P31Chemical-Shift Study of the Ferroelectric Transition in KD2PO4

Abstract
The P31 chemical-shift tensors σ have been determined as a function of temperature on going through the ferroelectric phase transition in a single crystal of KD2PO4, and an abrupt change in σ was found at Tc. The results show that the transition is not driven by an electronic instability but is a pure lattice transition of the order-disorder type, and demonstrate the usefulness of chemical-shift studies of structural phase transitions in solids.

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