摘要
采用液相沉淀法合成两种水合硼酸锶SrB_2O_4·4H_2O和SrB_6O_(10)·5H_2O,将其高温煅烧制备出纯四硼酸锶(SrB_4O_7)相,分析了高温煅烧过程、产物的物相和形貌,研究了煅烧温度和保温时间等因素的影响。结果表明,在加热过程中水合硼酸锶发生脱水→非晶化→晶化过程,且SrB_6O_(10)在800℃左右分解为SrB_4O_7和液态氧化硼;将SrB_2O_4·4H_2O和SrB_6O_(10)·5H_2O在900℃煅烧4 h可制得纯相四硼酸锶;延长煅烧时间可提高产物的晶化程度,但是其晶型没有明显的变化。用该法制备的SrB_4O_7:Eu荧光粉,其发光强度明显比以SrCO_3和H_3BO_3为原料制备的样品高.
Two hydrated strontium borate（SrB2O4·4H2O and SrB6O10·5H2O） were synthesized by liquid-phase precipitation method,and pure phase strontium tetraborate（SrB4O7） was obtained by high temperature calcination.The phase compositions,morphology and the high temperature sintering process of products were characterized by XRD,SEM,TG-DTA and chemical composition analysis. The effects of calcining temperature and holding time were investigated.The results show that the process of dehydration→amorphization→crystallization exists in the calcination of hydrated strontium borate. SrB6O10 is unstable at 800℃,and decomposed into SrB4O7 and liquid boron oxide.Pure strontium tetraborate was obtained with SrB2O4·4H2O and SrB6O（10）·5H2O as raw materials,which were calcined at 900℃for 4 h.With the increasing of reaction time,the crystallization degrees of products are improved, but the crystal structures are unaffected essentially.SrB4O7：Eu phosphors were prepared using this method.It is also found that the emission intensity from the sample is higher than that synthesized using SrCO3 and H3BO3 as raw materials.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2010年第1期108-112,共5页
Chinese Journal of Materials Research
关键词
无机非金属材料
四硼酸锶
高温煅烧
煅烧温度
煅烧时间
inorganic non-metallic materials strontium tetraborate high-temperature calcination calcining temperature calcining time
