Search results for "Automated electron diffraction tomography"

showing 3 items of 3 documents

MZ-35, a new layered pentasil borosilicate synthesized in the presence of large alkali cations

2013

Abstract A new layered borosilicate has been synthesized in the presence of cesium and sodium cations and its structure has been solved by a combination of automated diffraction tomography (ADT) and X-ray powder diffraction (XRPD). MZ-35 has a composition NaCs 2 [BSi 7 O 16 (OH) 2 ](OH) 2 ·4H 2 O and features space group P-4m2. The unusually small unit cell ( a 7.3081 A, c 10.7520 A) is shared by two random-stacked configurations of the structure: a network of connected pentasil units related to the layer of RUB-18 and a bidimensional checkerboard of intersecting ladders of 4-membered rings. The two configurations are related by the simple face-sharing inversion of a hydroxyl-bearing tetrah…

Automated electron diffraction tomography; Rietveld structure refinement; Layered borosilicate; 4-MR ladders; Face-sharing terahedraMaterials science4-MR laddersSodiumchemistry.chemical_element02 engineering and technology010402 general chemistry01 natural sciencesDiffraction tomographyFace-sharing terahedraGroup (periodic table)General Materials ScienceRietveld structure refinementLayered borosilicateBorosilicate glassAutomated electron diffraction tomographyGeneral Chemistry4-MR ladders; Automated electron diffraction tomography; Face-sharing terahedra; Layered borosilicate; Rietveld structure refinement[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsAlkali metal4-MR ladders; Automated electron diffraction tomography; Face-sharing terahedra; Layered borosilicate; Rietveld structure refinement;0104 chemical sciencesCrystallographychemistryMechanics of MaterialsCaesiumTetrahedron0210 nano-technologyPowder diffraction
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The structure of charoite, (K,Sr,Ba,Mn)(15-16)(Ca,Na)(32)[(Si-70(O,OH)(180))](OH,F)(4.0)center dot nH(2)O, solved by conventional and automated elect…

2010

AbstractCharoite, ideally (K,Sr,Ba,Mn)15–16(Ca,Na)32[(Si70(O,OH)180)](OH,F)4.0·nH2O, a rare mineral from the Murun massif in Yakutiya, Russia, was studied using high-resolution transmission electron microscopy, selected-area electron diffraction, X-ray spectroscopy, precession electron diffraction and the newly developed technique of automated electron-diffraction tomography. The structure of charoite (a= 31.96(6) Å,b= 19.64(4) Å,c= 7.09(1) Å, β = 90.0(1)°,V= 4450(24) Å3, space groupP21/m) was solvedab initioby direct methods from 2878 unique observed reflections and refined toR1/wR2= 0.17/0.21. The structure can be visualized as being composed of three different dreier silicate chains: a d…

Charoite010504 meteorology & atmospheric sciencesChemistryAb initioPrecession electron diffraction (PED)engineering.material010502 geochemistry & geophysics01 natural sciencesCrystal structure analysisCrystalAutomated electron diffraction tomography (ADT)CrystallographyElectron diffractionOctahedronGeochemistry and PetrologyCharoiteengineeringAutomated electron diffraction tomography (ADT); Charoite; Crystal structure analysis; Precession electron diffraction (PED)Precession electron diffractionMoleculeSpectroscopy0105 earth and related environmental sciences
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Structure analysis of titanate nanorods by automated electron diffraction tomography

2011

A hitherto unknown phase of sodium titanate, NaTi3O6(OH)·2H2O, was identified as the intermediate species in the synthesis of TiO2 nanorods. This new phase, prepared as nanorods, was investigated by electron diffraction, X-ray powder diffraction, thermogravimetric analysis and high-resolution transmission electron microscopy. The structure was determined ab initio using electron diffraction data collected by the recently developed automated diffraction tomography technique. NaTi3O6(OH)·2H2O crystallizes in the monoclinic space group C2/m. Corrugated layers of corner- and edge-sharing distorted TiO6 octahedra are intercalated with Na+ and water of crystallization. The nanorods are typically …

Diffractionthermogravimetric analysisReflection high-energy electron diffractionChemistryGeneral Medicinetitanate nanorodsGeneral Biochemistry Genetics and Molecular BiologyCrystallographyElectron diffractionX-ray powder diffractionEnergy filtered transmission electron microscopyautomated electron diffraction tomographyhigh-resolution transmission electron microscopySelected area diffractionHigh-resolution transmission electron microscopyPowder diffractionElectron backscatter diffractionautomated electron diffraction tomography; high-resolution transmission electron microscopy; thermogravimetric analysis; titanate nanorods; X-ray powder diffraction
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