Dresden 2026 – wissenschaftliches Programm
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FM: Fachverband Funktionsmaterialien
FM 22: Focus Session: Materials Discovery III – New materials and functionalities by general principles
FM 22.8: Vortrag
Freitag, 13. März 2026, 11:45–12:00, BEY/0138
Triclinic distortion in titanite-type oxides CaSnGeO5 and SrSnGeO5 — •Taro Kuwano1, Hiroko Yokota1, Manabu Hagiwara2, Toshiya Uohashi3, Akitoshi Nakano3, and Hiroki Taniguchi3 — 14259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa, 226-8501 Japan — 23-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa, 223-8522 Japan — 3Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8602 Japan
Titanite-family oxides have been emerging as a novel vein of antiferroelectric materials owing to their unique pseudo-one-dimensional structure hosting "antipolar arrangement of polar chains." In this study, we focus on another characteristic feature of the titanite-type structure: ferroelastic phase transition associated with triclinic distortion. We will propose one couple of representatives, SrSnGeO5 and CaSnGeO5, which exhibit the phase transition at about 150 and 600 K, repectively. In comparison with the cases of SrZrGeO5 and CaZrGeO5, the origin of the triclinc distortion will be discussed.
Keywords: titanite; ferroelastic; triclinic