Abstract
The frequency and temperature response of the polarization of BaTi from 1 to 1000 and between 24 and 200°C has been determined by transmission and reflectivity measurements on polarized single crystals. A single absorption band located at 491 was observed in transmission, while in reflectivity a drop occurs from 10 to 80 and absorption bands are located near 175 and 470 . These bands show temperature-dependent splittings caused by changes in crystal symmetry. Reflectivity analysis indicates that the dispersion of the polarization in single-domain BaTi consists of resonances at 12, 182, and 491 . The 12- resonance is highly damped and exhibits an unusual dispersion. The integrated intensity of the 12- resonance is very large, and above the Curie point decreases rapidly with increasing temperature. Its frequency remains between 6 and 22 in the 24 to 200°C range.
- Received 5 May 1964
DOI:https://doi.org/10.1103/PhysRev.136.A429
©1964 American Physical Society