Does BaTi03 lose the center of symmetry in a single step on the cubic-to-tetragonal transition? A new finding by the milli-Kelvin-stabilized cell"

Akira Kojima; Yukio Yoshimura; Hiroshi Iwasaki

doi:10.1117/12.432766

11 July 2001 Does BaTi0₃ lose the center of symmetry in a single step on the cubic-to-tetragonal transition? A new finding by the milli-Kelvin-stabilized cell

Akira Kojima, Yukio Yoshimura, Hiroshi Iwasaki

Author Affiliations +

Proceedings Volume 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics; (2001) https://doi.org/10.1117/12.432766
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

Abstract

We have developed mK-stabilized cell having a fine temperature stability better than 1 mK which can be used to investigate phase transitions in solids not only by making calorimetric measurements but also, with the heat flux sensor, by making other kinds of measurements at an extremely slow rate of temperature change both on heating and cooling. Precise data with a very fine temperature resolution can be obtained by the measurements. It was applied to the measurements for the cubic-to- tetragonal transition at 408 K in BaTiO₃. A single crystal sample prepared by the top-seeded solution growth method was used and no external field was applied across the sample previously. Dielectric constant and displacement currents were measured as well as calorimetric properties. It was found that BaTiO₃ does not undergo the transition in a single step on cooling but in a multi-step with several thermal anomalies in a temperature range of 0.5 K. The first step corresponds to the process with a large change of dielectric constant but without any displacement currents, while the last step is accompanied by the displacement currents with an appreciably small dielectric change. Flow of the displacement currents implies the loss of the center- of-symmetry. The results obtained may cast light into the elucidation of the transition process.

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Akira Kojima, Yukio Yoshimura, and Hiroshi Iwasaki "Does BaTi0₃ lose the center of symmetry in a single step on the cubic-to-tetragonal transition? A new finding by the milli-Kelvin-stabilized cell", Proc. SPIE 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics, (11 July 2001); https://doi.org/10.1117/12.432766

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KEYWORDS

Temperature metrology

Dielectrics

Ferroelectric materials

Copper

Crystals

Sensors

X-ray diffraction

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