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Preparation of Optimized Uranium and Thorium Bearing Brabantite or Monazite/Brabantite Solid Solutions

The simultaneous incorporation of thorium and uranium(IV) in the rare‐earth orthophosphates from a mixture of powdered AnO2, (NH4)(H2PO4), and Ca(HPO4)·2H2O was successfully performed, leading to the formation of single‐phase Th‐brabantite (Ca0.5Th0.5PO4), U‐brabantite (Ca0.5U0.5PO4), and (Th,U)‐bra...

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Published in:Journal of the American Ceramic Society 2008-11, Vol.91 (11), p.3673-3682
Main Authors: Terra, Olivier, Dacheux, Nicolas, Clavier, Nicolas, Podor, Renaud, Audubert, Fabienne
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cited_by cdi_FETCH-LOGICAL-c5108-55733c582f0277ec15cb265cb3976efb65d54700d6703c5ba5927bceddfc1cb73
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description The simultaneous incorporation of thorium and uranium(IV) in the rare‐earth orthophosphates from a mixture of powdered AnO2, (NH4)(H2PO4), and Ca(HPO4)·2H2O was successfully performed, leading to the formation of single‐phase Th‐brabantite (Ca0.5Th0.5PO4), U‐brabantite (Ca0.5U0.5PO4), and (Th,U)‐brabantites (Ca0.5Th0.5−yUyPO4). The repetition of several cycles composed of a grinding step (30 Hz, 15 min) and of a heat treatment (T=1200°C, 10 h, Ar atmosphere) allowed preparation of single‐phase and homogeneous compounds. The complete characterization of the samples by the means of X‐Ray powder diffraction, electron probe microanalyses, and μ‐Raman spectrometry did not reveal either the presence of minor phases or the partial oxidation of uranium(IV) into uranyl. This study also evidenced the formation of a complete Ca0.5Th0.5−yUyPO4 solid solution with the associated linear decrease of a, b, and c unit cell parameters and β increase versus the uranium mole loading. Even if the samples were found to be single phase, the significant improvement of the cation distribution in the materials was reached by the mean of the repetition of grinding/heating cycles. The same solid‐state process was applied with success to the preparation of homogeneous and single‐phase (Th,U)‐monazite/brabantite solid solutions with general formula Ln1−2xCaxThx−yUyPO4 (with 0.1≤x≤0.4 and y=x/5).
doi_str_mv 10.1111/j.1551-2916.2008.02678.x
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The repetition of several cycles composed of a grinding step (30 Hz, 15 min) and of a heat treatment (T=1200°C, 10 h, Ar atmosphere) allowed preparation of single‐phase and homogeneous compounds. The complete characterization of the samples by the means of X‐Ray powder diffraction, electron probe microanalyses, and μ‐Raman spectrometry did not reveal either the presence of minor phases or the partial oxidation of uranium(IV) into uranyl. This study also evidenced the formation of a complete Ca0.5Th0.5−yUyPO4 solid solution with the associated linear decrease of a, b, and c unit cell parameters and β increase versus the uranium mole loading. Even if the samples were found to be single phase, the significant improvement of the cation distribution in the materials was reached by the mean of the repetition of grinding/heating cycles. The same solid‐state process was applied with success to the preparation of homogeneous and single‐phase (Th,U)‐monazite/brabantite solid solutions with general formula Ln1−2xCaxThx−yUyPO4 (with 0.1≤x≤0.4 and y=x/5).</description><identifier>ISSN: 0002-7820</identifier><identifier>EISSN: 1551-2916</identifier><identifier>DOI: 10.1111/j.1551-2916.2008.02678.x</identifier><identifier>CODEN: JACTAW</identifier><language>eng</language><publisher>Malden, USA: Blackwell Publishing Inc</publisher><subject>Applied sciences ; Building materials. Ceramics. 