Crystal growth, morphology, structure, and properties of HNaMP2O7 crystals where M = Co and Ni

1994 ◽  
Vol 9 (6) ◽  
pp. 1519-1525 ◽  
Author(s):  
K. Byrappa ◽  
Umesh B.V. Dutt ◽  
A. Clearfield ◽  
Damodara M. Poojary
Keyword(s):  
Crystal Structure ◽  
Crystal Growth ◽  
Hydrothermal Method ◽  
Growth Process ◽  
Crystal Morphology ◽  
Structure And Properties ◽  
Growth Morphology ◽  
Solute Interaction

The HNaMP2O7 (where M = Co and Ni) new Na+ superionic pyrophosphates were obtained by the hydrothermal method at lower PT conditions (T = 250 °C, P = 100 atm). The solubility, complexation with reference to the solvent-solute interaction, and the growth process have been studied in detail. A new investigation on the crystal structure of these compounds showed that the title compounds do not contain Zr as reported previously. The crystal morphology and properties have also been studied.

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.

Crystal morphology prediction of energetic materials grown from solution: insights into the accurate calculation of attachment energies

CrystEngComm ◽  
2019 ◽  
Vol 21 (33) ◽  
pp. 4910-4917 ◽  
Author(s):  
Yingzhe Liu ◽  
Shiyao Niu ◽  
Weipeng Lai ◽  
Tao Yu ◽  
Yiding Ma ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Energetic Materials ◽  
Crystal Morphology ◽  
Energy Model ◽  
Growth Morphology ◽  
Accurate Calculation ◽  
Attachment Energy

Reasonable modifications to the attachment energy model were made for accurately predicting the crystal growth morphology of energetic materials in solution.

Effect of Calcium Carbonate on Crystallization Behavior and Morphology of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate)

2017 ◽  
Vol 751 ◽  
pp. 242-251 ◽  
Author(s):  
Sitthi Duangphet ◽  
Damian Szegda ◽  
Karnik Tarverdi ◽  
Jim Song
Keyword(s):  
Crystal Structure ◽  
Growth Rate ◽  
Crystal Growth ◽  
Calcium Carbonate ◽  
Growth Process ◽  
Crystal Growth Rate ◽  
Molecular Weight Determination ◽  
High Concentration ◽  
Sem Images ◽  
Significant Difference

The effects of calcium carbonate (CaCO3) concentration on crystallization behaviors and morphology of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) were investigated. Composites of PHBV with CaCO3 were prepared with filler loadings of low (5%wt) and high concentration (20%wt) and these were subsequently compared to unloaded PHBV. The morphologies of PHBV composites on the freeze-fractured specimens were examined using scanning electron microscopy (SEM). The SEM images revealed that increasing concentration of CaCO3 resulted in agglomeration. This agglomeration might affect crystal growth rate and mechanism. The crystal growth behavior of melt-crystallized PHBV with different amounts of CaCO3 was studied by polarized optical microscopy (POM), while the crystal structure was examined by X-ray diffraction (XRD). The rate of crystal growth determined from POM at selected crystallization temperatures revealed that the addition of a small amount of CaCO3 accelerated crystal growth rate, whereas excess amount of CaCO3 had the opposite effect. The POM images were also used to illustrate the change of crystal growth process presence of CaCO3. The unloaded PHBV clearly showed nucleation and growth mechanism, while PHBV composites displayed nucleation and then combination of crystals during the growth process. However, CaCO3 did not affect the crystal structureof any PHBV composite as observed by XRD. Molecular weight determination via gel permeation chromatography (GPC) indicated that there was no significant difference among PHBV composites.

