AlN whiskers or dendrites were synthesized with asublimation-recrystallization method by using Al, AlN powders and some additives as raw materials.Whiskers with different sizes that featured high purity and good cryst...AlN whiskers or dendrites were synthesized with asublimation-recrystallization method by using Al, AlN powders and some additives as raw materials.Whiskers with different sizes that featured high purity and good crystallinity were obtained bycontrolling temperature and gas supersaturation in the reaction container. The whiskers weredescribed as long and straight single crystals of approximately 1-30 mu m in diameter by thecentimeter range in length. However, AlN dendrites were about 1mm in diameter by 0.5cm in length,and showed an obviously preferential growth orientation, i.e., perpendicular to [21-bar1-bar1] and[101-bar1] planes. It is concluded that the whiskers or dendrites grow via the vapor-solidmechanism.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(No 59872004), the Cross-Century Talents
文摘AlN whiskers or dendrites were synthesized with asublimation-recrystallization method by using Al, AlN powders and some additives as raw materials.Whiskers with different sizes that featured high purity and good crystallinity were obtained bycontrolling temperature and gas supersaturation in the reaction container. The whiskers weredescribed as long and straight single crystals of approximately 1-30 mu m in diameter by thecentimeter range in length. However, AlN dendrites were about 1mm in diameter by 0.5cm in length,and showed an obviously preferential growth orientation, i.e., perpendicular to [21-bar1-bar1] and[101-bar1] planes. It is concluded that the whiskers or dendrites grow via the vapor-solidmechanism.
