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首页> 外文期刊>Physica, B. Condensed Matter >Thermoluminescence studies of bismuth doped Ba_xCa_(1-x)S nanostructures
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Thermoluminescence studies of bismuth doped Ba_xCa_(1-x)S nanostructures

机译：铋掺杂的Ba_xCa_（1-x）S纳米结构的热致发光研究

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摘要

Bismuth doped Ba_(1-x)Ca_xS:Bi (x=01) nanocrystallities have been prepared by the solid state reaction method and characterized by XRD and TEM. X-ray diffraction analysis shows the formation of the compounds in cubic structure at room temperature. Only partial replacement of Ba is possible and we found that Ba_(0.5)Ca_(0.5)S:Bi could not be prepared due to the difference between ionic radii of barium and calcium. Thermoluminescence studies of these samples after exposure to UV radiation have been carried out. The TL glow curve of Ba_xCa_(1-x)S:Bi has been found to be a simple structure with a single peak at 405, 428 and 503 K for x=1, 0.8 and 0, respectively. The kinetic parameters at various heating rates namely activation energy (E), order of kinetics (b) and frequency factor (s) of the Ba _(1-x)Ca_xS:Bi (x=0.2) (0.4 mol%) sample have been determined using Chen's method. The deconvolution of curve was done using the GCD function suggested by Kitis. The effect of different heating rates and different amount of dose has also been discussed.
机译：通过固相反应法制备了铋掺杂的Ba_（1-x）Ca_xS：Bi（x = 01）纳米晶体，并通过XRD和TEM表征。 X射线衍射分析表明在室温下以立方结构形成化合物。 Ba只能部分置换，我们发现由于钡和钙的离子半径不同，无法制备Ba_（0.5）Ca_（0.5）S：Bi。这些样品在暴露于紫外线辐射后进行了热致发光研究。已经发现Ba_xCa_（1-x）S：Bi的TL辉光曲线是一种简单的结构，对于x = 1、0.8和0，分别在405、428和503 K处有一个峰。 Ba _（1-x）Ca_xS：Bi（x = 0.2）（0.4 mol％）样品在各种加热速率下的动力学参数即活化能（E），动力学阶数（b）和频率因子（s）具有是使用Chen的方法确定的。使用Kitis建议的GCD函数对曲线进行反卷积。还讨论了不同加热速率和不同剂量的影响。

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