High-temperature phase transition in lanthanum titanate perovskite La0.64(Ti0.92,Nb0.08)O3

Masatomo Yashima, Mizuki Mori, Takashi Kamiyama, Ken Ichi Oikawa, Akinori Hoshikawa, Shuki Torii, Koh Saitoh, Kenji Tsuda

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19 Citations (Scopus)


High-temperature phase transition of lanthanum niobium titanate La0.64(Ti0.92,Nb0.08)O3 has been studied using neutron powder diffraction and the Rietveld method. The material is orthorhombic ( Cmmm ) between 295 and 534 K, while it is tetragonal (P4/mmm) between 637 and 740 K. The anti-phase tilt along the b axis of the oxygen octahedron around Ti and Nb atoms was found to induce the tetragonal-to-orthorhombic phase transition. The angle of the tilt and the b/a ratio of cell parameters decrease with an increase of temperature and become 0° and unity, respectively, at a transition temperature between 534 and 637 K.

Original languageEnglish
Pages (from-to)240-246
Number of pages7
JournalChemical Physics Letters
Issue number1-2
Publication statusPublished - 2003 Jun 25


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