Thermal Conductivity of Some Ferroelectric Crystals with Hydrogen Bonds

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概要

• 論文の詳細を見る

• The thermal conductivity of KH_2PO_4, KD_2PO_4 and KH_2AsO_4 single crystals was measured in the temperature range from 4.5 to 300°K. For all the samples critical changes of the thermal conductivity are found at the Curie temperatures. The conductivity decreases gradually with falling temperature in the paraelectric state where the phonon mean free paths are limited by the disordered hydrogen atoms to the lattice spacings. It rises steeply just below the Curie temperature, increases exponentially with further temperature fall and attains to a maximum near 10°K. A marked isotope effect is observed in the maximum values of KH_2PO_4 and KD_2PO_4. The former amounts to 600 m W/cm°K and the latter about 5500m W/cm°K. This effect may be attributed to the difference of hydrogen motions in the double-minimum potentials. The peak of KH_2ASO_4 is only 220m W/cm°K. A small anisotropy in the conduction is found in the exponential variation range for these three crystals.

• 社団法人日本物理学会の論文
• 1967-03-05

著者

• Suemune Yasutaka

  Electrical Communication Laboratories Nippon Telegraph And Telephone Public Corporation

• Suemune Yasutaka

  Electrical Communication Laboratory Nippon Telegraph And Telephone Public Corporation Musashino. Tok

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