Study on Kinetic Competitions of Crystal Growth

2013 ◽  
Vol 690-693 ◽  
pp. 1788-1791
Author(s):  
Tao He
Keyword(s):  
Crystal Growth ◽  
Crystal Morphology ◽  
Film Growth ◽  
Axiomatic Approach ◽  
Growth Mechanisms ◽  
Growth Morphology ◽  
Growth Processes ◽  
Full Generality ◽  
Stages Of Growth ◽  
Key Issues

One of the key issues is in crystal growth technologies is control of crystal morphology. This paper attends to understand film growth in its full generality is to propose a growth law, and it is capable of describing all types of growth mechanisms and determining the growth morphology at different stages of growth. We refer to an axiomatic approach to identify the important scaling in growth processes. One way to determine which processes dominate the competition is to form dimensionless parameters which embody the competitions between pairs of kinetic processes.

Growth of boron suboxide crystals in the B–B2O3 system at high pressure and high temperature

2002 ◽  
Vol 17 (2) ◽  
pp. 284-290 ◽  
Author(s):  
Duanwei He ◽  
Minoru Akaishi ◽  
Brian L. Scott ◽  
Yusheng Zhao
Keyword(s):  
High Pressure ◽  
Crystal Growth ◽  
High Temperature ◽  
Growth Process ◽  
Crystal Morphology ◽  
Experimental Results ◽  
Factors Affecting ◽  
Boron Suboxide ◽  
Different Temperatures

B6O crystal growth from the B–B2O3 system was investigated at 1700–2200 °C and 4.5–6.5 GPa by using two different sample assemblies. Single B6O crystals over 100 μm in size have been synthesized at 5.5 GPa and 2100 °C. This makes it possible to study the properties of this interesting material. The factors affecting the B6O crystal morphology, size, color, and growth process were discussed. The solubility of B6O in B2O3 flux was estimated at 5.5 GPa and different temperatures. On the basis of the experimental results, we suggest two methods to grow large B6O crystals.

Addendum

1995 ◽  
Vol 10 (1) ◽  
pp. 225-225
Author(s):  
K. Byrappa ◽  
B.V. Umesh Dutt ◽  
A. Clearfield ◽  
M. Damodara Poojary
Keyword(s):  
Crystal Growth ◽  
Structure And Properties ◽  
Growth Morphology

Addendum: “Crystal growth, morphology, structure, and properties of HNaMP2O7 crystals where M = Co and Ni” [J. Mater. Res. 9, 1519 (1994)]

CRYSTAL STRUCTURE AND PROPERTIES OF NEW CADMIUMAND THALLIUM-CONTAINING PEROVSKITES

1972 ◽  
Vol 33 (C2) ◽  
pp. C2-241-C2-242
Author(s):  
Yu. N. VENEVTSEV ◽  
A. G. KAPYSHEV ◽  
V. M. LEBEDEV ◽  
V. D. SAL'NIKOV ◽  
G. S. ZHDANOV
Keyword(s):  
Crystal Structure ◽  
Structure And Properties

Single Crystal Growth of High-Pressure Phases of Ice and Salt Hydrate Far Below the Original Melting Point by Mixing Alcohol: Crystal Structure Determination of Magnesium Chloride Heptahydrate

2020 ◽  
Author(s):  
Keishiro Yamashita ◽  
Kazuki Komatsu ◽  
Hiroyuki Kagi
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Crystal Growth ◽  
Single Crystal ◽  
Room Temperature ◽  
Growth Technique ◽  
Salt Hydrate ◽  
X Ray

An crystal-growth technique for single crystal x-ray structure analysis of high-pressure forms of hydrogen-bonded crystals is proposed. We used alcohol mixture (methanol: ethanol = 4:1 in volumetric ratio), which is a widely used pressure transmitting medium, inhibiting the nucleation and growth of unwanted crystals. In this paper, two kinds of single crystals which have not been obtained using a conventional experimental technique were obtained using this technique: ice VI at 1.99 GPa and MgCl<sub>2</sub>·7H<sub>2</sub>O at 2.50 GPa at room temperature. Here we first report the crystal structure of MgCl2·7H2O. This technique simultaneously meets the requirement of hydrostaticity for high-pressure experiments and has feasibility for further in-situ measurements.

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