Dilatometric Study of Critical Behavior in KH<SUB>2</SUB>PO<SUB>4</SUB>

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  • Dilatometric Study of Critical Behavior in KH2PO4
  • Dilatometric Study of Critical Behavior

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Abstract

Dilatometric measurements have been made on KH2PO4 along the ferroelectric c-axis over the temperature range from 90 K to 240 K. Discrepancy between the phenomenological theory and the experimental result is found in the temperature dependence of the spontaneous strain near the Curie temperature, Tc. It is shown that the anomalous part of the thermal expansion coefficient above Tc changes logarithmically on T−Tc in the temperature range 0.15 K\lesssimT−Tc\lesssim15 K.

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