Distortion and cation ordering in LaSr(Ni1-xCux)TaO6

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

doi:10.1016/S0925-8388(99)00005-5

Distortion and cation ordering in LaSr(Ni_1-xCu_x)TaO₆

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

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Abstract

The perovskite-type solid solution LaSr(Ni_1-xCu_x)TaO₆ was synthesized and characterized by powder X-ray diffraction and iodometric titration. The stoichiometric solid solutions were synthesized at 1050-1100°C in air. The compounds for 0≤x≤0.6 have the (NH₄)₃FeF₆-type structure with ordering between (Ni²⁺, Cu²⁺) and Ta⁵⁺. Tetragonal distorted (NH₄)₃FeF₆-type phases due to the Jahn-Teller effect formed in the compositional range, x≥0.7 and the monoclinic distortion was observed for x=0.9 and 1.0. This result suggests that the tetragonal distortion occurs when the amount of Cu²⁺ becomes more than 35% of the octahedral site in this system.

Original language	English
Pages (from-to)	69-72
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	285
Issue number	1-2 Complete
DOIs	https://doi.org/10.1016/S0925-8388(99)00005-5
Publication status	Published - 1999 Jun 30

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title = "Distortion and cation ordering in LaSr(Ni1-xCux)TaO6",

abstract = "The perovskite-type solid solution LaSr(Ni1-xCux)TaO6 was synthesized and characterized by powder X-ray diffraction and iodometric titration. The stoichiometric solid solutions were synthesized at 1050-1100°C in air. The compounds for 0≤x≤0.6 have the (NH4)3FeF6-type structure with ordering between (Ni2+, Cu2+) and Ta5+. Tetragonal distorted (NH4)3FeF6-type phases due to the Jahn-Teller effect formed in the compositional range, x≥0.7 and the monoclinic distortion was observed for x=0.9 and 1.0. This result suggests that the tetragonal distortion occurs when the amount of Cu2+ becomes more than 35% of the octahedral site in this system.",

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T1 - Distortion and cation ordering in LaSr(Ni1-xCux)TaO6

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 - The perovskite-type solid solution LaSr(Ni1-xCux)TaO6 was synthesized and characterized by powder X-ray diffraction and iodometric titration. The stoichiometric solid solutions were synthesized at 1050-1100°C in air. The compounds for 0≤x≤0.6 have the (NH4)3FeF6-type structure with ordering between (Ni2+, Cu2+) and Ta5+. Tetragonal distorted (NH4)3FeF6-type phases due to the Jahn-Teller effect formed in the compositional range, x≥0.7 and the monoclinic distortion was observed for x=0.9 and 1.0. This result suggests that the tetragonal distortion occurs when the amount of Cu2+ becomes more than 35% of the octahedral site in this system.

AB - The perovskite-type solid solution LaSr(Ni1-xCux)TaO6 was synthesized and characterized by powder X-ray diffraction and iodometric titration. The stoichiometric solid solutions were synthesized at 1050-1100°C in air. The compounds for 0≤x≤0.6 have the (NH4)3FeF6-type structure with ordering between (Ni2+, Cu2+) and Ta5+. Tetragonal distorted (NH4)3FeF6-type phases due to the Jahn-Teller effect formed in the compositional range, x≥0.7 and the monoclinic distortion was observed for x=0.9 and 1.0. This result suggests that the tetragonal distortion occurs when the amount of Cu2+ becomes more than 35% of the octahedral site in this system.

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JO - Journal of Alloys and Compounds

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ER -

Distortion and cation ordering in LaSr(Ni_1-xCu_x)TaO₆

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