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 (SrB_2O_4·4H_2O and SrB_6O_(10)·5H_2O) were synthesized by liquid-phase precipitation method, and pure phase strontium tetraborate (SrB_4O_7) 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. SrB_6O_(10) is unstable at 800 ℃, and decomposed into SrB_4O_7 and liquid boron oxide. Pure strontium tetraborate was obtained with SrB_2O_4·4H_2O and SrB_6O_(10)·SH_2O 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. SrB_4O_7:Eu phosphors were prepared using this method. It is also found that the emission intensity from the sample is higher than that synthesized using SrCO_3 and H_3BO_3 as raw materials.
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