高温高压下SrB_4O_7：Eu^（2＋）玻璃的晶化

CRYSTALLIZATION PROCESS OF AMORPHOUS SrB_4O_7:Eu￣(2+)UNDER HIGH PRESSURE AND HIGH TEMPERATURE

利用Ｘ射线衍射和Ｅｕ￣（２＋）发射光谱方法研究了非晶玻璃ＳｒＢ＿４Ｏ＿７在高温高压下的晶化。结果表明：在５．０ＧＰａ压力下，２００℃仍为玻璃态，只有几个强度极低的小峰，表明有晶化的迹象；６００℃时已基本晶化，但为ＳｒＢ＿４Ｏ＿７正交相与ＳｒＢ＿２Ｏ＿４高压立方相二相共存；当温度提高到１０００℃时，晶化成了近单相的与常压ＳｒＢ＿４Ｏ＿７粉末晶体相同的正交结构。伴随晶化度的加强，Ｅｕ￣（２＋）发射强度增强，与Ｘ射线衍射结果相一致。

The crystallization process of amorphous SrB_4O_7 under high pressure were studied by using X-ray diffraction and Eu￣(2+)emission spectra.X-ray diffraction results show that under the pressure of 5.0GPa,at 200℃ there exists a few small diffraction peaks with very low intensi-ty,indicating trace crystallization.At 600℃,however,the crystallization process basically com-pletes,it becomes a mixture of two phases,one is an orthorhombic SrB_4O_7 and the other cubic SrB_2O_4; as the temperature increasing to 1000℃,the sample crystallizes to single phase SrB_4O_7 with a structure the same as the powder crystal sample's prepared under atmosphere.The above results were further confirmed by Eu￣(2+)emission spectra obsenations:the intensity of Eu￣(2+)emis-sion peak at 370nm increased obviously with the crystallinity of the sample.