高温高压下SrB4O7：Eu2+玻璃的晶化

 利用X射线衍射和Eu²⁺发射光谱方法研究了非晶玻璃SrB₄O₇在高温高压下的晶化。结果表明：在5.0 GPa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SrB₄O₇正交相与SrB₄O₇高压立方相二相共存；当温度提高到1 000 ℃时，晶化成了近单相的与常压SrB₄O₇粉末晶体相同的正交结构。伴随晶化度的加强，Eu²⁺发射强度增强，与Ｘ射线衍射结果相一致。

Crystallization Process of Amorphous SrB4O7：Eu2+ under High Pressure and High Temperature

The crystallization process of amorphous SrB₄O₇ under high pressure were studied by using X-ray diffraction and Eu²⁺ emission spectra. X-ray diffraction results show that under the pressure of 5.0 GPa, at 200 ℃ there exists a few small diffraction peaks with very low intensity, indicating trace crystallization. At 600 ℃, however, the crystallization process basically completes, it becomes a mixture of two phases, one is an orthorhombic SrB₄O₇ and the other cubic SrB₄O₇; as the temperature increasing to 1 000 ℃, the sample crystallizes to single phase SrB₄O₇ with a structure the same as the powder crystal sample's prepared under atmosphere. The above results were further confirmed by Eu²⁺ emission spectra obsenations: the intensity of Eu²⁺ emission peak at 370nm increased obviously with the crystallinity of the sample.