Phase transformation studies on anthranilic acid by thermal analysis, infrared absorption, and X-ray diffraction methods

1976 ◽  
Vol 54 (15) ◽  
pp. 2509-2513 ◽  
Author(s):  
Krishnan Rajeshwar ◽  
Etalo A. Secco
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Phase Transformation ◽  
Infrared Absorption ◽  
Anthranilic Acid ◽  
X Ray Diffraction ◽  
X Ray

The kinetic, structural, and thermodynamic aspects of the phase transition, orthorhombic I → orthorhombic II, in anthranilic acid (o-C6H4NH2COOH) were investigated by thermal analysis, infrared absorption, and X-ray diffraction methods.

scholarly journals Thermal Annealing and Phase Transformation of Serpentine-Like Garnierite

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 188
Author(s):  
Arun Kumar ◽  
Michele Cassetta ◽  
Marco Giarola ◽  
Marco Zanatta ◽  
Monique Le Guen ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Raman Spectroscopy ◽  
Phase Transformation ◽  
Differential Thermal Analysis ◽  
Thermal Treatment ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Thermally Induced ◽  
X Ray ◽  
Micro Raman Spectroscopy

This study is focused on the vibrational and microstructural aspects of the thermally induced transformation of serpentine-like garnierite into quartz, forsterite, and enstatite occurring at about 620 °C. Powder specimens of garnierite were annealed in static air between room temperature and 1000 °C. The kinetic of the transformation was investigated by means of thermogravimetric and differential thermal analysis, and the final product was extensively characterized via micro-Raman spectroscopy and X-ray diffraction. Our study shows that serpentine-like garnierite consists of a mixture of different mineral species. Furthermore, these garnierites and their composition can provide details based on the mineralogy and the crystalline phases resulting from the thermal treatment.

Synthesis, crystal structures and phase transformation of the new solid-state forms of tetrandrine

RSC Advances ◽  
2014 ◽  
Vol 4 (107) ◽  
pp. 62586-62593 ◽  
Author(s):  
Zhengzheng Zhou ◽  
Henry H. Y. Tong ◽  
Liang Li ◽  
Fanny L. Y. Shek ◽  
Yang Lv ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Phase Transformation ◽  
Solid State ◽  
Crystal Structures ◽  
X Ray Diffraction ◽  
X Ray

In this study, the solid-state forms and phase transformation of tetrandrine (Tet) were investigated and characterized using X-ray diffraction and thermal analysis.

scholarly journals Synthesis, characterization, and thermal behavior of amidosulfonates of transition metals in air and nitrogen atmosphere

2020 ◽  
Vol 45 (4) ◽  
pp. 32-39
Author(s):  
Jose Marques Luiz ◽  
Ronaldo Spezia Nunes
Keyword(s):  
Thermal Analysis ◽  
Infrared Absorption ◽  
Elemental Analysis ◽  
Nitrogen Atmosphere ◽  
Direct Reaction ◽  
Infrared Absorption Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Carbonate ◽  
Dta Curves

The amidosulfonates of Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ were prepared by the direct reaction between the metal carbonate and the amidosulfonic acid with heating and stirring. The compounds were characterized by infrared absorption spectroscopy (IRFT), elemental analysis, thermal analysis (TG and DTA) and X-ray diffraction by the powder method. The absorptions observed in IR spectra are associated with N-H and O-H stretching, as well as symmetrical and asymmetric S-O stretching in the sulfonic group. The compounds present X-ray diffraction pattern with well-defined reflections, showing no evidence of isomorphism. The TG-DTA curves allowed to establish the stoichiometry of compounds as M(NH2SO3)2.xH2O, where M = Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ and x ranging from 1 to 4. Dehydration leads to the formation of stable anhydrous. In all cases the respective sulfates are formed as an intermediate. After consecutive steps of decomposition, the respective oxides were obtained: Mn3O4, CoO, NiO, CuO and ZnO. The TG-DTA curves are characteristic for each sample, with thermal events related to dehydration and ligand decomposition.

Study on the Structure and Phase Transition of Sm Substituted BiFeO3 Nanoparticles

2011 ◽  
Vol 418-420 ◽  
pp. 278-281
Author(s):  
Yu Xia Sun ◽  
Xing Wen Zhang ◽  
Hong Ri Liu
Keyword(s):  
Phase Transition ◽  
Phase Transformation ◽  
Annealing Temperature ◽  
Raw Materials ◽  
Structural Phase ◽  
Phase Transformation Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bifeo3 Nanoparticles ◽  
Substitution Ratio

Pure and Sm substituted BiFeO3 nanoparticles were prepared by a coprecipitate method using Bi(NO3)3•5H2O and Fe(NO3)•9H2O as raw materials. X-ray diffraction pattern indicates that perovskite structural BiFeO3 can be obtained using 0.02 molar precursor precipitate by annealing at 550 °C. A structural phase transition deduced by Sm substitution was observed. SEM results showed that the size of BiFeO3 increases with annealing temperature and substitution ratio. DTA results showed that the phase transformation temperature decreases with Sm substitution ratio.

Synthesis and Thermal Analyses of TiO2-Derived Nanotubes Prepared by the Hydrothermal Method

2004 ◽  
Vol 19 (4) ◽  
pp. 982-985 ◽  
Author(s):  
Yoshikazu Suzuki ◽  
Susumu Yoshikawa
Keyword(s):  
Thermal Analysis ◽  
Aqueous Solution ◽  
Phase Transformation ◽  
Reaction Path ◽  
Thermal Analyses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Study ◽  
Layered Titanate ◽  
Dehydration Behavior

TiO2-derived nanotubes were prepared by hydrothermal treatment of TiO2 powder in NaOH aqueous solution. High-temperature x-ray diffraction (HT-XRD) andthermogravimetry-differential thermal analysis (TG-DTA) demonstrated the formation of TiO2 (B) phase (a metastable polymorph of titanium dioxide) from the nanotubes under heating at ∼800 °C, which indicates the as-prepared nanotubes should be composed of layered titanate, most probably as H2Ti3O7·nH2O (n < 3). Dehydration behavior and phase transformation confirmed by the HT-XRD study have suggested reliable reaction path and have well-solved the contradictions on the nanotube-formation mechanism among previous studies.

The fcc to hcp transition induced by mechanical deformations in the Ni–Ru system

1992 ◽  
Vol 7 (9) ◽  
pp. 2412-2417 ◽  
Author(s):  
A. Van Neste ◽  
A. Lamarre ◽  
M.L. Trudeau ◽  
R. Schulz
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Thermal Analysis ◽  
Transition Point ◽  
Structural Transition ◽  
Crystalline Solid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mechanical Deformations ◽  
Transmission Electron

The structural transition between the metastable fcc and hcp crystalline solid solutions in the Ni–Ru system has been studied as a function of composition using the mechanical alloying technique. At the transition point, the spacings between the close-packed planes of the metastable fcc and hcp phases are the same. No amorphization is observed at the interfaces. This mechanically induced phase transition has been studied by x-ray diffraction, transmission electron microscopy, and differential thermal analysis.

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