The Remarkable Behavior of Crystalline [Fe(η5-C5H4CHO)2]:  Two Solid-to-Solid Phase Transitions and a Solid-State Reaction†

1999 ◽  
Vol 18 (20) ◽  
pp. 4191-4196 ◽  
Author(s):  
Dario Braga ◽  
Francesca Paganelli ◽  
Emilio Tagliavini ◽  
Sonia Casolari ◽  
Gianna Cojazzi ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Solid State ◽  
Solid State Reaction ◽  
Solid Phase

Solid Phase Synthesis and Sintering Properties of Yttrium Iron Garnet

2008 ◽  
Vol 368-372 ◽  
pp. 588-590 ◽  
Author(s):  
Ming Hao Fang ◽  
Jun Tong Huang ◽  
Zhao Hui Huang ◽  
Yan Gai Liu ◽  
Bin Jiang ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Single Phase ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Volume Density ◽  
Phase Synthesis ◽  
Fe2o3 Content ◽  
Sintering Properties ◽  
Iron Garnet

Single phase YIG powders were synthesized successfully using Fe2O3 and Y2O3 as starting materials by solid state reaction, and YIG ceramics were prepared by pressureless sintering. The influence of synthesizing temperature and Fe2O3 content on the final production were studied The effect of Fe2O3 content on volume density and microstructure of the sintered YIG was also investigated. The results showed that single phase YIG powders were synthesized by solid state reaction at 1400°C for 3h. When Fe2O3 content was excessive 3 wt%, YIG ceramics with a density of 5.294g·cm-3 was fabricated by sintering at 1480°C for 2.5h.

Fabrication of Lithium Silicate Doped with Lithium Titanate by Solid-State Reaction and its XRD Study

2012 ◽  
Vol 624 ◽  
pp. 200-203
Author(s):  
Yu Tian Wang ◽  
You Dong Cao ◽  
Jin Hu ◽  
Wei Jun Zhang ◽  
Da Ping Wu ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid Phase ◽  
Raw Materials ◽  
Xrd Analysis ◽  
Lithium Titanate ◽  
Lithium Silicate ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Scanning Calorimetry

Fabrication of lithium silicate powder containing lithium titanate by solid phase reaction method. LiFabrication of lithium silicate powder doped with lithium titanate by solid-state reaction. Take lithium carbonate, silicon dioxide and titania as raw materials and then these powders were mixed according to the different ratios and grinded in an agate mortar for 15 min. And then the mixture were dried at 80°C. Finally, the samples were sintered in vacuum tube furnace at 750, 800, 850 and 900°C for 2h. Thermogravimetric analysis, differential scanning calorimetry and XRD analysis were carried out systematically in this paper. The reaction process and mechanism at different temperatures and the effect of the different ratios and sintering temperature were discussed. Experimental results showed that lithium titanate component increased with increasing amount of titanium dioxide. While the mixture were sintered at 900°C for 2h, there would have lithium silicate and lithium titanate phase.

Phonon spectra of ortho -dinitrotetramethylbenzene crystals

1987 ◽  
Vol 65 (9) ◽  
pp. 2122-2125 ◽  
Author(s):  
Paolo Sgarabotto ◽  
Mario Braghetti ◽  
Rosario Sergio Cataliotti ◽  
Giulio Paliani ◽  
Salvatore Sorriso ◽  
...  
Keyword(s):  
Group Theory ◽  
Phase Transitions ◽  
Solid State ◽  
Melting Point ◽  
Nitro Group ◽  
Vibrational Spectra ◽  
Lattice Dynamics ◽  
Solid Phase ◽  
Methyl Group ◽  
Phonon Spectra

We have studied the vibrational spectra and thermal behaviour of ortho-dinitrotetramethylbenzene (o-DNTMB) to learn more about its molecular and lattice dynamics. The molecule undergoes two solid–solid phase transitions, close to the melting point, which could be explained by the relaxation of forces hindering the methyl-group and nitro-group free rotations. We have deduced the nature of the solid state vibrational motions, particularly those of lattice phonons, using group theory.