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The repetition of several cycles composed of a grinding step (30 Hz, 15 min) and of a heat treatment (T=1200°C, 10 h, Ar atmosphere) allowed preparation of single‐phase and homogeneous compounds. The complete characterization of the samples by the means of X‐Ray powder diffraction, electron probe microanalyses, and μ‐Raman spectrometry did not reveal either the presence of minor phases or the partial oxidation of uranium(IV) into uranyl. This study also evidenced the formation of a complete Ca0.5Th0.5−yUyPO4 solid solution with the associated linear decrease of a, b, and c unit cell parameters and β increase versus the uranium mole loading. Even if the samples were found to be single phase, the significant improvement of the cation distribution in the materials was reached by the mean of the repetition of grinding/heating cycles. The same solid‐state process was applied with success to the preparation of homogeneous and single‐phase (Th,U)‐monazite/brabantite solid solutions with general formula Ln1−2xCaxThx−yUyPO4 (with 0.1≤x≤0.4 and y=x/5).</description><subject>Applied sciences</subject><subject>Building materials. Ceramics. Glasses</subject><subject>Cations</subject><subject>Ceramic industries</subject><subject>Ceramics</subject><subject>Chemical compounds</subject><subject>Chemical industry and chemicals</subject><subject>Chemical Physics</subject><subject>Diffraction</subject><subject>Electron probes</subject><subject>Exact sciences and technology</subject><subject>Miscellaneous</subject><subject>Phases</subject><subject>Physics</subject><subject>Pollution</subject><subject>Radioactive wastes</subject><subject>Rare earth metals</subject><subject>Repetition</subject><subject>Solid solutions</subject><subject>Technical ceramics</subject><subject>Thorium</subject><subject>Uranium</subject><subject>Wastes</subject><issn>0002-7820</issn><issn>1551-2916</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNqNkUFv1DAQhSMEEkvhP0RIICSU7diO4-SEtqvSUgUK6lYcR47jUC_ZONgJbPvrcZpqhTggfBg_2988jfWiKCawJGEdb5eEc5LQgmRLCpAvgWYiX-4fRYvDw-NoAQA0ETmFp9Ez77fhSIo8XUTNZ6d76eRgbBfbJr7sB7Mzd7qOr53szLiLZVfHmxvrJn2ipTPdt_jEyUp2gxl0bF380XbyLujjP66vbGvqqY6Ts38ePWlk6_WLh_0oun5_ulmfJ-Xl2Yf1qkwUJ5AnnAvGFM9pA1QIrQhXFc1CYYXIdFNlvOapAKgzAYGrJC-oqJSu60YRVQl2FL2dfW9ki70zO-lu0UqD56sSTUd7hgCMC87SnyTQr2e6d_bHqP2AO-OVblvZaTt6ZCmDgqUQwDf_BMPslEIApwle_oVu7ei68GmkRBRplgMLUD5DylnvnW4OsxLAKVbc4pQeTunhFCvex4r70PrqwV96JdsmpKSMP_RTKCDNWB64dzP3y7T69r_98WK1Pr3XwSGZHYwf9P7gIN13zAQTHL9-OsOLqw0V5Zc1luw3VljDwQ</recordid><startdate>200811</startdate><enddate>200811</enddate><creator>Terra, Olivier</creator><creator>Dacheux, Nicolas</creator><creator>Clavier, Nicolas</creator><creator>Podor, Renaud</creator><creator>Audubert, Fabienne</creator><general>Blackwell Publishing Inc</general><general>Wiley</general><general>Wiley Subscription Services, Inc</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-8103-1743</orcidid><orcidid>https://orcid.org/0000-0003-1636-1313</orcidid><orcidid>https://orcid.org/0000-0003-1034-1186</orcidid><orcidid>https://orcid.org/0000-0001-8010-2661</orcidid></search><sort><creationdate>200811</creationdate><title>Preparation of Optimized Uranium and Thorium Bearing Brabantite or Monazite/Brabantite Solid Solutions</title><author>Terra, Olivier ; Dacheux, Nicolas ; Clavier, Nicolas ; Podor, Renaud ; Audubert, Fabienne</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5108-55733c582f0277ec15cb265cb3976efb65d54700d6703c5ba5927bceddfc1cb73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Applied sciences</topic><topic>Building materials. Ceramics. Glasses</topic><topic>Cations</topic><topic>Ceramic industries</topic><topic>Ceramics</topic><topic>Chemical compounds</topic><topic>Chemical industry and chemicals</topic><topic>Chemical Physics</topic><topic>Diffraction</topic><topic>Electron