Study of ferroelectric phenomena and other related properties in $$\mathrm{NaKC}_4\mathrm{H}_4\mathrm{O}_6\cdot 4\mathrm{H}_2\mathrm{O}$$ crystal

Multi-stimuli responsive (l-tartrato)oxovanadium(v) complex salt with ferroelectric switching and thermistor properties

“…Both compounds are hydrogen-bonded tartrate-based materials with a single axis of spontaneous polarization, so a correlation can be made between them to some extent. The origin of the ferroelectricity of potassium sodium l -tartrate tetrahydrate has long been the subject of experimental and theoretical debate, 17,37,38 and it has recently been proposed that the ferroelectric-paraelectric phase transition from the monoclinic P 2 1 to the orthorhombic P 2 1 2 1 2 1 structure is not of the pure order–disorder type or the displacement type, but lies between the two types. The ferroelectric–paraelectric phase transition for 1·6H 2 O was not observed due to the limited thermal stability of the compound.…”