Thermo-Chemo-Elasticity Considering Solid State Reaction and the Displacement Potential Approach to Quasi-Static Chemo-Mechanical Problems

2018 ◽  
Vol 10 (10) ◽  
pp. 1850112 ◽  
Author(s):  
Xiaolong Zhang ◽  
Zheng Zhong
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid Phase ◽  
Homogeneous Solution ◽  
Diffusion Reaction ◽  
Internal Stresses ◽  
Potential Approach ◽  
Displacement Potential ◽  
Initial Boundary Problem ◽  
Static Conditions

Engineering materials and structures represent complex behaviors when reacting to superposed influences of mechanical forces, high temperature, diffusion and reaction of chemicals, which could cause large internal stresses and further induce cracks or failure. To determine the material reliability and integrity, the multi-field interactions and stresses/strains evolutions need to be identified at first. We proposed a theory of thermo-chemo-elasticity considering solid state reactions between the solid phase and absorbed chemicals in a stressed-solid. Both diffusion–reaction induced chemical strains and thermal dilations are taken into account as functions of species concentration, reaction extent and temperature. The fully coupled conservation laws, constitutive equations and chemical kinetics are formulated for the initial-boundary problem. For isotropic solids, we developed a displacement potential approach for steady-state 3D problems of thermo-chemo-elasticity. Solutions can be found from particular solutions of displacement potential and homogeneous solution of thermo-chemo Lamé equation. This approach is also available for transient chemo-mechanical problems in thermal equilibrium providing that quasi-static conditions are introduced. We exemplified the model with a reaction-dominated problem of a core–shell structure subjected to chemo-mechanical loading and the results demonstrate the capability of the model in dealing with comprehensive influences of solid state reaction and species diffusion on solids.

The thermodynamics of orientational disorder in a molecular solid: (CH3)3CCHO

1988 ◽  
Vol 66 (4) ◽  
pp. 729-733 ◽  
Author(s):  
Mary Anne White ◽  
Allyson Perrott
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Heat Capacity ◽  
Phase Transitions ◽  
Solid State ◽  
Magnetic Resonance ◽  
Thermodynamic Parameters ◽  
Solid Phase ◽  
Orientational Disorder ◽  
Molecular Solid ◽  
Nuclear Magnetic

The heat capacity of tert-butylaldehyde, (CH3)3CCHO, has been measured as a function of temperature from 29 to 298 K, to investigate solid-state polymorphism. There are two solid–solid phase transitions in this material, Ttr = 158.5 and 183.9 K, ΔStr = 0.402 R and 3.153 R respectively. The thermodynamic parameters for the transitions are consistent with mechanisms proposed on the basis of recent nuclear magnetic resonance investigations of this material.

scholarly journals Synthesis, crystal structure, and thermal stability of double borate Na3ErB2O6

2021 ◽  
Vol 8 (4) ◽  
pp. 20218402
Author(s):  
Alexey K. Subanakov ◽  
Evgeniy V. Kovtunets ◽  
Bair G. Bazarov ◽  
Jibzema G. Bazarova
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Phase Transitions ◽  
Solid State ◽  
Solid State Reaction ◽  
Rietveld Method ◽  
Three Dimensional ◽  
Dsc Measurements ◽  
Reversible Phase ◽  
Thermal Stability Of

Double borate Na3ErB2O6 was synthesized by the solid-state reaction. The crystal structure of Na3ErB2O6 was refined by the Rietveld method: P21/c, a = 6.49775(14) Å, b = 8.50424(17) Å, c = 12.0067(3) Å, β = 118.4797(9)°, Z = 4. The crystal structure of Na3ErB2O6 consists of –[ErO6]∞-chains along the "b" axis, which are linked by BO3 triangles in a three-dimensional framework. Sodium atoms occupy empty positions inside the channels. The thermal behavior of Na3ErB2O6 was studied in detail in the range of 25–1150 °C range by DSC and TG methods. Na3ErB2O6 congruently melts at 1116 °C. Based on the results of DSC measurements, three reversible phase transitions were found for Na3ErB2O6.

