Properties of Rochelle Salt

摘要: In a qualitative way the anomalous properties of Rochelle salt can be explained on basis four different theories: ($a$) dipole theory, ($b$) by assuming polymorphic transitions at Curie points, ($c$) postulating an piezoelectric effect, and ($d$) with inter-action theory which assumes that structure fundamental crystal have no unusual characteristics ascribes observed anomalies to accidental degeneration interaction between elastic deformation electric polarization. The existence transition upper point is demonstrated in new experiment it shown this spontaneous deformation. It either one theories. A quantitative analysis experimental data, leads interpretation measurements, shows theories are not valid for salt. data verify conclusions insofar as they lead result would show abnormal temperature dependence dielectric constant even if were piezo-electric or deformations could suppressed. However, doubtful whether clamped has point. points free from lattice-dipole coupling described theory.