(1. Crystal Structure and Chemistry Laboratory, Science Research Institute, China University of Geoscience (Beijing), 2. State Key Laboratory for Geological Processes and Mineral Resources, China University of Geoscience,
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DOI:
10.7502/j.issn.1674-3962.2016.07.02
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Abstract:
Pyrochlore- and hollandite-type minerals were extensively investigated as the nuclear waste-forms, showing the unique properties on thermal and chemical stabilities and irradiation resistance. In the past decade, our group methodically studied the crystal structure and chemistry of pyrochlore- and holladnite-type natural minerals and their synthesized compounds. According to X-ray diffraction analysis of fourteen synthesized rare-earth pyrochlore (Ree2B2O7, B=Ti, Zr), both Ree2Ti2O7 and Ree2Zr2O7 show obvious crystal structure variable. The study of hollandite crystal structure indicates that contents of cation A (A0-2B8O16, A=Na, K, Sr, Ba, etc., B=Ti, Fe, Mn, Al, etc.) in the tunnel and parameters regarding anisotropy usually cause one-dimension incommensurate modulation structure along with c direction. This paper summarized our recent results on their structure and chemistry, and reviewed the research and development of their application in nuclear waste immobilization.