论文部分内容阅读
本文利用热分析、固体电阻率的测定、化学分析、红外吸收光谱分析和X射线粉末衍射分析等方法研究了在程序升温条件下LaOBr受潮变质的过程,确定其反应机理是:LaOBr+H_2O<160℃LaOBr·H_2O160℃La(OH)_2Br;确定了LaOBr:Tb受潮变质后的产物LaOBr·H_2O:Tb和La(OH)_2Br:Tb在阴极射线激发下不发光。La(OH)_2Br在空气中加热到360℃时又脱水而生成LaOBr,还研究了影响LaOBr稳定性的因素,确定了对LaOBr稳定性有利的合成反应条件。
In this paper, the process of Moisture deterioration of LaOBr under programmed temperature was studied by means of thermal analysis, measurement of solid resistivity, chemical analysis, infrared absorption spectroscopy and X-ray powder diffraction analysis. The reaction mechanism was determined as follows: LaOBr + H 2 O <160 ℃ LaOBr · H 2 O160 ℃ La (OH) _2Br. The products LaOBr · H_2O: Tb and La (OH) _2Br: Tb after LaOBr: Tb were determined to be dewatered did not emit light under the excitation of cathode ray. La (OH) 2 2Br was dehydrated to generate LaOBr when it was heated to 360 ° C in the air. The factors influencing the stability of LaOBr were also studied, and the synthesis reaction conditions favorable for the stability of LaOBr were determined.