光谱学与光谱分析
γ -Al2 O3 高温相变的XRD和Raman光谱比较研究
方萍，何迈，谢云龙，罗孟飞*
浙江师范大学物理化学研究所，浙江省固体表面反应化学重点实验室，浙江 金华 321004
XRD and Raman Spectroscopic Comparative Study on Phase Transformation of γ -Al2 O3 at High Temperature
FANG Ping, HE Mai, XIE Yun-long, LUO Meng-fei*
Institute of Physical Chemistry, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Zhejiang Normal University, Jinhua 321004, China
摘要 ： 采用XRD和Raman光谱研究了γ -Al2 O3 的高温相变。Raman结果表明，位于1 175，1 241 cm-1 和1 370，1 400 cm-1 的2组谱峰是杂质Fe3+ 和(或)Cr3+ 在θ -Al2 O3 和α -Al2 O3 环境中产生的荧光光谱，用这2组峰来指认θ -Al2 O3 和α -Al2 O3 物相比XRD更灵敏。因此，Raman技术能高灵敏地表征γ -Al2 O3 的高温相变过程。结果表明γ -Al2 O3 从800 ℃开始发生相变，γ -Al2 O3 同时向θ -Al2 O3 和α -Al2 O3 转变，随着温度的升高最终完全转变成α -Al2 O3 。相变温度与样品本身有关。
关键词 ：Al2 O3 ;高温相变;XRD;Raman光谱
Abstract ：The phase transformation of γ -Al2 O3 at high temperature was characterized by XRD and Raman techniques. Raman results show that under the excitation at 632.8 nm, the Raman shift bands at 1 175 and 1 241 cm-1 and the other two bands at 1 370 and 1 400 cm-1 are attributed to the Cr3+ and (or) Fe3+ fluorescence bands in θ -Al2 O3 and α -Al2 O3 environments respectively. Compared with XRD measurements, it is more sensitive to use these two groups of Raman bands to estimate the phase formation and transformation of θ -Al2 O3 and α -Al2 O3 . Therefore, Raman spectroscopy can deduce the high temperature phase transformation effectively. Experiments results show that γ -Al2 O3 starts to transform to θ -Al2 O3 and α -Al2 O3 synchronously at 800 ℃, but the nature of the sample determines the final temperature of transforming to α -Al2 O3 .
Key words ：Al2 O3 ;Phase transformation;XRD;Raman spectroscopy
收稿日期: 2005-07-27
修订日期: 2005-11-02
通讯作者:
罗孟飞
引用本文:
方萍，何迈，谢云龙，罗孟飞* . γ -Al2 O3 高温相变的XRD和Raman光谱比较研究 [J]. 光谱学与光谱分析, 2006, 26(11): 2039-2042.
* . XRD and Raman Spectroscopic Comparative Study on Phase Transformation of γ -Al2 O3 at High Temperature. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(11): 2039-2042.
链接本文:
https://www.gpxygpfx.com/CN/Y2006/V26/I11/2039
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