Crystal formation in vanadium-doped zirconia ceramics

CrystEngComm ◽  
2018 ◽  
Vol 20 (22) ◽  
pp. 3105-3116 ◽  
Author(s):  
Roman Svoboda ◽  
Roman Bulánek ◽  
Dušan Galusek ◽  
Roghayeh Hadidimasouleh ◽  
Yadolah Ganjkhanlou
Keyword(s):  
Differential Scanning Calorimetry ◽  
Diffraction Analysis ◽  
Crystal Formation ◽  
X Ray Diffraction ◽  
Zirconia Ceramics ◽  
Scanning Calorimetry ◽  
X Ray

Differential scanning calorimetry and in situ X-ray diffraction analysis were used to study the products and mechanism of crystal formation in VOx–ZrO2 ceramics.

A Model for Formation and Consumption of Transient Phase

2011 ◽  
Vol 172-174 ◽  
pp. 646-651 ◽  
Author(s):  
Gamra Tellouche ◽  
Khalid Hoummada ◽  
Dominique Mangelinck ◽  
Ivan Blum
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Formation ◽  
Transient Phase ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Proposed Model ◽  
Transient Phases ◽  
Kinetics Of

The phase formation sequence of Ni silicide for different thicknesses is studied by in situ X ray diffraction and differential scanning calorimetry measurements. The formation of a transient phase is observed during the formation of δ-Ni2Si; transient phases grow and disappear during the growth of another phase. A possible mechanism is proposed for the transient phase formation and consumption. It is applied to the growth and consumption of θ-Ni2Si. A good accordance is found between the proposed model and in situ measurement of the kinetics of phase formation obtained by x-ray diffraction and differential scanning calorimetry for higher thickness.

Synthesis of nanocomposite coating of electrodeposed amorphic layers of the Ni–P–W system

2020 ◽  
pp. 53-60
Author(s):  
A. V. Krasikov
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Differential Scanning Calorimetry ◽  
Phase Composition ◽  
Diffraction Analysis ◽  
Nanocomposite Coating ◽  
Nanocrystalline Phase ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

The processes of the formation of the nanocomposite coating of Ni–11.5% P–5%W were studied during the heat treatment of amorphous electrodeposited layers. Using the method of differential scanning calorimetry, the temperature of the onset of crystallization of the nanocrystalline phase Ni3P was determined. X-ray diffraction analysis showed that heat treatment produces Ni3P phosphides and, presumably, Ni5P2, the size of which, according to electron microscopy, is 5–50 nm. The influence of the duration of heat treatment on the phase composition and microhardness of coatings is investigated.

In-Situ Characterisation of Precipitation in AI-Cu thin films

1999 ◽  
Vol 562 ◽  
Author(s):  
J. P. Lokker ◽  
A. J. Bottger ◽  
G. C. A. M. Janssen ◽  
S. Radelaar
Keyword(s):  
Thin Films ◽  
Differential Scanning Calorimetry ◽  
Bulk Material ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Enthalpy Changes ◽  
Thin Foils ◽  
Lower Temperature

ABSTRACTThe precipitate formation occurring in Al-Cu thin foils with copper concentrations of either 1.15 at.% or 0.3 at.%, has been studied. In-situ X-ray diffraction analysis and differential scanning calorimetry are applied to determine the phases formed and the enthalpy changes in the same samples. Both X-ray diffraction and differential scanning calorimetry indicate that the precipitation behaviour of thin films (about 500 nm thickness) differs significantly from that of bulk material. In the films studied the precipitation of Al2Cu occurs at a much lower temperature than expected on the basis of the (bulk) phase diagram. Moreover, no intermediate phases are observed prior to Al2Cu precipitation. Also the amount of Cu in solid solution (0.20 at%Cu) observed by electron-probe micro-analysis after slowly cooling from 500°C to room temperature, exceeds the solubility of bulk Al-Cu.

