Cation ordering in the perovskite-type Sr2-xLaxCo1-yTa1+yO6

Sumio Kato; Tatsuhiro Kawase; Yozo Ohshima; Mikio Sugai; Hirotsugu Takizawa; Tadashi Endo

doi:10.1016/S0925-8388(99)00004-3

Cation ordering in the perovskite-type Sr_2-xLa_xCo_1-yTa_1+yO₆

Sumio Kato, Tatsuhiro Kawase, Yozo Ohshima, Mikio Sugai, Hirotsugu Takizawa, Tadashi Endo

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2 Citations (Scopus)

Abstract

Perovskite-related solid solutions, Sr_2-xLa_xCu_1-yTa_1+yO_z, were synthesized by solid-state reaction at 1200°C in air. The crystalline phases were identified by powder X-ray diffraction. The perovskite-type solid solutions with different ordering types were observed including simple cubic perovskite-type (random), the Ba(Sr_1/3Ta_2/3)O₃-type (1:2 ordering) and the (NH₄)₃FeF₆-type (1:1 ordering). The 1:2 ordering phase formed near the Sr₂(Co_0.67Ta_1.33)O₆ composition. In the composition range, 0≤y≤0.2, the random and the 1:1 ordered phases formed. In the higher La³⁺ content region, the 1:1 ordering phase was observed. The valency state of Co decreased with increasing La³⁺ content and the perovskite cell expanded resulting from the increase of the average ionic radii on (Co,Ta) site The 1:1 ordering of the ions on the octahedral site was found to be affected by the size difference of the ions more than the charge difference in this system.

Original language	English
Pages (from-to)	64-68
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	285
Issue number	1-2 Complete
DOIs	https://doi.org/10.1016/S0925-8388(99)00004-3
Publication status	Published - 1999 Jun 30

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/S0925-8388(99)00004-3

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title = "Cation ordering in the perovskite-type Sr2-xLaxCo1-yTa1+yO6",

abstract = "Perovskite-related solid solutions, Sr2-xLaxCu1-yTa1+yOz, were synthesized by solid-state reaction at 1200°C in air. The crystalline phases were identified by powder X-ray diffraction. The perovskite-type solid solutions with different ordering types were observed including simple cubic perovskite-type (random), the Ba(Sr1/3Ta2/3)O3-type (1:2 ordering) and the (NH4)3FeF6-type (1:1 ordering). The 1:2 ordering phase formed near the Sr2(Co0.67Ta1.33)O6 composition. In the composition range, 0≤y≤0.2, the random and the 1:1 ordered phases formed. In the higher La3+ content region, the 1:1 ordering phase was observed. The valency state of Co decreased with increasing La3+ content and the perovskite cell expanded resulting from the increase of the average ionic radii on (Co,Ta) site The 1:1 ordering of the ions on the octahedral site was found to be affected by the size difference of the ions more than the charge difference in this system.",

author = "Sumio Kato and Tatsuhiro Kawase and Yozo Ohshima and Mikio Sugai and Hirotsugu Takizawa and Tadashi Endo",

year = "1999",

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T1 - Cation ordering in the perovskite-type Sr2-xLaxCo1-yTa1+yO6

AU - Kato, Sumio

AU - Kawase, Tatsuhiro

AU - Ohshima, Yozo

AU - Sugai, Mikio

AU - Takizawa, Hirotsugu

AU - Endo, Tadashi

PY - 1999/6/30

Y1 - 1999/6/30

N2 - Perovskite-related solid solutions, Sr2-xLaxCu1-yTa1+yOz, were synthesized by solid-state reaction at 1200°C in air. The crystalline phases were identified by powder X-ray diffraction. The perovskite-type solid solutions with different ordering types were observed including simple cubic perovskite-type (random), the Ba(Sr1/3Ta2/3)O3-type (1:2 ordering) and the (NH4)3FeF6-type (1:1 ordering). The 1:2 ordering phase formed near the Sr2(Co0.67Ta1.33)O6 composition. In the composition range, 0≤y≤0.2, the random and the 1:1 ordered phases formed. In the higher La3+ content region, the 1:1 ordering phase was observed. The valency state of Co decreased with increasing La3+ content and the perovskite cell expanded resulting from the increase of the average ionic radii on (Co,Ta) site The 1:1 ordering of the ions on the octahedral site was found to be affected by the size difference of the ions more than the charge difference in this system.

AB - Perovskite-related solid solutions, Sr2-xLaxCu1-yTa1+yOz, were synthesized by solid-state reaction at 1200°C in air. The crystalline phases were identified by powder X-ray diffraction. The perovskite-type solid solutions with different ordering types were observed including simple cubic perovskite-type (random), the Ba(Sr1/3Ta2/3)O3-type (1:2 ordering) and the (NH4)3FeF6-type (1:1 ordering). The 1:2 ordering phase formed near the Sr2(Co0.67Ta1.33)O6 composition. In the composition range, 0≤y≤0.2, the random and the 1:1 ordered phases formed. In the higher La3+ content region, the 1:1 ordering phase was observed. The valency state of Co decreased with increasing La3+ content and the perovskite cell expanded resulting from the increase of the average ionic radii on (Co,Ta) site The 1:1 ordering of the ions on the octahedral site was found to be affected by the size difference of the ions more than the charge difference in this system.

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Cation ordering in the perovskite-type Sr_2-xLa_xCo_1-yTa_1+yO₆

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