Journal ArticleDOI
The Crystal Structure of Talc
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TLDR
The crystal structure of a sample of talc from Harford County, Maryland, has been deter-mined by least squares refinement from X-ray diffraction photographs as mentioned in this paper, where the layers of the structure have almost monoclinic symmetry but the nearly hexagonal rings of oxygen atoms on the surfaces of the layers, formed by the bases of the silica tetrahedra, are not held in register by interlayer ions as they are in micas but are partly displaced so that the stack of layers forms a triclinic crystal.Abstract:
The crystal structure of a sample of talc from Harford County, Maryland, has been deter- mined by least squares refinement from X-ray diffraction photographs. A triclinic cell with a = 5.293, b = 9.179, c = 9.496A, a = 90'57 ~ = 98-91 ~ y = 90.03, space group cT is adopted. The layers of the structure have almost monoclinic symmetry but the nearly hexagonal rings of oxygen atoms on the surfaces of the layers, formed by the bases of the silica tetrahedra, are not held in register by inter- layer ions as they are in micas but are partly displaced so that the stack of layers forms a triclinic crystal. The hexagons of surface oxygens are distorted by a 3.4 ~ twist of the tetrahedra so that the b axis is 0.2 per cent shorter than in a structure with regular hexagons, and the twist brings the oxygen ions a little closer to the octahedral magnesium ions.read more
Citations
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Journal ArticleDOI
Crystallization kinetics of poly(lactic acid)-talc composites
TL;DR: In this paper, the effect of talc and PLA crystallinity on mechanical properties was analyzed on poly(lactic acid) / talc composites before and after an annealing process.
Journal ArticleDOI
Effects of substrate structure and composition on the structure, dynamics, and energetics of water at mineral surfaces: A molecular dynamics modeling study
TL;DR: In this paper, molecular dynamics computer simulations of the molecular structure, diffusive dynamics and hydration energetics of water adsorbed on (0,0,1) surfaces of brucite Mg(OH) 2, gibbsite Al( OH) 3, hydrotalcite H 2 O 6 Cl 2H 2 O, muscovite KAl 2 (Si 3 Al)O 10 (OH)2, and talc Mg 3 Si 4 O 10 (OM) 2 provide new insight into the relationships between the substrate structure and composition and the
Journal ArticleDOI
Antigorite: High-pressure stability in the system MgOSiO2H2O (MSH)
Bernd Wunder,Werner Schreyer +1 more
TL;DR: In this paper, the authors showed that antigorite is stable at about 15 kbar/650°C, which is the same as the PT conditions for the reaction of Trommsdorff et al.
References
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Book
International tables for X-ray crystallography
Norman Fordyce McKerron Henry,Lonsdale, Kathleen, Dame,John S. Kasper,Caroline H. MacGillavry,Gerard D. Rieck,James A. Ibers,Walter C. Hamilton +6 more
Journal ArticleDOI
Coherent X‐Ray Scattering for the Hydrogen Atom in the Hydrogen Molecule
TL;DR: In this paper, the x-ray form factors for a bonded hydrogen in the hydrogen molecule have been calculated for a spherical approximation to the bonded atom, and the corresponding complex scattering factors have also been calculated.
Journal ArticleDOI
The infra-red spectra of layer silicates
V.C. Farmer,J.D. Russell +1 more
TL;DR: In this article, the effect of the deviation from hexagonal symmetry shown by the tetrahedral layers of dioctahedral minerals on their vibrations is theoretically analyzed, and shown to account for some of the principal differences between the spectra of diotheoric and trioctahedric layer silicates in the 1300 to 400 cm−1 region.
Journal ArticleDOI
The Structure of the Micas and Related Minerals.
TL;DR: A structure is formulated for talc, pyrophillite, the micas, and the brittle micas which is substantiated by the x-ray examination of the minerals, explains their remarkable physical properties, and leads to a general chemical formula unifying the widely varying analyses reported for different specimens.
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