A new investigation of correspondence between structure and crystal morphology of barite

1981 ◽  
Vol 104 (2) ◽  
pp. 215-217
Author(s):  
Harald Schwarz ◽  
Heinz Follner
Keyword(s):  
Crystal Morphology

“Preparation of Single Crystalline Gold Films for ED Studies”

1972 ◽  
Vol 30 ◽  
pp. 634-635
Author(s):  
Joseph D. C. Peng
Keyword(s):  
Crystal Morphology ◽  
Diffraction Theory ◽  
Scattering Matrix ◽  
Vacuum Evaporation ◽  
Gold Films ◽  
Matrix Formulation ◽  
Silver Films ◽  
Single Crystalline ◽  
Grating Pattern ◽  
Stacking Disorder

The relative intensities of the ED spots in a cross-grating pattern can be calculated using N-beam electron diffraction theory. The scattering matrix formulation of N-beam ED theory has been previously applied to imperfect microcrystals of gold containing stacking disorder (coherent twinning) in the (111) crystal plane. In the present experiment an effort has been made to grow single-crystalline, defect-free (111) gold films of a uniform and accurately know thickness using vacuum evaporation techniques. These represent stringent conditions to be met experimentally; however, if a meaningful comparison is to be made between theory and experiment, these factors must be carefully controlled. It is well-known that crystal morphology, perfection, and orientation each have pronounced effects on relative intensities in single crystals.The double evaporation method first suggested by Pashley was employed with some modifications. Oriented silver films of a thickness of about 1500Å were first grown by vacuum evaporation on freshly cleaved mica, with the substrate temperature at 285° C during evaporation with the deposition rate at 500-800Å/sec.

THE INFLUENCE OF THE SUPERCOOLING ON THE MECHANICAL PROPERTIES AND CRYSTAL MORPHOLOGY OF WAXY OILS

2016 ◽  
Author(s):  
Diogo Andrade ◽  
Talita Janaina Heller ◽  
Moisés Marcelino Neto ◽  
Cezar Otaviano Ribeiro Negrao
Keyword(s):  
Mechanical Properties ◽  
Crystal Morphology

Other topics

2018 ◽  
Author(s):  
Ted Janssen ◽  
Gervais Chapuis ◽  
Marc de Boissieu
Keyword(s):  
Photonic Crystals ◽  
Crystal Morphology ◽  
Three Dimensional ◽  
Icosahedral Quasicrystal ◽  
Crystal Surfaces ◽  
Decagonal Quasicrystal ◽  
System A ◽  
Fundamental Law ◽  
Quasiperiodic Systems ◽  
Aperiodic Crystals

The law of rational indices to describe crystal faces was one of the most fundamental law of crystallography and is strongly linked to the three-dimensional periodicity of solids. This chapter describes how this fundamental law has to be revised and generalized in order to include the structures of aperiodic crystals. The generalization consists in using for each face a number of integers, with the number corresponding to the rank of the structure, that is, the number of integer indices necessary to characterize each of the diffracted intensities generated by the aperiodic system. A series of examples including incommensurate multiferroics, icosahedral crystals, and decagonal quaiscrystals illustrates this topic. Aperiodicity is also encountered in surfaces where the same generalization can be applied. The chapter discusses aperiodic crystal morphology, including icosahedral quasicrystal morphology, decagonal quasicrystal morphology, and aperiodic crystal surfaces; magnetic quasiperiodic systems; aperiodic photonic crystals; mesoscopic quasicrystals, and the mineral calaverite.

Effect of modification of binary solvent molecules on ε-CL-20 crystal morphology: a molecular dynamics study

CrystEngComm ◽  
2021 ◽  
Author(s):  
Yanpeng Zhao ◽  
Guanwen Su ◽  
Guozhao Liu ◽  
Hongyuan Wei ◽  
Leping Dang
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Crystal Morphology ◽  
Dynamics Simulation ◽  
Binary Solvent ◽  
Binary Solvent Systems ◽  
Solvent Systems ◽  
Solvent Molecules

The effects of thirteen binary solvent systems on the growth of CL-20 were studied by molecular dynamics simulation, and the effect of antisolvent properties on the solvent inhibition was systematically investigated.

A note on crystal morphology of melilite

1975 ◽  
Vol 51 (2) ◽  
pp. 135-138 ◽  
Author(s):  
Th. G. Sahama
Keyword(s):  
Crystal Morphology

Optimizing Hydrogen Storage in MOFs through Engineering of Crystal Morphology and Control of Crystal Size

2021 ◽  
Author(s):  
Kuthuru Suresh ◽  
Darpandeep Aulakh ◽  
Justin Purewal ◽  
Donald J. Siegel ◽  
Mike Veenstra ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Crystal Size ◽  
Crystal Morphology ◽  
And Control

scholarly journals Synthesis of magnesium carbonate hydrate from natural talc

2020 ◽  
Vol 18 (1) ◽  
pp. 951-961
Author(s):  
Qiuju Chen ◽  
Tao Hui ◽  
Hongjuan Sun ◽  
Tongjiang Peng ◽  
Wenjin Ding
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Crystal Growth ◽  
Crystal Morphology ◽  
Magnesium Carbonate ◽  
Organic Additives ◽  
X Ray Diffraction ◽  
Morphological Transformation ◽  
X Ray ◽  
Carbonation Process

AbstractVarious morphologies of magnesium carbonate hydrate had been synthesized without using any organic additives by carefully adjusting the reaction temperature and time during the talc carbonation process. At lower temperatures, magnesium carbonate hydrate was prone to display needle-like morphology. With the further increase of the carbonation temperature, the sheet-like crystallites became the preferred morphology, and at higher aging temperatures, these crystallites tended to assemble into layer-like structures with diverse morphologies, such as rose-like particles and nest-like structure. The reaction time had no effect on the crystal morphology, but it affected the particle size and situation of the crystal growth. X-Ray diffraction results showed that these various morphologies were closely related to their crystal structure and compositions. The needle-like magnesium carbonate hydrate had a formula of MgCO3·3H2O, whereas with the morphological transformation from needle-like to sheet-like, rose-like, and nest-like structure, their corresponding compositions also changed from MgCO3·3H2O to 4MgCO3·Mg(OH)2·8H2O, 4MgCO3·Mg(OH)2·5H2O, and 4MgCO3·Mg(OH)2·4H2O.

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