Accession Number : AD0706116

Title :   COLOR CENTERS AND THE REFRACTIVE INDEX OF CALCIUM OXIDE AND STRONTIUM OXIDE.

Descriptive Note : Final scientific rept.,

Corporate Author : IDAHO UNIV MOSCOW DEPT OF PHYSICS

Personal Author(s) : Sieckmann,Everett F.

Report Date : 24 MAR 1970

Pagination or Media Count : 6

Abstract : Single crystals of calcium oxide and strontium oxide have been produced by fusion of the powder with an electric arc in a cylindrical graphite crucible rotated on a horizontal axis at sufficient angular velocity to keep its contents thrown against the crucible walls and thus, by effectively melting the material in a crucible of its own powder, eliminating chemical reaction of the molten material with the crucible. An N2 gas jet passing through the graphite electrodes eliminated any carbide which may have formed. Optically clear crystals 1 cm x 1/2 cm x 1/2 cm were produced. Single crystals of CaO were heated in an iron bomb with Ca metal to 1200 degrees tto 1300 degrees for several hours. This treatment introduced color centers into the CaO single crystals, the density of which, depended on the exact coloring temperature and the density of Ca atoms above the crystal. Crystals colored in this way were ground into prisms and their refractive index was studied as a function of the density of color centers in the crystal. Strontium oxide colored readily when heated in a reducing atmosphere. (Author)

Descriptors :   (*SINGLE CRYSTALS, *CRYSTAL GROWTH), (*CALCIUM OXIDES, *COLOR CENTERS), (*STRONTIUM COMPOUNDS, COLOR CENTERS), (*REFRACTIVE INDEX, MEASUREMENT), OXIDES

Subject Categories : Crystallography
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE