Abstract
The mean-square angular displacements of the hydrogen halide molecules in the ferroelectric phase are calculated in the harmonic approximation in terms of the normal mode frequencies assuming four molecules per unit cell. When the infrared (ir) absorption frequencies are used in the calculation of the mean-square angular displacements, the results do not agree with those obtained from the neutron diffraction. The comparison of the NQR frequency data with the spontaneous polarization measurements suggests chain-polarization-reversing excitations. The two-dimensional Ising model is applied to calculate the temperature dependence of the polarization, and results in reasonable agreement with the experimental data are obtained.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