Mechanical alloying studies in the Γ(Fe3Zn10) and Γ1(Fe5Zn21) single and mixed phase compositions

1998 ◽  
Vol 13 (5) ◽  
pp. 1177-1185 ◽  
Author(s):  
Aszetta Jordan ◽  
Zhentong Liu ◽  
Oswald N. C. Uwakweh
Keyword(s):  
Differential Scanning Calorimetry ◽  
Stable Equilibrium ◽  
Mixed Phase ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Crystalline Materials ◽  
X Ray ◽  
Dsc Measurements ◽  
Fe Sites

Homogeneous or uniform crystalline materials are obtained following the ball milling of pure elemental powders of Fe and Zn in proportions to yield single phases Γ(Fe3Zn10), Γ1(Fe5Zn21), and Γ + Γ1 mixed phase (Fe25Zn75). Differential scanning calorimetry (DSC) measurements of the as-milled materials show characteristic stages in the temperature range of 50–600 °C prior to establishing stable equilibrium. The activation energies determined from kinetic analyses range from 49 to 189 kJ/mole in these materials. A characteristic stage at 130 °C marking the distinct evolution of the Γ and Γ1 phases from the intermediate or mixed phase composition is identified from XRD measurements. The identification of a unique Fe site with a quadrupole splitting (QS) of 1.5 mm/s in corroboration with x-ray diffraction (XRD) shows that this stage marks the onset of an in situ transformation prior to the distinct evolution of the homogeneous phases. The Mössbauer effect measurement of the as-milled materials are resolved in terms of four unique Fe sites with QS of 1.1, 0.241, 0.073, and 0.0772 mm/s.

scholarly journals Internal Structure Quality Control of Solid Pharmaceuticals. A Comparative Study

2016 ◽  
Vol 62 (1) ◽  
pp. 95-100
Author(s):  
Silvia Imre ◽  
Timea Haidu ◽  
Oana Ponta ◽  
Szende Vancea ◽  
Camil-Eugen Vari ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Diffraction Analysis ◽  
Ursodeoxycholic Acid ◽  
Raw Materials ◽  
Comparative Investigation ◽  
Pharmaceutical Product ◽  
Dissolution Behavior ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

AbstractObjective: The aim of the study was a comparative investigation by spectral and thermal analysis in order to asses a number of characteristics of different varieties ofrawmaterials of ursodeoxycholic acid and ibuprofen. The different dissolution behavior of two ursodeoxycholic acid pharmaceutical product by crystallinity pattern was investigated. Methods: Raw materials of ursodeoxycholic acid and ibuprofen were used. IR spectroscopy, differential scanning calorimetry and X-Ray Diffraction Analysis were applied. Results: The results show no crystallinitydifferences for different batches of the tested drugs. No solid solid transition was proved during sample preparation for transmission IR analysis. Conclusions: A combination of two more affordabletests by IR spectrometry and differential scanning calorimetry lead to the same results as X-Ray diffraction analysis for crystallinity similarity assessment of the studied substances. The dissolution differences of test drugs were not related to the polymorphism of the raw materials.

Formation of Cu2SnSe3 from stacked elemental layers investigated by combined in situ X-ray diffraction and differential scanning calorimetry techniques

2014 ◽  
Vol 588 ◽  
pp. 254-258 ◽  
Author(s):  
Rachmat Adhi Wibowo ◽  
Stefan Moeckel ◽  
Hyesun Yoo ◽  
Astrid Hoelzing ◽  
Rainer Hock ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

Combining in-situ X-ray diffraction with thermogravimetry and differential scanning calorimetry – An investigation of Co 3 O 4 , MnO 2 and PbO 2 for thermochemical energy storage

Solar Energy ◽  
2017 ◽  
Vol 153 ◽  
pp. 11-24 ◽  
Author(s):  
Danny Müller ◽  
Christian Knoll ◽  
Werner Artner ◽  
Michael Harasek ◽  
Christian Gierl-Mayer ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Energy Storage ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray
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