燃烧法制备亚微米Co^(3+)掺杂LaBO_(3)粉体及表征

Synthesis and characterization of submicron Co^(3+)-doped LaBO_(3) powders by combustion method

以La(NO_(3))_(3)·6H_(2)O、Co(NO_(3))_(3)·6H_(2)O、H_(3)BO_(3)和C_(2)H_(5)NO_(2)为原料,采用燃烧法合成Co^(3+)掺杂LaBO_(3)粉体,其中原料摩尔比为[La(NO_(3))_(3)·6H_(2)O+Co(NO_(3))_(3)·6H_(2)O]:H_(3)BO_(3):C_(2)H_(5)NO_(2)=3:3:5,研究了目标产物La((1-x))Co_(x)BO_(3)(x=0.01~0.04)在750~950℃的合成反应过程及产物结晶形态,分析了合成条件对产物晶体形态的影响,得到了最佳的原料配比、反应温度、反应时间和掺杂量。结果表明,燃烧合成法可用于制备Co^(3+)掺杂LaBO_(3)粉体,且实验条件简单,煅烧温度较低,产率高,易于工业化。最佳反应条件为900℃、4 h,改性剂钴的掺杂量为x=0.03,产物为La_(0.97)Co_(0.03)BO_(3)粉体。在该反应条件下,产物颗粒大小均匀,为直径115~185 nm、长度400~600 nm的短棒状粉体。Co^(3+)掺杂LaBO_(3)粉体产物在330~440 nm处出现一个较宽的荧光激发带,说明具有较为均匀粒径和晶体形貌的Co^(3+)掺杂LaBO_(3)粉体可以作为制备发光粉体的基质材料。

Co^(3+)-doped LaBO_(3) powders were synthesized by combustion method using La(NO_(3))_(3)·6H_(2)O,Co(NO_(3))_(3)·6H_(2)O,H_(3)BO_(3),and C_(2)H_(5)NO_(2) as the raw materials with the mole ratio of[La(NO_(3))_(3)·6H_(2)O+Co(NO_(3))_(3)·6H_(2)O]:H_(3)BO_(3):C_(2)H_(5)NO_(2)=3:3:5.The synthesis process and crystal morphology of the target products La(1−x)Co_(x)BO_(3)(x=0.01~0.04)at 750~950℃were studied.The influence of synthesis conditions on the crystal morphology of the powder products was analyzed.The optimal ratio of the raw materials,reaction temperature,reaction time,and doping dosage were obtained.In the results,the combustion synthesis method can be used to prepare the Co^(3+)-doped LaBO_(3) powders,and the experimental conditions are simple,the calcination temperature is low,the yield is high,and it is easy to industrialization.The optimal reaction condition is 900℃and 4 h,the doping dosage of cobalt as modifier is x=0.03,and the products are La_(0.97)Co_(0.03)BO_(3) powders.Under the optimal reaction condition,the products are the short rod-like powders in the uniform particle size distribution with the diameter of 115~185 nm and the length of 400~600 nm.The fluorescence excitation band appears at 330~440 nm for the Co^(3+)-doped LaBO_(3) powders,indicating that the Co^(3+)-doped LaBO_(3) powders with the uniform particle size and crystal morphology can be used as the substrate material for preparing the luminescent powders.