Pressure-Temperature Phase Diagrams of Ferroelectric {N(CH3)4}2CoCl4 and {N(CH3)4}2ZnCl4

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  • Shimizu Hiroyasu
    Department of Electrical Engineering, Faculty of Engineering, Gifu University
  • Kokubo Naoto
    Department of Electrical Engineering, Faculty of Engineering, Gifu University
  • Yasuda Naohiko
    Department of Electrical Engineering, Faculty of Engineering, Gifu University
  • Fujimoto Sanji
    Department of Electrical Engineering, Faculty of Engineering, Gifu University

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  • Pressure-Temperature Phase Diagrams of Ferroelectric {N(CH<SUB>3</SUB>)<SUB>4</SUB>}<SUB>2</SUB>CoCl<SUB>4</SUB> and {N(CH<SUB>3</SUB>)<SUB>4</SUB>}<SUB>2</SUB>ZnCl<SUB>4</SUB>
  • Pressure Temperature Phase Diagrams of

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Pressure-temperature phase diagrams of {N(CH3)4}2CoCl4 and {N(CH3)4}2ZnCl4 were studied by means of dielectric measurements in the temperature and pressure region of −180∼50°C and 0∼2.0 kbar. Phases of Co- and Zn-salts are classified in a single pressure-temperature phase diagram; phases I, II, III, IV, V, VI and VII in Co-salt coincide with phases I, II, III, VII (pressure-induced), IV, V and VI in Zn-salt, respectively, by considering that the applied pressure p=0 bar (=1 bar) onto Co-salt corresponds to the p=550 bar to Zn-salt. The pressure coefficients of IV–V and V–VI phase transition temperatures in Zn-salt have extremely large values of dTIV–V⁄dp=50±3°C/kbar and dTV–VI⁄dp=−54±3°C/kbar, respectively.

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