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采用原电池电化学法制备了钨酸锶钙(Sr1–yCayWO4)薄膜。利用X射线衍射仪、能谱仪和荧光计等对薄膜进行分析,并研究了薄膜中钙含量(y)与溶液中钙含量(x)之间的半定量关系。研究表明,所得薄膜为多晶膜,钙占据白钨矿结构的钨酸盐AWO4中A位晶格;可根据经验公式y=0.168+0.79x(0.2≤x≤0.8)来半定量地控制膜中的钙含量。随着x的增加,制备的Sr1–yCayWO4多晶体的形貌由SrWO4的双锥形演变到CaWO4的花束状团簇。在258 nm的紫外光激发下,可观测到位于415 nm和463 nm处的2个发光带;发光强度并不随着x的增加表现出规律性的变化,但当x=0.2时制备的Sr1–yCayWO4薄膜样品的发光强度最大。
Strontium tungstate calcium (Sr1-yCayWO4) thin films were prepared by galvanic electrochemical method. The films were analyzed by X-ray diffractometer, energy dispersive spectrometer and fluorometer. The semi-quantitative relationship between the content of calcium (y) and the content of calcium (x) in the solution was also studied. The results show that the obtained thin film is a polycrystalline film, and the calcium occupies the A-site lattice of the scheelite AWO4 of scheelite structure. The film can be semi-quantitatively controlled according to the empirical formula y = 0.168 + 0.79x (0.2≤x≤0.8) In the calcium content. With the increase of x, the morphology of the prepared Sr1-yCayWO4 polycrystals evolved from the biconical shape of SrWO4 to the cluster of CaWO4. Two luminescence bands at 415 nm and 463 nm were observed at 258 nm. The luminescence intensity did not show a regular change with the increase of x, but when x = 0.2, Sr1- yCayWO4 film samples have the highest luminous intensity.