Synthesis, characterization and lattice thermal expansion of some compounds in the system Gd2CexZr2−xO7
Synthesis, characterization and lattice thermal expansion of some compounds in the system Gd2CexZr2−xO7
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DOI：
10.1016/j.jallcom.2004.06.094
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发表时间：
2005-03
影响因子：
6.2
通讯作者：
S. J. Patwe;B. Ambekar;A. K. Tyagi
中科院分区：
文献类型：
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作者：
S. J. Patwe;B. Ambekar;A. K. Tyagi
本文报道了Gd 2 O3-CeO 2-ZrO 2系统中Gd 2CexZr 2 − xO 7化合物的合成、表征和晶格热膨胀研究。通过粉末XRD对产物进行了表征，并测定了产物的相纯度和晶胞参数。结果表明，Ce ~（4+）仅5mol%溶解在Gd_2Zr_2O_7晶格中。Ce ~（4+）的进一步加入导致了在很宽的组成范围内形成萤石型相，即从Gd_2Ce_0.2Zr_1.8O_7到Gd_2Ce_1.7Zr_0.3O_7。进一步极端的富Ce 4+组合物显示C型立方相的形成。在20-1200°C温度范围内，用HT-XRD研究了该系列端元和Gd2Ce0.1Zr1.9O7的晶格热膨胀。Gd 2 Zr 2 O 7的晶格热膨胀系数为11.6（5）× 10−6C− 1，Gd2Ce0.1Zr1.9O7的晶格热膨胀系数为11.4（5）× 10−6C− 1，Gd 2Ce 2 O 7的晶格热膨胀系数为13.8（5）× 10−6C− 1。
Synthesis, characterization and lattice thermal expansion studies of compounds formed in the Gd2O3–CeO2–ZrO2system with general stoichiometry Gd2CexZr2−xO7is being reported. The products obtained were characterized by powder XRD for phase purity and the unit cell parameters determination. It was observed that only 5mol% of Ce4+is soluble in the lattice of Gd2Zr2O7. Further addition of Ce4+leads to the formation of fluorite-type phase over a wide range of compositions, i.e. from Gd2Ce0.2Zr1.8O7to Gd2Ce1.7Zr0.3O7. The further extreme Ce4+rich compositions show the formation of C-type cubic phase. The lattice thermal expansion studies for the end members of the series and Gd2Ce0.1Zr1.9O7were carried out by HT-XRD in the temperature range 20–1200°C. The coefficients of lattice thermal expansion are 11.6(5) × 10−6C−1for Gd2Zr2O7, 11.4(5) × 10−6C−1for Gd2Ce0.1Zr1.9O7and 13.8(5) × 10−6C−1for Gd2Ce2O7.