Supplement to a Recent Thermodynamic Theory of the Incommensurate Transitions in NaNO_<2・> Accounting for the Observed ε vs T Curve Just Above the Incommensurate-to-Ferroelectric Transition Point
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The qualitative and quantitative results deduced by a recent theory [J. Phys.Soc. Jpn. 51 (1982) 515] were found to agree fairly well with the experimentalresults on NaN0.. However, of the theoretical e vs T graph, the part just abovethe incommensurate-to-ferroelectric transition point was found to disagree withthe observed one even qualitatively. Resolution of this item of disagreement isattempted in the present paper. To fundamental waves 0.cos (hx -0.) and7<. cos (hx -0.) which are a soft B.. wave and a hard B.. wave respectively,waves Q;cos(2hx-0;) and R,;cos(2/z,v -0.') are added (the wavenumber ofadded waves must be 2h, not any other) ; no further modification is made. Thisway is found to clear up the item of disagreement while not affecting at all anyof the items of agreement in the recent paper.
- 社団法人日本物理学会の論文
- 1982-09-15
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