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The heating process (30-200 QC) of a palygorskite-indigo mixture has been monitored in situ and simultaneously by synchrotron powder diffraction and Raman spectroscopy. During this process, the dye an...
In spite of the abundance of colors found in the murals and other objects that correspond to the Classic Mayan period (600-900 A.D.), a peculiar hue captured the interest of researchers. The most well...
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...
Thispaperpresentshigh-resolutionsynchrotronX-raypowderdiffractiondataat290K ontwoFe-bearing,polycrystallinesilicateperovskitesampleswithapproximatecompo- Fe )SiO synthesizedat25GPaand1920Kinamulti-a...
Thecontinuousstructuraltransformationoftetragonalanalcime(Na Al Si 15.87 15.20 32.64 O !/16.3 O)upondehydrationwasstudied,usingRietveldstructureanalysisoftemper-96 2 ature-resolvedpowderdiffraction...
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...
Thecontinuousstructuraltransformationofthenaturalzeolitestilbite(NaK Ba Ca Sr Mg [Fe Al Si O ]!/60 O)upondehydrationhasbeen 3.62 0.44 0.03 6.32 0.28 0.04 17.33 54.64 144 2studiedusingRietveldstructur...
Partialtransformationofmackinawitetogreigitewasalsoobservedusingtransmissionelectronmicroscopy(TEM)followinginsituheating.Electrondiffractionpatternsshowthat(001)ofmackinawiteisparallelto(001)ofgreigi...
cell parameter at each pressure (5.7-42.3 GPa) was calculated from the positions of four reflections (321, 400, 420, and 521) fit by pure Gaussian profiles. With the assumption that the pres- sure ...
High-resolution neutron powder diffraction was used to study phase transitions in theleucite phases of KAlSi206, RbAlSi20", CsAlSi206, and KFeSi206. Thetemperature-depen-dent structural behavior invol...
The crystal structure of synthetic, deuterated katoite [Ca3A12(0.D.)3] has been refined at 0.0001,0.78,3.6,6.1,7.9, and 9.0 GPa using the opposed-anvil Paris-Edinburgh cell and the POLARIS powder diff...
The cell parameters of deuterated gypsum have been extracted from Rietveld anal-ysis of powder neutron diffraction data within the temperature range 4.2-320 K.The thermal expansion of gypsum is highly...
The present study attempts to clarify the structural role of Mnin two pumpellyite specimens with the chemical formulas Ca7.so(Als.91Mn1.85Mg1.16Feo.37)Sill.s40s6-xOHx and Cas.12(AI7.99Mn3.41Mgo.71Feo....
Synchrotron radiation, high-resolution transmission electron microscopy (HRTEM),X-ray powder diffraction, and Raman spectroscopy wereused to study the structure and thermal behavior of malayaite, CaSn...
A new model for the description of the structural disorder in natural kaolinite materials is proposed, based on the stacking of two 1:1 layers and their enantiomorphs, and encompassing previously prop...

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