Accession Number : AD0701376

Title :   HABIT CHANGES OF SAPPHIRE GROWN FROM PbO-PbF2 AND MoO3-PbF2 FLUXES.

Descriptive Note : Rept. for Jul 67-Apr 68,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Chase,Armond B. ; Osmer,Judith A.

Report Date : 10 OCT 1969

Pagination or Media Count : 22

Abstract : Single crystals of Al2O3 (sapphire) were grown from both PbO-PbF2 and MoO3-PbF2 fluxes. Their habits varied from flat plates (PbF2-rich melts) to equidimensional crystals (PbO- or MoO3-rich melts). The primary growth planes on these crystals are basal planes (0001), first-order rhombs (10-11), and second-order rhombs (01-12). The habit change is interpreted on the basis of F(1-) crystal contamination and Pb(2+) surface adsorption. Possible ion species in the melt and their relative importance on crystal growth from these melt systems are discussed. (Author)

Descriptors :   (*SAPPHIRE, *CRYSTAL GROWTH), SINGLE CRYSTALS, CRYSTAL STRUCTURE, IMPURITIES, SURFACE PROPERTIES, ADSORPTION, LEAD COMPOUNDS, OXIDES, FLUORIDES, MOLYBDENUM COMPOUNDS

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE