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本文利用溶剂热方法合成出四方相梭子状CaMoO4:Eu3+微晶,并利用金刚石对顶砧压机结合Raman光谱和荧光光谱技术研究了其在24.7GPa压力下的结构和发光性能变化。结果发现,在约4GPa时发生了从四方白钨矿结构到单斜褐钇铌矿结构的可逆相变。同时,随着压力的增加,CaMoO4:Eu3+微晶的发光峰发生缓慢红移,红光和橙光强度比的降低说明了Eu3+所处格位局域对称性的升高。
In this paper, the tetragonal shuttle-shaped CaMoO4: Eu3 + crystallites were synthesized by solvothermal method. The structure and luminescence properties of the tetragonal shuttle were investigated by Raman spectroscopy and fluorescence spectroscopy at a pressure of 24.7 GPa. As a result, it was found that the reversible phase transition from tetragonal scheelite structure to monoclinic yttrium-niobium ore structure occurred at about 4 GPa. Meanwhile, with the increase of pressure, the luminescence peak of CaMoO4: Eu3 + crystallizes slowly, and the decrease of intensity ratio of red light and orange light indicates the increase of the local symmetry of the lattice at Eu3 + site.