SINGLE-CRYSTAL SPINEL PLATE Russian patent published in 2008 - IPC C30B29/26 C30B33/00 

FIELD: technological processes; chemistry.

SUBSTANCE: single-crystal spinel plate has front and back sides, <111> crystallographic orientation and external perimeter, which has the first and the second facets, at that the first facet means direction of plate cleavage plane, which passes through front surface of geometric locus of points that stretches along the line, which is parallel to the first facet, and the second facet means direction of cleavage plane breaking, at that plate is made of composition in accordance with common formula aAD•bE₂D₃, in which A is selected from group that includes Mg, Ca, Zn, Mn, Ba, Sr, Cd, Fe, and also their combinations, E is selected from group, which includes Al, In, Cr, Sc, Lu, Fe, and also their combinations, and D is selected from group, which includes O, S, Se, and also their combinations. Boule and plates prepared from it mainly consist of single spinel phase, without secondary phases, and do not contain contaminants and alloying admixtures, i.e. possess improved technological characteristics.

EFFECT: higher extent of finished products output; increase of plates size and reduction of processing cost in manufacture of semiconductors.

18 cl, 1 tbl, 1 ex, 5 dwg