2-xLa_xCuTaO_y system: simple cubic perovskite-type (0 ≤ x ≤ 0.7) and tetragonally distorted (NH₄)₃FeF₆-type (0.8 ≤ x ≤ 1.0). The average valency state of copper in these solid solutions was nearly equal to + 2, which was determined by iodometric titration. A significant change of the cubic lattice parameter a was not observed, and the tetragonality (c/a) increased with increasing La³⁺ content. An ordering of Cu²⁺ and Ta⁵⁺ on the B site and the tetragonal distortion are found to be related to the appearance of the Jahn-Teller effect of Cu²⁺.

Original language	English
Pages (from-to)	36-38
Number of pages	3
Journal	Journal of Alloys and Compounds
Volume	243
Issue number	1-2
DOIs	https://doi.org/10.1016/S0925-8388(96)02371-7
Publication status	Published - 1996 Oct 15

Keywords

Cation ordering
Jahn-Teller distortion
Perovskite

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/S0925-8388(96)02371-7

Cite this

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title = "Synthesis and crystal structure of Sr2-xLaxCuTaOy",

abstract = "Perovskite related solid solutions Sr2-xLaxCuTaOy (0 ≤ x ≤ 1.0) were synthesized by solid state reaction at 1050°C in air. Two types of crystal structure were observed in the Sr2-xLaxCuTaOy system: simple cubic perovskite-type (0 ≤ x ≤ 0.7) and tetragonally distorted (NH4)3FeF6-type (0.8 ≤ x ≤ 1.0). The average valency state of copper in these solid solutions was nearly equal to + 2, which was determined by iodometric titration. A significant change of the cubic lattice parameter a was not observed, and the tetragonality (c/a) increased with increasing La3+ content. An ordering of Cu2+ and Ta5+ on the B site and the tetragonal distortion are found to be related to the appearance of the Jahn-Teller effect of Cu2+.",

keywords = "Cation ordering, Jahn-Teller distortion, Perovskite",

author = "Sumio Kato and Tsuyoshi Makita and Mikio Sugai and Yozo Ohshima and Hirotsugu Takizawa and Tadashi Endo",

year = "1996",

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doi = "10.1016/S0925-8388(96)02371-7",

language = "English",

volume = "243",

pages = "36--38",

journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Synthesis and crystal structure of Sr2-xLaxCuTaOy

AU - Kato, Sumio

AU - Makita, Tsuyoshi

AU - Sugai, Mikio

AU - Ohshima, Yozo

AU - Takizawa, Hirotsugu

AU - Endo, Tadashi

PY - 1996/10/15

Y1 - 1996/10/15

N2 - Perovskite related solid solutions Sr2-xLaxCuTaOy (0 ≤ x ≤ 1.0) were synthesized by solid state reaction at 1050°C in air. Two types of crystal structure were observed in the Sr2-xLaxCuTaOy system: simple cubic perovskite-type (0 ≤ x ≤ 0.7) and tetragonally distorted (NH4)3FeF6-type (0.8 ≤ x ≤ 1.0). The average valency state of copper in these solid solutions was nearly equal to + 2, which was determined by iodometric titration. A significant change of the cubic lattice parameter a was not observed, and the tetragonality (c/a) increased with increasing La3+ content. An ordering of Cu2+ and Ta5+ on the B site and the tetragonal distortion are found to be related to the appearance of the Jahn-Teller effect of Cu2+.

AB - Perovskite related solid solutions Sr2-xLaxCuTaOy (0 ≤ x ≤ 1.0) were synthesized by solid state reaction at 1050°C in air. Two types of crystal structure were observed in the Sr2-xLaxCuTaOy system: simple cubic perovskite-type (0 ≤ x ≤ 0.7) and tetragonally distorted (NH4)3FeF6-type (0.8 ≤ x ≤ 1.0). The average valency state of copper in these solid solutions was nearly equal to + 2, which was determined by iodometric titration. A significant change of the cubic lattice parameter a was not observed, and the tetragonality (c/a) increased with increasing La3+ content. An ordering of Cu2+ and Ta5+ on the B site and the tetragonal distortion are found to be related to the appearance of the Jahn-Teller effect of Cu2+.

KW - Cation ordering

KW - Jahn-Teller distortion

KW - Perovskite

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