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首页> 外文期刊>Journal of Materials Research >Phase transformation of Er3+-doped Al2O3 powders prepared by the sol-gel method
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Phase transformation of Er3+-doped Al2O3 powders prepared by the sol-gel method

机译：溶胶-凝胶法制备掺Er3 +的Al2O3粉末的相变

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摘要

Er3+-doped Al2O3 powders were prepared by the sol-gel method, using aluminum isopropoxide [AI(OC3H7)(3)]-derived Al2O3 sols. The phase content diagram for the Er-doped Al-O system with the doping concentration up to 20 mol% is presented for sintering temperature from 550 to 1250 degreesC. The different crystalline types of (Al,Er)(2)O-3 phases-gamma, theta, alpha-and two Er-Al-O phases-ErAlO3 and Al10Er6O24-were detected. The Er3+ doping in the Al2O3 phases has a significant effect on phase transformations for gamma --> theta and theta --> alpha, indicating the enhancement for stability of the gamma and theta phases. Compared with the gamma-Al2O3 phase, the gamma-(Al,Er)(2)O-3 phase can be obtained at high temperatures up to about 1100 degreesC. The theta-(Al,Er)(2)O-3 phase, together with the alpha-(Al,Er)(2)O-3 phase, was still observed at 1200 degreesC under the high Er3+ doping concentration. The Er3+ doping suppressed the crystallization of the gamma and theta phases. At a low Er3+ doping concentration from about 2 to 5 mol%, the ErAlO3 phase precipitated out around 1100 degreesC. The Al10Er6O24 phase was observed at all sintering temperatures; the precipitation was carried out to all Er3+ doping concentrations with increasing sintering temperatures up to about 1200 degreesC. [References: 17]
机译：使用异丙醇铝[AI（OC3H7）（3）]衍生的Al2O3溶胶，通过溶胶-凝胶法制备了掺Er3 +的Al2O3粉末。给出了在550至1250摄氏度的烧结温度下掺杂浓度最高为20 mol％的Er掺杂Al-O系统的相含量图。检测到（Al，Er）（2）O-3相的不同晶体类型-γ，θ，α-和两个Er-Al-O相-ErAlO3和Al10Er6O24-。 Al2O3相中的Er3 +掺杂对γ-> theta和theta-> alpha的相变具有重大影响，表明γ和theta相的稳定性得到增强。与γ-Al2 O 3相相比，可以在高达约1100℃的高温下获得γ-（Al，Er）（2）O-3相。在高Er3 +掺杂浓度下，仍在1200℃下观察到theta-（Al，Er）（2）O-3相以及α-（Al，Er）（2）O-3相。 Er3 +掺杂抑制了γ相和θ相的结晶。在约2至5 mol％的低Er3 +掺杂浓度下，ErAlO3相在1100℃左右析出。在所有烧结温度下均观察到Al10Er6O24相；随着烧结温度升高至约1200℃，沉淀进行到所有Er3 +掺杂浓度。 [参考：17]

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