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2021
Framboid microcrystals grow through surface reaction of S2(-II) or H2S with =FeS moieties at defect sites on the pyrite crystal surface. The surface energies of pyrite vary from the most stable cubic through octahedral to pyritohedral and dodecahedral surfaces.
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Framboid microcrystals grow through surface reaction of S2(-II) or H2S with =FeS moieties at defect sites on the pyrite crystal surface. The surface energies of pyrite vary from the most stable cubic through octahedral to pyritohedral and dodecahedral surfaces.
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The Microcrystal Melting Transition
Molecular Simulation, 1988Abstract Metropolis Monte Carlo simulations of the melting transition of Lennard-Jones microcrystals confined to spherical cavities are reported. While 13 atom microcrystals melt continuously, larger microcrystals containing 201 and 209 atoms exhibit a first-order-like freezing transition to an HCP structure.
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The investigation of magnetite microcrystals
Hyperfine Interactions, 1992Four samples of Fe3O4 microcrystals with average particle size of 72, 88, 100, 100A have been investigated by Mossbauer spectroscopy, accompanied with x-ray diffraction and transmission electron microscopy. The experimental results show that the anisotropy energy constantK increases as the particle size decreases.
Zheng Hu +5 more
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Voltammetry of azobenzene microcrystals
Journal of Solid State Electrochemistry, 1997Azobenzene solid particles have been mechanically attached to a graphite electrode and measured by cyclic staircase voltammetry. Well-developed and widely separated chatodic and anodic peak were observed. Redox reaction is controlled by both the heterogeneous charge transfer kinetics and the mass transfer.
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Structure of polypyromellitimide microcrystals
Polymer Science U.S.S.R., 1975Abstract Polypyromellitimide single crystals were grown and examined by electron microscope. A geometrical model was made and molecules packed in an elementary cell and fold. Electron diffraction patterns were obtained which contained seven rings of molecular scattering, as well as crystalline reflexes.
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Wannier exciton in microcrystals
Solid State Communications, 1986Abstract A simple variational calculation is presented of the ground state properties of the electron-hole system confined in three-dimensional quantum wells with spherical shape. As the radius of the wall is reduced to a few times the effective Bohr radius of the bulk exciton, the character of the ground state changes abruptly but continuously from ...
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Strain in microcrystals and in superlattices
Optical Engineering, 1990A new general theory of the dependence of strain on crystal size L for defect-free cubic materials bounded by {100} faces is presented. While current theories predict a ('y/L) dependence, this work suggests a (F/L)½ dependence by considering both surface tension (rny) and surface free energy (6FL2) effects.
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Microcrystals in Microcrystal-Associated Arthropathy (UP10:395-400, 1986)
Ultrastructural Pathology, 1990Leopold J. Duyvené de Wit +3 more
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Morphology of ZnO microcrystals
Journal of Crystal Growth, 1977Abstract The morphology of small ZnO crystals, formed by anodic electrocrystallization of a zinc substrate, has been examined via scanning electron microscopy. The general morphology is observed to consist of a network array of discrete single crystal plates.
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