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dc.contributor.authorAffholter, Kathleenen
dc.date.accessioned2014-03-14T21:09:25Zen
dc.date.available2014-03-14T21:09:25Zen
dc.date.issued1987-12-15en
dc.identifier.otheretd-02062013-040123en
dc.identifier.urihttp://hdl.handle.net/10919/37332en
dc.description.abstractMetamictization and complex chemistry are major obstacles to the crystal chemical characterization of natural allanites. To overcome these problems, allanites, Ca(REE)Fe²+Al₂Si₃O₁₂(OH), where REE = La, La-Ce, Ce, Nd, Sm, Eu, Gd, Er, Dy, Yb and Y have been synthesized hydrothermally from unbuffered and buffered oxide mixes at 500 to 650°C, 5.5 kbar (550 MPa), and 700 to 725°C, 4 kbar (400 MPa). Although allanite is readily synthesized, high yields are obtained only for allanite-(LREE) compositions, and end"member composition is obtained only for allanite-(La). Er and Yb ions are too small to substitute at the A(2) site in allanite, but a small amount can substitute at the VI~coordinated M(3) site. Fe²+ in the M(3) site favors LREE substitution, which supports the contention that allanite is Ce'selective.en
dc.format.extentviii, 208 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.isformatofOCLC# 17720573en
dc.relation.haspartLD5655.V856_1987.A335.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1987.A335en
dc.subject.lcshAllaniteen
dc.titleSynthesis and crystal chemistry of lanthanide allanitesen
dc.typeDissertationen
dc.contributor.departmentGeological Sciencesen
dc.description.degreePh. D.en
thesis.degree.namePh. D.en
thesis.degree.leveldoctoralen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineGeological Sciencesen
dc.contributor.committeechairHewitt, David A.en
dc.contributor.committeememberBloss, F. Donalden
dc.contributor.committeememberGibbs, Gerald V.en
dc.contributor.committeememberRibbe, Paul H.en
dc.contributor.committeememberSpeer, J. Alexanderen
dc.type.dcmitypeTexten
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02062013-040123/en
dc.date.sdate2013-02-06en
dc.date.rdate2013-02-06en
dc.date.adate2013-02-06en


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