Studies on defect structures of Mn~(2+) and Fe~(3+) impurity centers in ZnO crystals;

Different Zn salts including Zn(CH_3COO)_2·2H_2O,ZnCl_2,Zn(NO_3)_2·6H_2O and ZnSO_4·7H_2O and different alkalies including NaOH and KOH were used as raw materials to produce the precursory solution Zn(OH)~(2-)_4,and ZnO crystals were synthesized when Zn(OH)~(2-)_4 decomposed in hydrothermal environment.

ZnO crystal has many good physical and chemical properties,which make it possible to be a promising material for the next generation optoelectronic application.

In the present dissertation,the study is on fabricating high quality hydrothermal ZnO crystals,is on influences on crystal s appearances and quality under growing conditions of spontaneous crystallizations,is on manufacturing autoclave with lining for growing large size ZnO crystals,is on crystal s quality under varied growing conditions with seeds.

Fabrication and characterization of ZnO nanocrystals;