Anomalous dielectric response of short hydrogen bonds under pressure: the case of (Mn,Fe)2+AlPO4(OH)2H2O

Anomalous dielectric response of short hydrogen bonds under pressure: the case of (Mn,Fe)2+AlPO4(OH)2H2O

An anomalous increase in the real part of dielectric response is observed in Mn0.5Fe0.5AlPO4(OH)2H2O while cooling to ~70 K. This is addressed to field-induced proton dynamics in a short hydrogen bond of 2.480(3) Å. The absence of discontinuities in heat capacity curves above the Néel temperature (T...

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Veröffentlicht in:Journal of physics. Condensed matter 2017-09, Vol.29 (36), p.365401-365401
Hauptverfasser: Röska, B, Park, S-H, Yoshimori, Y, Kimura, K, Kimura, T
Format: Artikel
Sprache:eng
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eosphorite-childrenite series
hopping polarisation
phosphatic oxyhydroxides
proton motion
short hydrogen bonds
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container_issue 36
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container_title Journal of physics. Condensed matter
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creator Röska, B
Park, S-H
Yoshimori, Y
Kimura, K
Kimura, T
description An anomalous increase in the real part of dielectric response is observed in Mn0.5Fe0.5AlPO4(OH)2H2O while cooling to ~70 K. This is addressed to field-induced proton dynamics in a short hydrogen bond of 2.480(3) Å. The absence of discontinuities in heat capacity curves above the Néel temperature (TN     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.
doi_str_mv 10.1088/1361-648X/aa7adf
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subjects eosphorite-childrenite series
hopping polarisation
phosphatic oxyhydroxides
proton motion
short hydrogen bonds
title Anomalous dielectric response of short hydrogen bonds under pressure: the case of (Mn,Fe)2+AlPO4(OH)2H2O
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