Dielectric constant, loss factor and ac conductivity of Ni2+-doped K2ZnCl4 crystals in the ferroelectric-commensurate, incommensurate and normal phases by M. A. Gaffar, A. M. Abousehly, A. Abu El-Fadl, and M. M. Mostafa

Crystal Research and Technology

Cryst. Res. Technol. 41, 1120 (2006) - Abstract -

Dielectric constant, loss factor and ac conductivity of Ni²⁺-doped K₂ZnCl₄ crystals in the ferroelectric-commensurate, incommensurate and normal phases

M. A. Gaffar, A. M. Abousehly*, A. Abu El-Fadl**, and M. M. Mostafa*

Physics Department, School of Science and Engineering, The American University in Cairo, Cairo 11511, Egypt
*Physics Department, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt
**Physics Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt

Keywords	potassium zinc chloride, electric and dielectric properties, commensuration and incommensuration
PACS	64.70.Rh, 72.80.Sk, 77.22.Gm, 77.80.-e
DOI	10.1002/crat.200610732

The dielectric constant, dielectric loss and ac conductivity of virgin and thermally cycled undoped and Ni²⁺-doped K₂ZnCl₄ (KZC) crystals in the ferroelectric-commensurate (FC), incommensurate (IC) and normal phases (N) have been studied. Anomalous behaviour at the two-phase transition points was observed while measuring the dielectric constant along the polar a-axis for the undoped sample. With increasing Ni²⁺-concentration a systematic shift of the phase transition temperature towards lower values and a continuous inhibition of the peak height were detected.

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