科研之友
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摘要
An anomalous increase in the real part of dielectric response is observed in Mn0.5Fe0.5AlPO4(OH)(2)H2O while cooling to similar to 70 K. This is addressed to field-induced proton dynamics in a short hydrogen bond of 2.480(3) angstrom. The absence of discontinuities in heat capacity curves above the Neel temperature (T-N approximate to 7 K) excludes a paraelectric to antiferroelectric phase transition. Upon the application of mild hydrostatic pressures below 1.6 GPa, the maximum in the dielectric response is shifted from 70 K to lower temperatures near 2 K. This explains a narrow correlation between proton transfer and the compression of the short hydrogen bond length.
- 出版日期2017-9-13
