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Crystal structure refinement of a sepiolite/indigo Maya Blue pigment using molecular modelling and synchrotron diffraction
sepiolite indigo Maya Blue pigment molecular mechanics Rietveld method
2011/11/7
Maya Blue is an artificial pigment used in Pre-Columbian America, renowned for its chemical stability. The pigment can be considered a precursor of modern inclusion compounds as a hosting microporous ...
Crystal structure refinement of palygorskite from neutron powder diffraction
palygorskite structure neutron powder refinement zeolitic water clay mineral
2011/11/4
Palygorskite is a Mg-rich fibrous clay, present in nature as a mixture of two intricately intertwined polymorphs –monoclinic (C2/m) and orthorhombic (Pbmn) –characterized by the presence of channels a...
Refinement of the Crystal Structure of Cronstedtite-1T
Cronstedtite Layer Silicate Order-Disorder (OD) Polytypism X-ray Diffraction
2011/12/6
Abstract: The crystal structure of cronstedtite-1T was refined in space group P31m, using two crystals: a triangular tabular crystal from Herja, Romania and a conical crystal from Lostwithiel, Cornwal...
Rietveld refinement of the crystallographic structure of human dental enamel apatites
Rietveld refinement crystallographic structure human dental enamel apatites
2012/4/1
Rietveld refinements using 12 sets of X-ray diffraction powder data from milligram samples of
human dental enamel provide detailed information about the structure and composition of enamel
apatite. ...
Refinement of the Kaolinite Structure from Single-Crystal Synchrotron Data
Crystal Structure Diffuse Scattering H-Positions Kaolinite Microcrystal Single Crystal Refinement Synchrotron Radiation
2011/12/7
Abstract: The crystal structure of single crystals of kaolinite from Keokuk, Iowa, was refined using data measured at the microfocus X-ray beamline at the ESRE Grenoble, France (λ = 0.6883, T = room t...
Single-crystal structure refinement of synthetic M4K-substituted potassic richterite K(KCa)Mg5Si8O22(OH)2
Single-crystal structure refinement M4 potassic richterite
2012/3/31
The crystal structure of a potassic richterite, K(KCa)Mg Si O (OH) synthesized at 15 GPa and
1400 ?C, was refined from single-crystal X-ray diffraction data. The unit-cell parameters are: a =
10.192...
High-resolution synchrotron X-ray powder diffraction and Rietveld structure refinement of two (Mg0.95,Fe0.05)SiO3 perovskite samples synthesized under different oxygen fugacity conditions
high-resolution synchrotron X-ray powder diffraction
2012/3/30
Thispaperpresentshigh-resolutionsynchrotronX-raypowderdiffractiondataat290K
ontwoFe-bearing,polycrystallinesilicateperovskitesampleswithapproximatecompo-
Fe )SiO synthesizedat25GPaand1920Kinamulti-a...
Structure refinement of birefringent Cr-bearing majorite Mg3(Mg0.34Si0.34Al0.18Cr0.14)2Si3O12
Mg3(Mg0.34Si0.34Al0.18Cr0.14)2Si3O12 Crions
2012/3/30
A single crystal of a birefringent Cr-bearing majorite, Mg (Mg Si Al Cr ) Si O , was
3 0.34 0.34 0.18 0.14 2 3 12
synthesized at 20 GPa and 2000 oC using °∞6(R)C8°± type uniaxial split-sphere appara...
Structure Refinement of Synthetic Deuterated Kaolinite by Rietveld Analysis Using Time-of-Flight Neutron Powder Diffraction Data
Crystal Structure Kaolinite Neutron Powder Diffraction Rietveld Refinement Synthetic Kaolinite
2011/12/22
Abstract: The crystal structure of synthetic deuterated kaolinite was refined by Rietveld analysis using time-of-flight (TOF) neutron powder diffraction data. For non-hydrogen atoms, C1 symmetry was a...
Crystal structure refinement of aluminian lizardite-2H2
Crysta structure refinement aluminian lizardite-2H2
2012/4/6
Well-crystallizedeuhedralcrystalsofaluminianlizardite-2H (MgFeFeAl)2 2.350.060.070.52werefoundnearSchio(Vicenza,Italy).Togaininsightintotherole(SiAl)O(OH)
1.410.595.004.00ofahighAlcontentlizardite,ch...
Theraretwo-layer!fir!fl!flstructureoaa cookeitefromLittleRock,Arkansas,wasre?nedinspacegroup Cc to R 7.1%.MeanT-Obondlengthsof1.654(1)A and1.657(1)A
inonetetrahedralsheetvs.1.659(1)A and1.685(1)A int...
Crystal Structure Refinement and Mossbauer Spectroscopy of an Ordered, Triclinic Clinochlore
Cation Ordering Chlorite Clinochlore Crystal Structure Mossbauer
2011/12/22
Abstract: The crystal structure of a natural, ordered IIb-4 triclinic clinochlore has been refined in space group C1¯ from 4282 unique X-ray intensity measurements of which 3833 are greater than ...
Refinement of an Amesite-2H1 Polytype from Postmasburg, South Africa
Amesite-2H1 Distortions Ordering Patterns Postmasburg Refinement South Africa Twinning
2011/12/9
Abstract: The crystal structure of amesite-2H1 from the Postmasburg Mn ores of South Africa has been refined to R = 4.7% using Siemens P4 rotating-anode MoKα X-ray data and SHELXL-93 software. Partial...
Thestructureofthehigh-pressurecubicdoubleperovskiteCa TiSiO wasre?nedusingsynchrotronX-raypowderdata[S.G. Fm3m,a 7.4105(1)A, Z 4].TiandSiarefullyorderedintoalternatingoctahedraintheperovskiteframework...
Site occupancies in synthetic monoclinic amphiboles: Rietveld structure refinement and infrared spectroscopy of (nickel, magnesium, cobalt)-richterite
Site occupancies synthetic monoclinic amphiboles Rietveld structure refinement infrared spectroscopy nickel magnesium cobalt richterite
2012/4/5
Amphibolesweresynthesizedat750C,1kbar(H O)onthebinaryjoins(nickel,
magnesium)-richteriteand(magnesium,cobalt)-richterite.Structuralvariationsandsiteoc-
cupancieswerecharacterizedbyRietveldstructurer...