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- W2020582172 abstract "Five compositions of K6−2x[FeII2 (FeII4−2xFeIII4+2x)]F30 with 0≤x≤0.20 have been investigated. The Curie temperature Tc decreases from 490 K for x=0 to 230 K for x=0.20. The spontaneous strain es=45×10−4 for x=0 at 300 K, and decreases with increasing x to es=0 for x≥0.075. The entropy change at the transition from the ferroelectric–ferroelastic to the paraelectric–paraelastic phase is 5.5 J mol−1 K−1 for x=0, decreasing to 1.5 J mol−1 K−1 for x=0.20. Calorimetric and dielectric measurements show that the phase transition broadens as x increases. The composition dependence of the phase transition is a function of the Fe2+/Fe3+ distribution. The presence of one Fe3+ ion on the Fe2+ sites of ten unit cells reduces Tc by 150 K. The entropy change at Tc for x≂0.2 corresponds to significant remaining displacements, from the tetragonal unit-cell positions, being associated only with two of the three independent Fe atoms and with not more than two of the eight independent F atoms in each unit cell. UFAIPXR" @default.
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- W2020582172 title "Phase transition dependence on composition in ferroelectric–ferroelastic K<sub>3−<i>x</i></sub>Fe<sub>5</sub>F<sub>1</sub><sub>5</sub>for 0≤<i>x</i>≤0.20" @default.
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- W2020582172 doi "https://doi.org/10.1063/1.345485" @default.
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