Crystallization Process of Amorphous SrB4O7：Eu2+ under High Pressure and High Temperature
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摘要: 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。Abstract: 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.
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Key words:
- SrB4O7 /
- high pressure and high temperature /
- crystallization /
- Eu2+ emission spectrum
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Ponyatovsky E G, Barkalov O I. Materials Science Reports, 1992, 8: 147. Mishima O, Calvert L D, Whelley E. Nature, 1984, 310: 393. Hemley R J, Jephcoat A P, Mao H K, et al. Nature, 1988, 334: 52. 刘维娜, 刘宏建, 冯禹辰, 等. 髙压物理学报, 1993, 7(3): 167. 苏文辉, 陈久华, 千正男, 等. 中国稀土学报, 1989, 7(2): 59. 许伟, 苏文辉, 崔硕景, 等. 高压物理学报, 1988, 2(3): 237. -
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