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Thermodynamics of cation ordering in karrooite (MgTi2O5)
MgTi2O5 Thermodynamics cation ordering karrooite
2012/4/1
A thermodynamic model of non-convergent cation-ordering in karrooite (MgTi O ) has been cali-2 5
brated from the single-crystal X-ray structure refinements of Yang and Hazen (1998) and from esti-
ma...
In situ neutron diffraction study of non-convergent cation ordering in the (Fe3O4)1-x(MgAl2O4)x spinel solid solution
non-convergent cation ordering (Fe3O4)1-x(MgAl2O4)x spinel solid solution
2012/3/31
Non-convergent cation ordering in the (Fe O ) (MgAl O ) solid solution was investigated us-
ing in-situ time-of-flight neutron powder diffraction. The approach to equilibrium in a sample with
x = 0...
Thermodynamics and kinetics of cation ordering in MgAl2O4 spinel up to 1600 °C from in situ neutron diffraction
MgAl2O4 temperature to 1600C situ neutron diffraction
2012/3/30
Thetemperaturedependenceofthecationdistributioninsyntheticspinel(MgAl O )was2 4
determinedusingin-situtime-of-?ightneutronpowderdiffraction.Neutrondiffractionpat-
ternsofstoichiometricMgAl
O andsli...
Structural mechanisms of solid solution and cation ordering in augite-jadeite pyroxenes: II. A microscopic perspective
Structural mechanisms augite-jadeite pyroxenes microscopic perspective
2012/3/31
Infrared spectra of ordered (P2/n ) and disordered ( C2/c ) pyroxenes belonging to the join augite-jadeite were investigated at room temperature in the range 70–1400 cm 21. The spectra change as a fun...
Structural mechanisms of solid solution and cation ordering in augite-jadeite pyroxenes: I. A macroscopic perspective
Structural mechanisms augite-jadeite pyroxenes macroscopic perspective
2012/3/31
Single-crystal and powder X-ray diffraction data were collected to characterize the mac-roscopic solid-solution and cation-ordering behavior in the system augite-jadeite (low ac-mite content). We exam...
Cation Ordering in Synthetic Layered Double Hydroxides
Cation Ordering LDH Pyroaurite XAS XRD
2011/12/22
Abstract: A combined powder X-ray diffraction (XRD) and X-ray absorption (XAS) study of Fe(III) cation ordering within pyroaurite is described. It is concluded that there is no correlation between Fe(...
Cation ordering in lead-molybdenum-vanadium oxychlorides
Cation lead-molybdenum-vanadium oxychlorides
2012/4/9
The crystal chemistry and structure ofthe layered lead oxychloride parkinsonite, ideally Pb7Mo09C12, have been reevaluated in the light of TEM observations of natural and syn-thetic samples and the st...
Two-site multi-cation ordering-disordering in minerals: An alternative kinetic model
Two-site multi-cation ordering-disordering minerals kinetic model
2012/4/6
Mueller'smodelhasbeenwidelyapplied to modelingkineticexperimental data onthe ordering-disordering ofcations betweentwo nonequivalent sites.Thismodelis validonly for pure ornearly purebinary systems. F...
Magnetic properties of the magnetite-spinel solid solution: Curie temperatures, magnetic susceptibilities, and cation ordering
Magnetic properties magnetite-spinel solid solution Curie temperatures magnetic susceptibilities cation ordering
2012/4/5
Curietemperatures (Td ofthe (Fe304)x(MgA1204)1-xsolid solution have been deter-minedfrom measurementsofmagneticsusceptibility (x)vs.temperature. Thetrend in Te
vs.composition extrapolates to 0Katx =0...
Review of Cation Ordering in Micas
Cation ordering Lepidolite Margarite Mica Muscovite Paragonite Phengite
2012/2/2
Long-range ordering of tetrahedral cations in micas is favored by phengitic compositions, by the 3T stacking sequence of layers, and by tetrahedral Si:Al ratios near 1:1. Phengites of the 1M, 2M1, and...
Mossbauer, Thermomagnetic, and X-Ray Study of Cation Ordering and High-Temperature Decomposition in Biotite
Biotite Ferrispinel Mossbauer spectra Oxybiotite Thermal decomposition Thermomagnetism
2012/2/9
To explain the large values of the quadrupole splittings and line widths in the M鰏sbauer spectrum of oxybiotite, a formalized analysis of the distribution of effective charges in the anion network was...
Cation ordering in amesite-2H2 from Antarctica has reduced the true symmetry from the ideal hexagonal space group P63 to triclinic P1. All crystals show 6-fold biaxial twin sectors on (001), and the t...