Effect of Heat Treatment on Crystallization of Nd:YAG Ceramics
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2007年第2期
论文作者：张华山 苏春辉
文章页码：333 - 336
摘 要：(Nd0.01 Y0.99 )3 Al5 O12 nano-sized powders were synthesized by low temperature combustion （LCS）,using Nd2 O3 ,Y2 O3 ,Al（NO3）3 ·9H 2 O,ammonia water and citric acid as starting materials.The powders were characterized by TG-DTA,XRD,FT-IR,ICP and TEM,respectively.The grain sizes were calculated by the Scherrer’s formula using the full width at half maximum（FWHM）of YAG（420）crystal plane diffraction lines. The study focused on crystallization of ceramics at different heat treatment temperatures.The experimental results show that crystallizing temperature of YAG is 850℃,and the intermediate crystal phase YAP,appearing during heat treatment,transforms to YAG cubic crystal phase at the temperature of 1 050℃.The particle size of the powders synthesized by LCS is nano-sized.With the temperature increasing,the mean grain sizes raise,the stand deviations keep almost at the value of 2.0 and the lattice parameters decrease.The grains mainly grow by grain boundary diffusion.The lattice parameter expansion is caused by an increase of the repulsive dipolar interactions on surfaces of crystallites.
张华山，苏春辉
摘 要：(Nd0.01 Y0.99 )3 Al5 O12 nano-sized powders were synthesized by low temperature combustion （LCS）,using Nd2 O3 ,Y2 O3 ,Al（NO3）3 ·9H 2 O,ammonia water and citric acid as starting materials.The powders were characterized by TG-DTA,XRD,FT-IR,ICP and TEM,respectively.The grain sizes were calculated by the Scherrer’s formula using the full width at half maximum（FWHM）of YAG（420）crystal plane diffraction lines. The study focused on crystallization of ceramics at different heat treatment temperatures.The experimental results show that crystallizing temperature of YAG is 850℃,and the intermediate crystal phase YAP,appearing during heat treatment,transforms to YAG cubic crystal phase at the temperature of 1 050℃.The particle size of the powders synthesized by LCS is nano-sized.With the temperature increasing,the mean grain sizes raise,the stand deviations keep almost at the value of 2.0 and the lattice parameters decrease.The grains mainly grow by grain boundary diffusion.The lattice parameter expansion is caused by an increase of the repulsive dipolar interactions on surfaces of crystallites.
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