Physics and Chemistry of Minerals
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Defect properties of albite
Physics and Chemistry of Minerals - Tập 35 - Trang 129-135 - 2007
Knowledge of the defect properties of Lunar and Mercurian minerals has recently become important, with the advent of models which attempt to explain the formation of the thin exosphere of these celestial bodies. Here, we have calculated the formation energies of sodium and oxygen vacancies in the mineral albite (NaAlSi3O8), as well as the Schottky defect energy for the removal of a Na2O unit. We h...... hiện toàn bộ
Stability at high pressure, elastic behavior and pressure-induced structural evolution of “Al5BO9”, a mullite-type ceramic material
Physics and Chemistry of Minerals - Tập 37 - Trang 227-236 - 2009
Elastic behavior and pressure-induced structural evolution of synthetic boron-mullite “Al5BO9” (a = 5.678(2) Å, b = 15.015(4) Å and c = 7.700(3) Å, space group Cmc21, Z = 4) were investigated up to 7.4 GPa by in situ single-crystal X-ray diffraction with a diamond anvil cell under hydrostatic conditions. No phase transition or anomalous compressional behavior occurred within the investigated P ran...... hiện toàn bộ
Perrierite-(Ce) from the Laacher See tephra, Eifel, Germany, and the modular character of the chevkinite group of minerals
Physics and Chemistry of Minerals - Tập 48 - Trang 1-14 - 2021
Perrierite-(Ce) crystals from ejecta of the Laacher See volcano, Eifel, in Germany were studied by X-ray single-crystal diffraction and electron microprobe analysis. The composition and crystal structure of this sample is discussed in relation to the known properties of the chevkinite group minerals and related synthetic compounds. Taking into account the modular character of the chevkinite minera...... hiện toàn bộ
Single-crystal Raman spectra of YAlO3 and GdAlO3: comparison to several orthorhombic ABO3 perovskites
Physics and Chemistry of Minerals - Tập 38 - Trang 709-726 - 2011
Room-temperature-polarized single-crystal Raman spectra have been measured for both GdAlO3 and YAlO3. Both aluminates crystallize in the orthorhombic (Pbnm) perovskite structure. Of the 24 possible Raman modes in 4 symmetries, 20 and 17 modes were observed for gadolinium and yttrium aluminates, respectively. Comparisons of the Raman spectra of these two aluminates to those of 28 other orthorhombic...... hiện toàn bộ
First-principles-based calculations of the CaCO3–MgCO3 and CdCO3–MgCO3 subsolidus phase diagrams
Physics and Chemistry of Minerals - Tập 30 - Trang 88-97 - 2003
Planewave pseudopotential calculations of supercell total energies were used as bases for first-principles calculations of the CaCO3–MgCO3 and CdCO3–MgCO3 phase diagrams. Calculated phase diagrams are in qualitative to semiquantitative agreement with experiment. Two unobserved phases, Cd3Mg (CO3)4 and CdMg3(CO3)4, are predicted. No new phases are predicted in the CaCO3–MgCO3 system, but a low-lyi...... hiện toàn bộ
Effect of high-low quartz transition on compressional and shear wave velocities in rocks under high pressure
Physics and Chemistry of Minerals - Tập 4 Số 2 - Trang 161-171 - 1979
The compressional and shear wave velocities in quarzite, granite, and granulite are determined at a fixed confining pressure of 2 kb as a function of temperature up to 720° C. The high-low quartz transition of the constituent quartz minerals is associated with a pronounced decrease in velocity of the compressional waves when approaching the transition and with a significant velocity increase after...... hiện toàn bộ
The distribution of Fe3+ and Ga3+ between two tetrahedral sites in melilites, Ca2(Mg, Fe3+, Ga, Si)3O7
Physics and Chemistry of Minerals - Tập 13 - Trang 152-155 - 1986
The distribution of Fe3+ and Ga3+ between the two tetrahedral sites in three synthetic melilites has been studied by using 57Fe Mössbauer spectroscopy. In the melilite, (Ca2Ga2SiO7)50 (Ca2Fe3+GaSiO7)50 (mol %), the distribution of Fe3+ and Ga3+ in T1 and T2 sites is apparently random, which can be explained in terms of the electrostatic valence rule. However in the melilites, (Ca2MgSi2O7)52 (Ca2Fe...... hiện toàn bộ
A structural study of cyanotrichite from Dachang by conventional and automated electron diffraction
Physics and Chemistry of Minerals - Tập 42 - Trang 651-661 - 2015
The crystal structure of cyanotrichite, having general formula Cu4Al2(SO4)(OH)12·2H2O, from the Dachang deposit (China) was studied by means of conventional transmission electron microscopy, automated electron diffraction tomography (ADT) and synchrotron X-ray powder diffraction (XRPD). ADT revealed the presence of two different cyanotrichite-like phases. The same phases were also recognized in th...... hiện toàn bộ
Molecular dynamics study of the crystal structure and phase relation of the GeO 2 polymorphs
Physics and Chemistry of Minerals - - 1998
Muscovite surface structure imaged by fluid contact mode AFM
Physics and Chemistry of Minerals - Tập 26 - Trang 198-205 - 1999
The surface structure of muscovite was imaged using an atomic force microscope (AFM) in contact mode in water. The following three types of AFM images were observed: (1) those showing clearly the arrangement of hexagonal rings of SiO4 tetrahedra; (2) those showing a hexagonal array of bright spots separated by a distance of about 5.3 Å; and (3) those changing gradually from image (2) to image (1)....... hiện toàn bộ
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