【摘要】 采用正交实验法,系统研究了S/Gd原子比、还原温度和还原时间对水热-还原制备的硫氧化钆（Gd₂O₂S）粉末纯净度的影响。XRD分析结果表明,当S/Gd原子比为0.7或还原时间为32 h时,还原产物中包含Gd₂O₂S和Gd₂O₃两相,所得产物的纯净度不高。当增大S/Gd原子比和降低还原时间时,所得还原产物仅含有Gd₂O₂S单相,纯净度较高。正交实验分析结果表明,还原时间对Gd₂O₂S粉末的纯净度影响最大,S/Gd原子比次之,还原温度的影响最小。最佳的水热-还原制备纯净Gd₂O₂S粉末的工艺参数为:S/Gd原子比0.9,还原温度为725℃,还原时间为24 h。更多还原

【Abstract】 The effects of S/Gd atomic ratio,reduction temperature and reduction time on the purity of gadolinium oxysulfide（Gd₂O₂S） powder prepared by hydrothermal-reduction were systematically studied by orthogonal experiment in this paper.The XRD analysis results show that the reduction products consist of Gd₂O₂S and Gd₂O₃ phases when the S/Gd atom ratio is 0.7 or the reduction time is 32 h.While a pure Gd₂O₂S single phase is obtained when the S/Gd atomic ratio increases and the reduction time decreases.The results of orthogonal experiments indicate that the reduction time plays the dominant role in the purity of Gd₂O₂S powder,then following by the S/Gd atomic ration and the reduction temperature.The optimal parameters for preparing the pure Gd₂O₂S powders are as follows:the S/Gd atomic ratio of 0.9,reduction temperature of 725 ℃,and reduction time of 24 h.更多还原