Dielectric relaxation and piezoelectric coupling in the mixed proton-glass crystal K0.61(NH4)0.39H2PO4,

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1993-11-01

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Measurements of the dielectric permittivities in the mixed proton-glass crystal K0.61(NH4)0.39H2PO4 are reported from 20 Hz to 200.8 MHz and for fields along both the a and c axes. Between 14 and 50 K, the c-axis permittivity outside the piezoelectric-resonance range shows a temperature-dependent spread in relaxation times but cannot be fit accurately with the Cole-Cole formula. Strong piezoelectric resonance for a field along the c axis was observed in the region between 100 kHz and 10 MHz.

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C.-S. Tu, V.H. Schmidt, and A.A. Saleh, “Dielectric relaxation and piezoelectric coupling in the mixed proton-glass crystal K0.61(NH4)0.39H2PO4,” Phys. Rev. B 48, 12483 (1993).
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