Accession Number : AD0668122

Title :   HYDROGEN DOPING AND PARAMAGNETIC PROPERTIES OF IONIC CRYSTALS AT HIGH TEMPERATURES,

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s) : Serway,Raymond A. ; Zogby,Reagen

Report Date : MAR 1968

Pagination or Media Count : 38

Abstract : This report describes the results of a two-phase solid state research program. The first phase was an effort to dope single crystals of the alkaline earth fluorides with hydrogen by diffusion techniques at high temperatures. The techniques used to successfully dope calcium fluoride with hydrogen and the difficulties encountered with cadmium fluoride are described. The second phase of the program was concerned with the measurement of the paramagnetic properties of several ionic crystals as a function of temperature. A possible potential result could be the design of a maser whose operating frequency can be tuned by varying the bath temperature. A high temperature 3 cm wavelength resonant cavity was designed and built, capable of operation up to about 850 degrees K. Electron spin resonance (ESR) data was taken on divalent manganese ions substitutional in calcium carbonate, calcium fluoride, and barium fluoride host lattices. For the case of manganese-doped calcium carbonate, a definite temperature dependence was measured for the hyperfine structure-splitting parameter. In addition, the crystal field-splitting energies were found to be temperature dependent. The temperature dependence of the hyperfine structure splitting was also measured for divalent manganese in CaF2 and BaF2. A discussion of these results in view of recent theoretical treatments is presented. (Author)

Descriptors :   (*ALKALINE EARTH COMPOUNDS, MAGNETIC PROPERTIES), (*CRYSTAL STRUCTURE, SPECTROSCOPY), PARAMAGNETIC MATERIALS, SINGLE CRYSTALS, ELECTRON PARAMAGNETIC RESONANCE, HYPERFINE STRUCTURE, DOPING, FLUORIDES, HYDROGEN, BAND THEORY OF SOLIDS, LASERS, MASERS, PHONONS, HIGH TEMPERATURE, MICROWAVE FREQUENCY

Subject Categories : Lasers and Masers
      Crystallography
      Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE