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- W2073247653 abstract "According to a theory developed by Landau and Khalatnikov, the approach of long-range order to equilibrium can be characterized by a relaxation time with a temperature dependence of the form: τ=β/(Tc − T), where β is constant and Tc is a second-order phase transition temperature. The ferroelectric material, triglycine sulfate, is known to undergo a second-order phase transition at its Curie temperature. The long-range order is identifiable with the spontaneous polarization directed along the crystallographic B axis. Ultrasonic waves traveling perpendicularly to the B axis coupled to the spontaneous polarization and exhibited marked relaxational effects for T<Tc. Detailed absorption measurements verified the Landau-Khalatnikov relation, yielding β=2.25×10−10 sec/deg C and Tc=49.09°C. Using this value of β, the kinetic coefficient γ was calculated to be 8.0×1010 cgs. With the absorption results, a calculation of the accompanying rise in the sound velocity as T increases through Tc was performed. This rise was only 40% of the rise actually measured, indicating that long-range order is not sufficient to explain the temperature dependence of sound velocity for T near Tc. Substantial scattering losses were observed for temperatures above Tc. These are attributed to needle-shaped domains, which retain polarization for T>Tc. These domains, which point along the B axis, have cross sections comparable in size to the sound wavelengths." @default.
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- W2073247653 date "1964-01-01" @default.
- W2073247653 modified "2023-09-23" @default.
- W2073247653 title "Ultrasonic Relaxation near the Curie Temperature of Ferroelectric Triglycine Sulfate" @default.
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- W2073247653 doi "https://doi.org/10.1063/1.1713064" @default.
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