Dielectric Study of the Phase Transitions of Ca_2Ba(C_3H_7COO)_6 (DBB) (Condensed Matter: Structure, Mechanical and Thermal Properties)

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概要

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• Phase transitions in dicalcium barium butyrate, Ca_2Ba(C_3H_7COO)_6 (DBB), have been studied by dielectric measurements. At atmospheric pressure, two first order phase transitions are detected at 325 K (I-II transition) and 212 K (II-III transition). A dielectric relaxation with the activation energy of about 0.21 eV is observed in the lowest-temperature III phase. Effect of hydrostatic pressure on the phase transitions was measured and the pressure-temperature (p-T) phase diagram was obtained. The initial pressure coefficients of the I-II and II-II transition temperatures are 0.50 K/MPa and 0.08 K/MPa, respectively. Two pressure-induced phases, IV and V, were found. Unlike to the corresponding propionate crystal Ca_2Ba(C_2H_5COO)_6 (DBP) none of the pressure-induced phases show ferroelectric activity.

• 2003-05-15

著者

• Gesi Kazuo

  College Of Science And Engineering Iwaki Meisei University

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