"Cs-tetra-ferri-annite:" High-pressure and high-temperature behavior of a potential nuclear waste disposal phase

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dc.contributor.author Comodi, Paola
dc.contributor.author Zanazzi, Pier Francesco
dc.contributor.author Weiss, Zdeněk
dc.contributor.author Rieder, Milan
dc.contributor.author Drábek, Milan
dc.date.accessioned 2007-08-07T12:39:58Z
dc.date.available 2007-08-07T12:39:58Z
dc.date.issued 1999
dc.identifier.citation American mineralogist : an international journal of earth and planetary materials. 1999, vol. 84, no. 3, p. 325–332. en
dc.identifier.issn 0003-004X
dc.identifier.uri http://hdl.handle.net/10084/61579
dc.language.iso en en
dc.publisher Mineralogical Society of America en
dc.relation.ispartofseries American mineralogist : an international journal of earth and planetary materials en
dc.relation.uri http://www.minsocam.org/msa/AmMin/TOC/Articles_Free/1999/Comodi_p325-332_99.pdf en
dc.title "Cs-tetra-ferri-annite:" High-pressure and high-temperature behavior of a potential nuclear waste disposal phase en
dc.type Article en
dc.identifier.location Není ve fondu ÚK en
dc.description.abstract-en Structure deformations induced by pressure and temperature in synthetic "Cs-tetra-ferriannite" 1M [Cs1.78(Fe21 5.93Fe31 0.07)(Si6.15 Fe31 1.80Al0.05)O20(OH)4], space group C2/m, were analyzed to investigate the capability of the mica structure to store the radiogenic isotopes 135Cs and 137Cs. ‘‘Cs-tetra-ferri-annite’’ is not a mineral name, but for the sake of brevity is used here to designate a synthetic analog of the mineral tetra-ferri-annite. The bulk modulus and its pressure derivative determined by fitting the unit-cell volumes between 0 and 47 kbar to a third-order Birch-Murnaghan equation of state are K0 5 257(8) kbar and K09 5 21(1), respectively. Between 23 8C and 582 8C, the a and b lattice parameters remain essentially unchanged, but the thermal expansion coefficient of the c axis is ac 5 3.12(9) 3 1025 8C21. High pressure (P) and high temperature (T) produce limited internal strain in the structure. The tetrahedral rotation angle, a, is very small and does not change significantly throughout the P and T range investigated. Above 450 8C in air, ‘‘Cs-tetraferri- annite’’ underwent an oxidation of octahedral iron in the M2cis site, balanced by the loss of H and shown by a decrease of the unit-cell volume. Independent isobaric data on thermal expansion and isothermal compressibility data define the ‘‘geometric’’ equation of state for ‘‘Cs-tetra-ferri-annite’’: V/V0 5 1 1 3.0(1) 1025 T 2 2.68(9) 1023 P 1 2.0(2) 3 1025 P2 where T is in degrees Celsius, P is in kilobars. The a/b ratio of about 12 bar/8C indicate that the cell volume of ‘‘Cs-tetra-ferri-annite’’ remains unchanged under geothermal gradients of ;23 8C/km. On the whole, the data confirm that the structure of ‘‘Cs-tetra-ferri-annite’’ may be a suitable candidate for the storage of large ions, such as Cs in the interlayer and should be considered as a potential Synroc component. en
dc.identifier.wos 000078741000016

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  • Publikační činnost VŠB-TUO / Publications of VŠB-TUO [1943]
    Kolekce obsahuje bibliografické záznamy publikační činnosti (článků) akademických pracovníků VŠB-TUO v časopisech (a v Lecture Notes in Computer Science) registrovaných ve Web of Science od roku 1990 po současnost.

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