Thermal-Driven Fluorite-Pyrochlore-Fluorite Phase Transitions of Gd2Zr2O7 Ceramics Probed in Large Range of Sintering Temperature
Thermal-Driven Fluorite-Pyrochlore-Fluorite Phase Transitions of Gd2Zr2O7 Ceramics Probed in Large Range of Sintering Temperature
复制标题
大范围烧结温度下 Gd2Zr2O7 陶瓷热驱动萤石-烧绿石-萤石相变的探讨
DOI：
10.1007/s11661-015-3234-4
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发表时间：
2016
影响因子：
2.8
通讯作者：
Lu Tiecheng
中科院分区：
文献类型：
--
作者：
Zhou Li;Huang Zhangyi;Qi Jianqi;Feng Zhao;Wu Dengxue;Zhang Wei;Yu Xiaohe;Guan Yongbing;Chen Xingtao;Xie L;ong;Sun Kai;Lu Tiecheng
利用X射线衍射、红外光谱和拉曼光谱研究了Gd_2Zr_2O_7在573 ~ 1873 K（300 ~ 1600 ° C）的萤石（F）-焦绿石（P）-萤石（F）相变。低温F相可以在1523 K（1250 °C）以下稳定存在，F-P转变发生在1523 K ~ 1573 K（1250 °C ~ 1300 °C）。P相的有序化过程在1573 ~ 1773 K（1300 ~ 1500 °C）形成，有序度随烧结温度和保温时间的增加而增加。从P到F的高温相变发生在1773 K和1823 K之间（1300 °C和1550 °C）。具有不同有序度的样品的IR光谱在510 cm−1处显示出有趣的位移。拉曼光谱表明，只有A1 g模在F相和P相之间有明显的变化。这种有序度和相变温度的研究将允许一个更有针对性的实验优化Gd 2 Zr 2 O 7用于核废料主机，热障涂层，固体氧化物燃料电池。
Fluorite (F)–pyrochlore (P)–fluorite (F) phase transitions of Gd2Zr2O7were investigated from 573 K to 1873 K (300 °C to 1600 °C), by means of X-ray diffraction, infrared spectra (IR), and Raman spectra. The low-temperature F phase can stably exist below 1523 K (1250 °C) and the F–P transition occurs at 1523 K to 1573 K (1250 °C to 1300 °C). The ordering process of P phase forms at 1573 K to 1773 K (1300 °C to 1500 °C) and the ordering degree increases with increasing sintering temperature and heat preservation period. High-temperature phase transition from P to F occurs between 1773 K and 1823 K (1300 °C and 1550 °C). IR spectra of samples with different ordering degrees show an interesting shift at 510 cm−1. Raman spectra show that only the A1gmode displays a significant change between F and P phases. This ordering degree and phase transition temperature studies would allow a more targeted experimental optimization of Gd2Zr2O7to use in nuclear waste host, thermal barrier coatings, and solid oxide fuel cells.