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

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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)69-72
Number of pages4
JournalJournal of Alloys and Compounds
Issue number1-2 Complete
Publication statusPublished - 1999 Jun 30


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