Browsing by Author "Redfern S.A.T."
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Browsing by Author "Redfern S.A.T."
Now showing items 1-20 of 22
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Archer T.D.; Birse S.E.A.; Dove M.T.; Redfern S.A.T.; Gale J.D.; Cygan R.T. (2003)An empirical model for investigating the behaviour of CaCO3 polymorphs incorporating a shell model for oxygen has been created. The model was constructed by fitting to: the structure of aragonite and calcite; their elastic, ...
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Palin E.J.; Dove M.T.; Redfern S.A.T.; Saniz-Diaz C.I.; Lee W.T. (2003)As part of a wider study of the nature and origins of cation order-disorder in micas, a variety of computational techniques have been used to investigate the nature of tetrahedral and octahedral ordering in phengite, ...
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Palin E.J.; Dove M.T.; Redfern S.A.T.; Bosenick A.; Sainz-Diaz C.I.; Warren M.C. (2001)The nature of Al–Si ordering across the tetrahedral sites in muscovite, K2Al4(Si6Al2O20)(OH)4, was investigated using various computational techniques. Values of the atomic exchange interaction parameters J l were obtained. ...
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DEHYDROXYLATION AND CO2 INCORPORATION IN ANNEALED MICA (SERICITE): AN INFRARED SPECTROSCOPIC STUDY Zhang M.; Redfern S.A.T.; Salje E.K.H.; Wang L.; Hirai S. (2005)Dehydroxylation and incorporation of CO2 in mica (sericite-2M1) during high-temperature annealing has been investigated in detail using infrared (IR) spectroscopy. The dehydroxylation is characterized by a dramatic change ...
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Wang L.; Zhang M.; Redfern S.A.T.; Zhang Z. (2002)The thermally-induced dehydroxylation and transformations of the 2:1 phyllosilicate pyrophyllite have been studied using infrared spectroscopy in the frequency range 350 11000 cm 1 and the temperature range 200 1500°C. ...
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Meyer H.W.; Carpenter M.A.; Redfern S.A.T.; Dove M.T.; Marion S.; Sondergeld P.; Knight K.S. (2001)The phase transitions in deuterated lawsonite were investigated with high-resolution, time-of-flight neutron diffraction between 2 and 500 K. From the analysis of spontaneous strain data, the thermodynamics of the phase ...
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Redfern S.A.T.; Angel R.J. (1999)The high-pressure response of the cell parameters of calcite, CaCO3, has been investigated by single crystal X-ray diffraction. The unit cell parameters have been refined from 0 to 1.435 GPa, and the linear and volume ...
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Reece J.J.; Redfern S.A.T. (2004)Abstract The magnetic susceptibility of ordered and partially disordered manganogrunerites (composition Ca0.1Mn1.9Mg1.25Fe3.562+Fe0.383+Si7.81O22(OH)2 and Ca0.24Mn1.57Mg2.27Fe2.762+Fe0.323+Si7.84O22(OH)2) has been measured ...
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Wang L.; Zhang M.; Redfern S.A.T. (2003)We report infrared spectroscopic observations of the incorporation of CO2 into pyrophyllite that has been heated between 200ºC and 1250ºC for periods of 15 min, 1 h and 5 days. The presence of CO2 is characterized by the ...
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Mookherjee M.; Redfern S.A.T.; Swainson I.; Harlov D.E. (2004)The behaviour of the ammonium ion in synthetic buddingtonite, N(D,H)4AlSi3O8, has been studied by infrared (IR) spectroscopy from 20K to 298K and by 2H NMR spectroscopy from 120K to 298K. IR spectra were collected from 500 ...
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Reece J.J.; Redfern S.A.T.; Welch M.D.; Henderson C.M.B. (2000)The crystal structure of a manganoan cummingtonite, composition ([M4])(Na0.13Ca0.41Mg0.46Mn1.00) 102,614(2)(n) from Talcville, New York, has been refined at high temperature using in situ neutron powder diffraction. The ...
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Le Godec Y.; Dove M.T.; Francis D.J.; Kohn S.C.; Marshall W.G.; Pawley A.R.; Price G.D.; Redfern S.A.T.; Rhodes N.; Ross N.L.; Schofield P.F.; Schooneveld E.; Syfosse G.; Tucker M.G.; Welch M.D. (2001)The commissioning and operation of apparatus for neutron diffraction at simultaneous high temperatures and pressures is reported. The basic design is based on the Paris-Edinburgh cell using opposed anvils, with internal ...
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Redfern S.A.T. (2000)Cation ordering is often one of the most efficient ways a mineral can adapt to changing temperature or chemical composition. Disorder of distinct species across different crystallographic sites at high temperature provides ...
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Harrison R.J.; Redfern S.A.T.; Bismayer U. (2004)The low-frequency mechanical properties of pure and Ca-doped lead orthophosphate, (Pb1–xCax)3(PO4)2, have been studied using simultaneous dynamical mechanical analysis, X-ray diffraction (XRD), and optical video microscopy ...
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Harrison R.J.; Redfern S.A.T. (2001)Magnetic and cation ordering in the ilmenite-hematite solid solution (FeTiO3–Fe2O3) has been studied using in-situ high-temperature time-of-flight neutron powder diffraction. Synthetic samples containing 60 and 65% FeTiO3 ...
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Ovchinnikov N.O.; Nikitina L.P.; Babushkina M.S.; Yakovleva A.K.; Yakovlev Yu.N.; Chernova O.G.; Redfern S.A.T. (2002)Trioctahedral ferromagnesium micas from the Archaean amphibolites of the Kola super-deep borehole (KSDB-3) complex have been compared with those from analogous Archaean surface rocks in an integrated study of their chemical ...
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Redfern S.A.T. (2000)
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Méducin F.; Redfern S.A.T.; Stone H.J.; Tucker M.G.; Dove M.T.; Le Godec Y.; Marshall W.G. (2004)The temperature-dependence of the cation distribution in synthetic spinel (MgAl2O4) was investigated using in situ time-of-flight neutron powder diffraction at ISIS, the pulsed-neutron source at the Rutherford Appleton ...
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Reece J.J.; Redfern S.A.T.; Welch M.D.; Henderson C.M.B.; McCammon C.A. (2002)The partitioning of Fe and Mn between the large M(4) site and the octahedral sites, M(1,2,3) in the amphibole structure has been investigated in two natural manganogrunerites of compositions Ca0.1Mn1.9 Mg1.25Fe2+ 3.56Fe3+ ...
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Harrison R.J.; Redfern S.A.T.; Street J. (2003)The low-frequency mechanical properties of polycrystalline Ca1-xSrxTiO3 (0.5 ≤ x ≥ 0.9) have been investigated as a function of temperature and bulk composition using the technique of dynamical mechanical analysis in ...
Now showing items 1-20 of 22