1972/04/15 by G. L. Bottger, A. L. Geddes · 1 citation
Materials Science · Chemistry · #Thermal properties of materials #Nonlinear Optical Materials Research #Ferroelectric and Piezoelectric Materials #Refractive index #Debye model #Dielectric #Lattice constant #Materials science #Lattice vibration #Compressibility #Diffraction #Crystal structure #Condensed matter physics #Ellipsometry #Lattice (music) #Debye #Phonon #Optics #Crystallography #Thermodynamics #Chemistry #Physics #Thin film
paper · doi:10.1063/1.1677770
openalex publication_date 1972/04/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
The far-infrared transmission spectrum of AgF has been measured at room temperature and at 143°K in the region of the lattice vibrations. The zone-center transverse and longitudinal optic modes were found and their frequencies determined. The room-temperature crystal structure of AgF was restudied using x-ray diffraction, and an NaCl-type structure (Oh5) was confirmed with a lattice constant of 4.936±0.001 Å. Ellipsometry was utilized to determine the high-frequency refractive index of AgF; n=1.73±0.02. The static dielectric constant at room temperature (ε0=10.6±0.7) and at 143°K (ε0=10.3±0.3) was calculated using the Lyddane-Sachs-Teller relation. The Szigeti estimates of effective ionic charge and of compressibility were calculated, and their significance is discussed. Values were also computed for the elastic constants and the Debye characteristic temperature.