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      Self-propagating high-temperature synthesis of ZrO 2 incorporated Gd 2Ti 2O 7 pyrochlore

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          Abstract

          In this research, Zr-doped Gd 2Ti 2O 7 pyrochlores, with the composition of Gd 2(Ti 1- x Zr x ) 2O 7, were firstly synthesized by self-propagating high-temperature synthesis plus quick pressing (SHS/QP) using CuO as the oxidant and Ti as the reductant. To improve the radiation resistance of titanate–pyrochlore, up to 35 at% Zr was incorporated to substitute the Ti site of Gd 2Ti 2O 7 pyrochlore (Gd 2(Ti 0.75Zr 0.35) 2O 7). XRD and SEM microstructural characterizations showed the formation of a composite ceramic with the major pyrochlore phase and the minor Cu phase. The generated temperature of samples decreased from 1702 to 1011 ℃ with increasing Zr content. The effects of sintering temperature and pressure time on phase composition and microstructure were systematically studied. Besides, the influence of thermal transmission on the whole combustion process was also explored. The pyrochlore-based waste form possessed high bulk density of 6.25 g/cm 3 and Vickers hardness of 10.81 GPa. The MCC-1 leaching test showed the normalized elemental leaching rates (42 d) of Cu, Gd, and Zr are 1.27×10 -2, 1.33×10 -3, and 8.44×10 -7 g·m -2·d -1, respectively.

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          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 March 2018
          : 07
          : 01
          : 41-49
          Affiliations
          [ a ] State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
          [ b ] Science and Technology on Surface Physics and Chemistry Laboratory, China Academy of Engineering Physics, Mianyang, Sichuan 621907, China
          [ c ] Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
          Author notes
          * Corresponding author. E-mail: xiaobao320@ 123456163.com
          Article
          2226-4108-07-01-41
          10.1007/s40145-017-0254-0

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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