probes</topic><topic>Exact sciences and technology</topic><topic>Miscellaneous</topic><topic>Phases</topic><topic>Physics</topic><topic>Pollution</topic><topic>Radioactive wastes</topic><topic>Rare earth metals</topic><topic>Repetition</topic><topic>Solid solutions</topic><topic>Technical ceramics</topic><topic>Thorium</topic><topic>Uranium</topic><topic>Wastes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Terra, Olivier</creatorcontrib><creatorcontrib>Dacheux, Nicolas</creatorcontrib><creatorcontrib>Clavier, Nicolas</creatorcontrib><creatorcontrib>Podor, Renaud</creatorcontrib><creatorcontrib>Audubert, Fabienne</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Hyper Article en Ligne (HAL)</collection><jtitle>Journal of the American Ceramic Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Terra, Olivier</au><au>Dacheux, Nicolas</au><au>Clavier, Nicolas</au><au>Podor, Renaud</au><au>Audubert, Fabienne</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Preparation of Optimized Uranium and Thorium Bearing Brabantite or Monazite/Brabantite Solid Solutions</atitle><jtitle>Journal of the American Ceramic Society</jtitle><date>2008-11</date><risdate>2008</risdate><volume>91</volume><issue>11</issue><spage>3673</spage><epage>3682</epage><pages>3673-3682</pages><issn>0002-7820</issn><eissn>1551-2916</eissn><coden>JACTAW</coden><abstract>The simultaneous incorporation of thorium and uranium(IV) in the rare‐earth orthophosphates from a mixture of powdered AnO2, (NH4)(H2PO4), and Ca(HPO4)·2H2O was successfully performed, leading to the formation of single‐phase Th‐brabantite (Ca0.5Th0.5PO4), U‐brabantite (Ca0.5U0.5PO4), and (Th,U)‐brabantites (Ca0.5Th0.5−yUyPO4). The repetition of several cycles composed of a grinding step (30 Hz, 15 min) and of a heat treatment (T=1200°C, 10 h, Ar atmosphere) allowed preparation of single‐phase and homogeneous compounds. The complete characterization of the samples by the means of X‐Ray powder diffraction, electron probe microanalyses, and μ‐Raman spectrometry did not reveal either the presence of minor phases or the partial oxidation of uranium(IV) into uranyl. This study also evidenced the formation of a complete Ca0.5Th0.5−yUyPO4 solid solution with the associated linear decrease of a, b, and c unit cell parameters and β increase versus the uranium mole loading. Even if the samples were found to be single phase, the significant improvement of the cation distribution in the materials was reached by the mean of the repetition of grinding/heating cycles. The same solid‐state process was applied with success to the preparation of homogeneous and single‐phase (Th,U)‐monazite/brabantite solid solutions with general formula Ln1−2xCaxThx−yUyPO4 (with 0.1≤x≤0.4 and y=x/5).</abstract><cop>Malden, USA</cop><pub>Blackwell Publishing Inc</pub><doi>10.1111/j.1551-2916.2008.02678.x</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-8103-1743</orcidid><orcidid>https://orcid.org/0000-0003-1636-1313</orcidid><orcidid>https://orcid.org/0000-0003-1034-1186</orcidid><orcidid>https://orcid.org/0000-0001-8010-2661</orcidid></addata></record>
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ispartof Journal of the American Ceramic Society, 2008-11, Vol.91 (11), p.3673-3682
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subjects Applied sciences
Building materials. Ceramics. Glasses
Cations
Ceramic industries
Ceramics
Chemical compounds
Chemical industry and chemicals
Chemical Physics
Diffraction
Electron probes
Exact sciences and technology
Miscellaneous
Phases
Physics
Pollution
Radioactive wastes
Rare earth metals
Repetition
Solid solutions
Technical ceramics
Thorium
Uranium
Wastes
title Preparation of Optimized Uranium and Thorium Bearing Brabantite or Monazite/Brabantite Solid Solutions
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