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- W1648461321 abstract "The dielectric properties of Li${mathrm{H}}_{3}$${(mathrm{S}mathrm{e}{mathrm{O}}_{3})}_{2}$ (LHS) and Li${mathrm{D}}_{3}$${(mathrm{S}mathrm{e}{mathrm{O}}_{3})}_{2}$ (LDS) were investigated as functions of hydrostatic pressure to 26 kbar and temperature 20-140ifmmode^circelsetextdegreefi{}C. A ferroelectric-to-paraelectric transition can be induced in both crystals at high pressure, and their Curie points decrease linearly with pressure with slopes of -6.0ifmmodepmelsetextpmfi{}0.2ifmmode^circelsetextdegreefi{}K/kbar for LHS and -5.9ifmmodepmelsetextpmfi{}0.4ifmmode^circelsetextdegreefi{}K/kbar for LDS. The high-pressure results indicate that LHS and LDS would have Curie points of 147ifmmode^circelsetextdegreefi{}C and 172ifmmode^circelsetextdegreefi{}C, respectively, at 1 bar were it not for the fact that both melt at 110ifmmode^circelsetextdegreefi{}C. The room-temperature phase of LDS may be antiferroelectric, but the experimental evidence is not conclusive. The experimental results on LHS are correlated by means of a phenomenological theory. The transition entropy calculated on the basis of this theory is 0.61 cal/mole ifmmode^circelsetextdegreefi{}K as compared with a value of 0.69 cal/mole ifmmode^circelsetextdegreefi{}K predicted from statistical mechanics for an order-disorder transition of the K${mathrm{H}}_{2}$P${mathrm{O}}_{4}$ type. The decrease of the Curie points of LHS and LDS with pressure are compared with the results on K${mathrm{H}}_{2}$P${mathrm{O}}_{4}$ recently reported elsewhere by the author and others. The similarities between LHS and K${mathrm{H}}_{2}$P${mathrm{O}}_{4}$ are discussed, and the point of view is taken that the ordering of the protons (which in turn leads to a distortion of the lattice) is the triggering mechanism for the ferroelectric transition in these crystals. The effects of pressure on their Curie points are discussed in terms of a model in which the proton moves in a double-minimum potential well along the length of the H bond. Increasing pressure decreases both the separation of the potential minima and the height of the potential barrier between them. Both effects lead to a lower Curie point." @default.
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- W1648461321 date "1968-09-10" @default.
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- W1648461321 title "Pressure and Temperature Dependence of the Dielectric Properties of Hydrogen-Bonded Ferroelectrics: Li<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>H</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant=normal>S</mml:mi><mml:mi …" @default.
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- W1648461321 doi "https://doi.org/10.1103/physrev.173.605" @default.
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