Investigation of Ferroelectric Phase Transition of Rochelle Salt

Zhou, Guoliang; Jianhai, Wu; Ai-kun, Wang; Fenglei,; He, Wenchen

doi:10.1080/00150190802363173

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…7). Their shapes resemble the temperature dependencies of the dielectric susceptibility and spontaneous polarization reported earlier (Mueller, 1935;Cady, 1946;Stasyuk & Velychko, 2005;Guoxiang et al, 2008;Levitskii et al, 2010;Khan & Upadhyay, 2021).…”

Section: A Comparison Of Lt-pe and Ht-pe Phasessupporting

confidence: 82%

“…The temperature dependencies of the atomic displacement parameters indicate clearly that the model of static disorder providing two positions for each atom is not valid at least for the LT-PE phase. The atomic displacement parameters of K1 do not show a critical temperature dependency similar to that of dielectric susceptibility or spontaneous polarization (Mueller, 1935;Cady, 1946;Stasyuk & Velychko, 2005;Guoxiang et al, 2008;Levitskii et al, 2010;Khan & Upadhyay, 2021). On transition from the PE to the FE phase the residual density near the K1 atom does not change much, and is similar in the FE and PE phases.…”

Section: The Nature Of the K1 Atom Disordermentioning

confidence: 84%

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Structural changes in Rochelle salt on phase transitions revisited in a multi-temperature single-crystal X-ray diffraction study

Sharaya,

Zakharov,

Boldyreva

2024

Acta Crystallogr Sect B

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Phase transitions in Rochelle salt [sodium potassium L(+)-tartrate tetrahydrate] are revisited in a single-crystal X-ray diffraction multi-temperature study on cooling from 308 to 100 K across the high-temperature paraelectric (PE) ↔ ferroelectric ↔ low-temperature PE phase transition points. The results of structure refinement using three different models (a harmonic with and without disorder, and an anharmonic) were compared. The temperature dependencies of anisotropic displacement parameters (ADPs) and U eq, which can be calculated directly from ADPs, for the low-temperature PE phase indicate clearly the dynamic nature of disorder of the K1 atoms. The structures of the low-temperature and the high-temperature PE phases are compared for the first time at multiple temperatures for each phase based on diffraction data collected from the same single crystal. The data indicate that the high-temperature and the low-temperature paraelectric phases are probably not two different phases, as was assumed in earlier works, but are structurally the same phase at different temperatures.

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Section: A Comparison Of Lt-pe and Ht-pe Phasessupporting

confidence: 82%

Section: The Nature Of the K1 Atom Disordermentioning

confidence: 84%

Structural changes in Rochelle salt on phase transitions revisited in a multi-temperature single-crystal X-ray diffraction study

Sharaya,

Zakharov,

Boldyreva

2024

Acta Crystallogr Sect B

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New ferroelastic properties and the paraelectric-ferroelectric-paraelectric phase transitions of Rochelle salt

Lim¹,

Lee²

2011

Journal of Applied Physics

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The NMR spectra and the spin-lattice relaxation times, T1, of Rochelle salt crystals were studied as functions of temperature. Two groups of resonance lines were found in the 23Na and 39K NMR spectra of the paraelectric phases below TC1 and above TC2, whereas four groups of resonance lines were obtained in the 23Na and 39K NMR spectra of the ferroelectric phase between TC1 and TC2. To investigate the extra two groups of resonance lines in the ferroelectric phase, the stress-strain hysteresis loop of the Rochelle salt crystal was obtained, and the ferroelastic character of the Rochelle salt crystals suggested by Sapriel’s theory was established by the relationship between the 23Na and 39K NMR spectra and the stress-strain hysteresis loop results. Therefore, ferroelastic and ferroelectric properties coexist in the phase between TC1 and TC2.

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Phenomenological analysis of positive and negative electrocaloric effects in Rochelle salt

Li,

Tao,

Xiong

et al. 2024

Applied Physics Letters

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Ferroelectrics exhibiting both positive and negative electrocaloric effects stand out as promising materials for achieving high-efficiency solid-state refrigeration. The phase transition is acknowledged as a crucial factor in designing such materials. This study investigates the electrocaloric behavior and its correlation with phase transitions in Rochelle salt single crystal using Landau thermodynamic theory. Analysis of free energy density, ferroelectric, and dielectric data uncovers a complex temperature-dependent phase transition sequence of paraelectric–ferroelectric–paraelectric. This imparts Rochelle salt single crystal with intriguing field-induced phase transition behaviors and electrocaloric responses. Pronounced positive and negative electrocaloric effects are, respectively, observed near the high-temperature and low-temperature Curie point. The opposite sign of entropy differences between the ferroelectric and the two paraelectric phases is identified as the origin of the difference in electrocaloric response. These findings not only enhance our understanding of the electrocaloric effect but also provide a design solution for materials with the coexistence of positive and negative electrocaloric effects.

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Investigation of Ferroelectric Phase Transition of Rochelle Salt

Cited by 4 publications

References 9 publications

Structural changes in Rochelle salt on phase transitions revisited in a multi-temperature single-crystal X-ray diffraction study

Structural changes in Rochelle salt on phase transitions revisited in a multi-temperature single-crystal X-ray diffraction study

New ferroelastic properties and the paraelectric-ferroelectric-paraelectric phase transitions of Rochelle salt

Phenomenological analysis of positive and negative electrocaloric effects in Rochelle salt

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