Structure thermal expansion and optical property of alumina rich spinel substrat

Alumina-rich spinel is a new substrate for fabricating high-quality GaN-based light-emitting diodes. 1:3 spinel crystals (1 MgO for 3Al(2)O(3)) with dimension of diameter 36 mm x 55 mm have been grown by the Czochralski method. The crystal structure and lattice parameters were evaluated by single-cr