Abstract
The temperature dependent electrostrictive effect, with respect to increasing the cooling rate to a cooling temperature, was quantitatively investigated in potassium tantalate niobate (KTN) lead-free single crystals above and near Curie temperature (TC). High work-function Pt electrodes are used to minimize the effect of charge injection, and the electric field induced displacement was measured with Michelson interferometry. It was found that a giant electrostrictive coefficient of 696 × 10−16 m2/V2 could be obtained at a high cooling rate of 0.75 °C/s to a temperature of TC + 4.5 °C due to the evolution of polar nano-regions, which is one order of magnitude larger than the previously reported value in KTN crystals. This strengthens the realization of replacing toxic lead-based electrostrictive materials with environmentally friendly KTN materials in real world applications.
Highlights
In this paper, we explored the effects of rapid cooling in KTa 1–xNbxO3 (KTN, x ≈ 0.398) single crystals
A value that is more than one order of magnitude higher than the previously reported data for the KTN crystals of a similar composition (M11 = 17.6 × 10−16 m2/V2)
Since this study is focused on the electric field induced-strain along a single direction (S1 ∝ E1), given the large relative permittivity and crystal symmetry of KTN in this phase, Eq (2) can be substituted into Eq (1) and simplified to
Summary
In this paper, we explored the effects of rapid cooling in KTa 1–xNbxO3 (KTN, x ≈ 0.398) single crystals.
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