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The usefulness of microwave heating and microwave generation of plasma for solid-state synthesis of Sb2Te3 crystals is reported. Lengths of time and molar ratios of Sb:Te were varied to achieve pure products heated by a 900 W microwave-irradiated plasma. In the present research, the products were Sb2Te3 with a rhombohedral crystal system using 2:2, 2:1.75 and 2:1.5 molar ratios of Sb:Te, and lengths...
Aluminum nitride (AlN) bulk single crystals up to 45 mm in diameter and 10 mm in thickness have been successfully grown on 6H-SiC(0001) substrates by the sublimation method. Moreover, high growth rate of 200μm/h has been achieved by high temperature homo-epitaxial AlN growth on AlN(0001) substrate. The Raman spectrum indicates that the polytype of the grown AlN single crystals is a Wurtzite-2H type...
We report a simple synthesis of AlN nanowires via catalyst-assisted chemical vapor deposition method. These high quality and uniform nanowires have smooth surface with diameter of 50 nm and length of 10-30 ?? m, which are hexagonal single-crystal with lattice parameters c = 0.497 nm, a = 0.272 nm and grow along [100] direction. The morphology and structure were characterized by scanning electron microscopy,...
ZnSe nanocrystals were elaborated in KDP dielectric crystalline matrix by addition of ZnSe powder to the mother solution during crystal growth. Optical absorption spectra show a band situated at 270 nm indicating impurity of KDP. X-ray diffraction confirm ZnSe inclusions incorporation, the average size was estimated to 13 nm. Micro-Raman measurement showing widening and blue-shifting of LO and TO...
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