摘要
首次利用AgNO3与KX（X为Cl-、Br-、I-）的室温固相反应成功地制备出纳米AgX粉末。并结合XRD、TEM、TG／DTA测试对其结构和性能进行了表征。发现固相反应制得的超细AgX与水相法制得的相应常粒AgX颜色有所不同。在相同合成条件下，AgCl、AgBr、AgI的粒径依次减小。DTA数据表明，纳米AgI的晶型转变温度与常粒AgI的相差甚微，而熔点却比常粒AgI的熔点大大降低。
Nanophase silver halides were synthesized firstly by solid-phase reactions of AgNO3with KX (X=Cl-, Br-, I-) at room temperature. Their structures,particle sizes, morphology and heat stability were characterized with XRD, TIM and TG/DTA techniques. It was found that the colour of nanophase AgX synthesize by solid-phase reactions is different from that of normal AgX synthesized in aquous solution, and their particle sizes d prepared under the same conditions decrease in the sequence: dAGCl>dAGBr>dAgl. The results of DTA curves of nanophase AgI and nounal AgI indicated that their transform temperatures of crystalline form from a-AgI to β-AgI are almost similar but their phase transform temperature from solid-state to liquid-state differ greatly. The melt point of nanophase AgI is much lower than that of nounal AgI.
关键词
室温
固相反应
纳米粉末
氯化银
溴化银
碘化银
Solid-phase reaction at room temperature Nanophase particle Sliver halide