Solid-State Chemical Reaction Synthesis and Characterization of Nanocrystalline CePO4 under Ultrasonication Spectra

2012 ◽  
Vol 602-604 ◽  
pp. 153-156
Author(s):  
Dao Hua Li
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Size Distribution ◽  
Solid State Reaction ◽  
Solid Phase ◽  
Particle Diameter ◽  
Earth Metal ◽  
Average Particle ◽  
Reaction Conditions ◽  
Inert Substance

Under the conditions of the presence of surfactants and ultrasonication, the use of different cerium salt, respectively, with phosphate under solid state chemistry reactions, the synthesis of nano-rare earth metal complexes of CePO4 crystals was formed. The solid phase was characterized by powder X-ray diffraction and electron diffraction. The particle size, its distribution, and morphology of the prepared nanocrystallite were observed by transmission electron microscopy. The results show that particle sizes are relatively uniform, the morphology of the crystal is spherical, the average particle diameter is about 50 nm, and the yield rate is approximately 92.8%. Furthermore, during the synthesis, the solid-state reaction conditions including raw materials, matching proportion of reactants, additions of inert substance, addition of trace solvents, surfactants and porphyrization time, etc, all have some influence on the morphology, particle size and size distribution of the final products. During the synthesis of the nanocrystalline CePO4, the solid state reaction conditions such as changing reactant, matching proportion of reactant, adding inert substance, joining a little solvent or surface active solvent and grinding at different times may influence morphology, particle size and the size distribution of final products.

Characterization of Zirconium Germanosilicide Formed by Solid State Reaction of ZR With Sil−xGex Alloys

1995 ◽  
Vol 402 ◽  
Author(s):  
Z. Wang ◽  
D. B. Aldrich ◽  
P. Goeller ◽  
R. J. Nemanich ◽  
D. E. Sayers
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Sheet Resistance ◽  
Solid State Reaction ◽  
Solid Phase ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Final Phase ◽  
The Stability

AbstractWe have investigated the electrical and structural properties of zirconium germanosilicide (Zr-Si-Ge) films formed during the Zr-Sil−xGex solid state reaction. Thin films of C49 Zr(Si1−xGex)2 were formed from the solid phase reaction of Zr and Si1−xGex bilayer structures. It was observed that Zr reacts uniformly with the Sil−xGex alloy and that C49 Zr(Si1−x Gex)2 is the final phase of the Zr-Si1−xGex, solid phase reaction (such tht y = x) for all compositions examined (x = 0.20, 0.33, and 0.50). The sheet resistance of the Zr(Si1−xGex)2 thin films were higher than the sheet resistance measured for ZrSi2 films. The stability of Zr(Sil−x Gex)2 in contact with Si1−Gex was investigated and no germanium segregation was detected in the Zr(Si1−xGex)2/Si1−Gex structures.

I. Order–disorder transitions and solid state reaction kinetics in Na2SO4–K2SO4 system

1983 ◽  
Vol 61 (3) ◽  
pp. 594-598 ◽  
Author(s):  
M. Sunitha Kumari ◽  
Etalo A. Secco
Keyword(s):  
Phase Transitions ◽  
Solid State ◽  
Reaction Kinetics ◽  
Infrared Absorption ◽  
Solid State Reaction ◽  
Thermal Analyses ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solid State Reaction Kinetics

The physicochemical aspects of the order–disorder phase transitions occurring in the Na2SO4–K2SO4 system were investigated by thermal analyses, infrared absorption, and X-ray diffraction methods.Kinetic and structural studies on the compounds KNaSO4 and K3Na(SO4)2 are reported in more detail.

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