Browsing by Author "Carpenter M.A."
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Browsing by Author "Carpenter M.A."
Now showing items 1-14 of 14
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Carpenter M.A.; Salje E.K.H.; Graeme-Barber A.; Wruck B.; Dove M.T.; Knight K.S. (1998)Spontaneous strains for the alpha ↔ beta transition in quartz were determined from lattice parameter data collected by X-ray powder diffraction and neutron powder diffraction over the temperature range similar to 5-1340 ...
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Camara F.; Carpenter M.A.; Domeneghetti M.Ch.; Tazzoli V. (2003)A Landau potential with linear-quadratic coupling has been developed to describe interactions between a non-convergent order parameter, QOD, for Fe/Mg ordering, and the order parameter, QD, for the C2/c-P21/c phase transition ...
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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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Carpenter M.A.; Salje E.K.H. (1998)Landau theory provides a formal basis for predicting the variations of elastic constants associated with phase transitions in minerals. These elastic constraints can show substantial anomalies as a transition point is ...
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Meyer H.-W.; Carpenter M.A.; Becerro A.I.; Seifert F. (2002)Powder infrared spectra of perovskites across the CaTiO3-SrTiO3 solid solution have been collected at room temperature for the range 20–700 cm−1. Frequency, intensity, and line broadening parameters vary with a pattern ...
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Hayward S.A.; Burriel R.; Marion S.; Meyer H.W.; Carpenter M.A. (2002)The specific heat of natural and deuterated lawsonite, CaAl2Si2O7(OH)(2)(H2O)-H-., has been measured in the temperature ranges 77 K-310 K, using ac calorimetry, and 230 K-320 K, using differential scanning calorimetry. ...
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Camara F.; Doukhan J.C.; Carpenter M.A. (2001)Lattice defects in lawsonite have been studied by transmission electron microscopy. It is proposed that twinning and easy glide systems are 1/2[110].{110}; the easy glide planes are coincident with twin planes. This mineral ...
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Camara F.; Carpenter M.A.; Domeneghetti M.C.; Tazzoli V. (2002)A natural Ca-rich pigeonite (En47Fs43Wo10), free of augite exsolution products, was studied by in situ high-temperature single-crystal X-ray diffraction. The sample, monoclinic P21/c (a=9.719(7) A, b=8.947(9) A, c=5.251(3) ...
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Boffa Ballaran T.; Carpenter M.A.; Domeneghetti M.C. (2001)Natural amphiboles with composition close to the binary join cummingtonite-grunerite and crystals of the same samples annealed at 700 °C for 55.5 h, in order to obtain different degrees of non-convergent cation order, have ...
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Martín-Olalla J.M.; Hayward S.A.; Meyer H.W.; Ramos S.; del Cerro J.; Carpenter M.A. (2001)The specific heat of lawsonite, CaAl2Si2O7(OH)(2).H2O, has been measured in the temperature range 125 K - 325 K. An anomaly is seen at 273 K, which is related to the Cmcm - Pmcn phase transition. The magnitude of the total ...
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SPONTANEOUS STRAIN VARIATIONS THROUGH THE LOW TEMPERATURE PHASE TRANSITIONS OF DEUTERATED LAWSONITE Carpenter M.A.; Meyer H.W.; Sondergeld P.; Marion S.; Knight K.S. (2003)High resolution neutron powder diffraction has been used to determine lattice parameter variations of deuterated lawsonite across the Cmcm ↔ Pmcn and Pmcn ↔ P21cn phase transitions, in the temperature interval 1.6–505 K. ...
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Carpenter M.A.; Bacerro A.I.; Seiferi F. (2001)A single Landau free energy expansion is used to describe phase transitions in perovskites, from a cubic parent structure to tetragonal and orthorhombic structures with space groups related to the M3 and R25 points of the ...
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Tarantino S.C.; Carpenter M.A.; Domeneghetti M.C. (2003)Infrared powder-absorption spectra of nine natural and five synthetic olivine samples across the forsterite-fayalite join have been investigated at room temperature in the range 70-1400 cm-1. Variations of peak positions ...
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Rodehorst U.; Carpenter M.A.; Marion S.; Henderson C.M.B. (2003)Phase transitions in the BaAl2O4-SrAl2O4 solid solution have been analysed as a function of temperature and composition using infrared (IR) powder absorption spectroscopy. The improper ferroelectric phase transition P6322 ...
Now showing items 1-14 of 14