Structural study of the ferroelectric to paraelectric phase transition in TlTiOPO{sub 4}

Journal Article · Wed Nov 01 00:00:00 EST 1995 · Materials Research Bulletin

DOI:https://doi.org/10.1016/0025-5408(95)00145-X· OSTI ID:137038

Harrison, W T.A. ^[1]; Gier, T E; Stucky, G D ^[2]; Schultz, A J ^[3]

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1. Univ. of Houston, TX (United States). Dept. of Chemistry
2. Univ. of California, Santa Barbara, CA (United States). Dept. of Chemistry
3. Argonne National Lab., IL (United States). Chemistry and Materials Science Division

The crystal structures of thallium titanyl phosphate, TlTiOPO{sub 4}, have been determined at room temperature, at 500 C, and at 650 C, by using time-of-flight neutron single crystal diffraction. The structures below and above the ferroelectric to paraelectric phase transition ({Tc} = 583 C) are compared: the data suggest a displacive second order phase transition which is dominated by thallium ion motion, but is also accompanied by subtle displacements of the framework atoms, during which, one of the two distinct TiO{sub 6} octahedra regularizes to {bar 1} symmetry.

• OSTI ID: 137038
• Journal Information: Materials Research Bulletin, Vol. 30, Issue 11; Other Information: PBD: Nov 1995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
THALLIUM PHOSPHATES
PHASE TRANSFORMATIONS
CRYSTAL STRUCTURE
TITANIUM PHOSPHATES
NEUTRON DIFFRACTION
TRANSITION TEMPERATURE
FERROELECTRIC MATERIALS