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- W1993926204 startingPage "134" @default.
- W1993926204 abstract "Measurements of low-temperature specific heats (2-37 K) are reported for the first time on some common paraelectrics (thallous halides, Pb${mathrm{F}}_{2}$, KTa${mathrm{O}}_{3}$), ferroelectrics [BaTi${mathrm{O}}_{3}$, potassium dihydrogen phosphate or KDP, triglycine sulfate or TGS, LiNb${mathrm{O}}_{3}$, LiTa${mathrm{O}}_{3}$, Pb(${mathrm{Zr}}_{0.65}$ ${mathrm{Ti}}_{0.35}$)${mathrm{O}}_{3}$ or PZT 65/35], and antiferroelectrics [Pb(${mathrm{Zr}}_{0.95}$ ${mathrm{Ti}}_{0.05}$)${mathrm{O}}_{3}$ or PZT 95/5, ${mathrm{Pb}}_{2}$${mathrm{Nb}}_{2}$${mathrm{O}}_{7}$]. All materials display maxima in $C{T}^{ensuremath{-}3}$, and excellent fits to experimental data are obtained with single Einstein frequencies. The Einstein frequencies vary from 19 ${mathrm{cm}}^{ensuremath{-}1}$ for TlCl to 99 ${mathrm{cm}}^{ensuremath{-}1}$ for BaTi${mathrm{O}}_{3}$. The frequencies in LiNb${mathrm{O}}_{3}$ (79 ${mathrm{cm}}^{ensuremath{-}1}$) and LiTa${mathrm{O}}_{3}$ (61 ${mathrm{cm}}^{ensuremath{-}1}$) agree reasonably well with earlier Raman data at 300 K on $E$-symmetry optic modes and with recent low-temperature pyroelectric data. The TlBr frequency (22 ${mathrm{cm}}^{ensuremath{-}1}$) agrees well with the lowest phonon anomaly determined from neutron data, and the KTa${mathrm{O}}_{3}$ frequency (26 ${mathrm{cm}}^{ensuremath{-}1}$) is in good agreement with the average soft-mode frequency in this temperature range. No evidence is seen for the suggested phase transition in KTa${mathrm{O}}_{3}$ at 10 K. The PZT materials, which are compositionally in a field inaccessible to powder Raman methods, have frequencies of 32 (65/35) and 38 ${mathrm{cm}}^{ensuremath{-}1}$ (95/5), due probably to low-lying TA phonons. An unusual ${T}^{frac{3}{2}}$ contribution to the specific heat of the ferroelectrics TGS, KDP, BaTi${mathrm{O}}_{3}$, and LiNb${mathrm{O}}_{3}$ was found at the lowest temperatures. Experimental data are in excellent agreement with $C=A{T}^{3}+B{T}^{frac{3}{2}}$, and it is suggested that the ${T}^{frac{3}{2}}$ term is the domain-wall contribution." @default.
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- W1993926204 date "1976-07-01" @default.
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- W1993926204 title "Specific heats of paraelectrics, ferroelectrics, and antiferroelectrics at low temperatures" @default.
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