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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...
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...
Thetemperaturedependenceofthecationdistributioninsyntheticspinel(MgAl O )was2 4 determinedusingin-situtime-of-?ightneutronpowderdiffraction.Neutrondiffractionpat- ternsofstoichiometricMgAl O andsli...
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...
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...
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(...
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...
Mueller'smodelhasbeenwidelyapplied to modelingkineticexperimental data onthe ordering-disordering ofcations betweentwo nonequivalent sites.Thismodelis validonly for pure ornearly purebinary systems. F...
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...
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...
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...

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