scholarly journals PHYSICO-CHEMICAL INTERACTION OF THE COPPER AND ANTIMONY IODIDES

2021 ◽  
pp. 43-47
Author(s):  
P.R. Mammadli ◽  
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Chemical Interaction ◽  
Equilibrium Temperature ◽  
Polymorphic Transformations ◽  
X Ray ◽  
Immiscibility Region ◽  
Physico Chemical ◽  
Concentration Interval

The character of the mutual interaction of the components in the CuI-SbI3 system was studied by differential thermal analysis and X-ray phase analysis methods and its phase diagram was constructed. It was found that the system is quasi-binary and forms a monotectic phase diagram. The immiscibility region covers ~15-93 mol% SbI3 concentration interval at the monotectic equilibrium temperature (~ 4930С). The temperatures of polymorphic transformations of the CuI compound in the system drop slightly and these phase transitions take place by metatectic reactions

Growth, Optical Adsorption and Resistivity of (Ga0.6In0.4)2Se3 and (Ga0.594In0.396Er0.01)2Se3 Single Crystals

2013 ◽  
Vol 200 ◽  
pp. 50-53
Author(s):  
Inna A. Ivashchenko ◽  
Volodumur V. Halyan ◽  
Irina V. Danylyuk ◽  
Volodumur Z. Pankevuch ◽  
Georgij Y. Davydyuk ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Band Gap ◽  
Single Crystals ◽  
Optical Band Gap ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vertical Bridgman ◽  
Xrd Method

The phase diagram of the Ga2Se3–In2Se3 system was investigated by differential-thermal analysis (DTA) and X-ray diffraction (XRD) method. The single crystals from the area of existence of the γ2 phase with the compositions (Ga0.6In0.4)2Se3 and (Ga0.594In0.396Er0.01)2Se3 were grown by a vertical Bridgman method. Absorption spectra of the grown crystals were studied. The estimated optical band gap is 1.95±0. 01 eV. The resistance of the single crystals of (Ga0.6In0.4)2Se3 (R=500 MΩ) and (Ga0.594In0.396Er0.01)2Se3 (R=210 MΩ) was measured.

Revised phase diagram for the Nd–Pt system from 35 to 85 at% platinum

2010 ◽  
Vol 43 (1) ◽  
pp. 33-37 ◽  
Author(s):  
Ch. F. Xu ◽  
Z. F. Gu ◽  
G. Cheng ◽  
H. Y. Zhou ◽  
Z. M. Wang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Binary System ◽  
Homogeneity Range ◽  
Low Temperatures ◽  
Polymorphic Transformation ◽  
Structure Type ◽  
X Ray Diffraction ◽  
X Ray

The phase diagram of the Nd–Pt system from 35 to 85 at%Pt has been revised using X-ray diffraction and differential thermal analysis. It is found that the Nd3Pt4phase with the rhombohedral Pd4Pu3structure type is unstable and decomposes into the two neighboring phases NdPt and NdPt2at temperatures ranging approximately from 583 to 1123 K. It is confirmed that the homogeneity range for the Laves phase NdPt2extends from about 68.5 to 75.3 at%Pt in the Nd–Pt binary system. The polymorphic transformation temperature of α-NdPt ⇌ β-NdPt is about 623 K, where the α-NdPt phase with BFe type is stable at low temperatures and the β-NdPt phase with BCr type at high temperatures.

Crystal growth and structure analysis of Sm2−xCexCuO4

2000 ◽  
Vol 15 (9) ◽  
pp. 1905-1910 ◽  
Author(s):  
H. Takeda ◽  
M. Okuno ◽  
M. Ohgaki ◽  
K. Yamashita ◽  
T. Matsumoto
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
Zone Method ◽  
Floating Zone Method ◽  
X Ray ◽  
Quench Method

The phase diagram of the Sm2O3–CuO system was investigated by the combination of the differential thermal analysis and the quench method. The results showed that Sm2CuO4 incongruently melts at about 1220 °C, and that the solid Sm2CuO4 exists in equilibrium with the liquid consisting of 81–95 mol% CuO in the range of 1060–1220 °C. On the basis of the phase diagram, Sm2−xCexCuO4 single crystals were grown by the traveling solvent floating zone method. The crystal structure [space group I4/mmm, a = 3.917(1), c 4 11.899(2) Å] has been refined using single-crystal x-ray diffraction data with a precision corresponding to an R index of 0.02.

Equilibrium phases in the BeSO4-H2O system

1966 ◽  
Vol 19 (5) ◽  
pp. 751 ◽  
Author(s):  
IJ Bear ◽  
AG Turnbull
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Solid Solution ◽  
Differential Thermal Analysis ◽  
Infrared Spectra ◽  
Kcal Mole ◽  
X Ray ◽  
Reversible Transitions ◽  
Equilibrium Phases

The equilibrium phases of the BeSO4-H2O system were studied by vapour hydration of BeSO4 and equilibration of thermally produced mixtures. Tetra-, di-, and mono-hydrate are the stable hydrates with no solid solution regions between them. X-ray and infrared spectra are presented for these hydrates and a provisional phase diagram drawn.��� Reversible transitions of BeS04 were found at 588° and 639°, the latter showing a hysteresis splitting of 4° on cooling. Transition heats of 1.2 ± 0.1 and 0.5 ± 0.1 kcal/mole respectively were found by differential thermal analysis.

scholarly journals Investigation of Bi2O3-rich part of Bi2O3-PbO phase diagram

2017 ◽  
Vol 82 (12) ◽  
pp. 1433-1444
Author(s):  
Aleksandra Dapcevic ◽  
Dejan Poleti ◽  
Ljiljana Karanovic ◽  
Jelena Miladinovic
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
High Temperature ◽  
Phase Diagrams ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Large Field ◽  
X Ray ◽  
Crucial Difference

A new Bi-rich part of Bi2O3?PbO phase diagram was determined using differential thermal analysis and X-ray powder diffraction techniques. Four solid solutions, ?-Bi2O3, ?-Bi2O3, ?-Bi2O3 and ?ss-Bi8Pb5O17, can be distinguished below 37.5 mol % of PbO and one compound, ?2-Bi8Pb5O17. Two of them, ?-Bi2O3 and ?ss-Bi8Pb5O17 are high-temperature phases. The large field of ?-Bi2O3 stability was implemented making the crucial difference comparing to phase diagrams from the Bi2O3?PbO system published so far.

The rhodium/selenium system

1967 ◽  
Vol 45 (2) ◽  
pp. 131-137 ◽  
Author(s):  
T. E. Rummery ◽  
R. D. Heyding
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Powder Diffraction ◽  
Room Temperature ◽  
X Ray ◽  
Diffraction Patterns

The rhodium/selenium system has been examined by room temperature X-ray powder diffraction patterns and by differential thermal analysis. A tentative phase diagram has been obtained. Eleven phases were observed, five of which were previously known. The compounds β-RhSe1.29, α-RhSe1.32, and α-RhSe1.34 have lattices based on the B81 structure; RhSe2+x and RhSe2.67 have defect pyrite lattices. The compound α-RhSe1.95 is isomorphous with IrSe2. The structures of RhSe1±0.1, β-RhSe1.34, α- and β-RhSe1.50, and RhSe1.9 are not yet known.

PENINGKATAN LAJU DISOLUSI ACYCLOVIR DENGAN METODE SISTEM DISPERSI PADAT MENGGUNAKAN POLOXAMER 188

2016 ◽  
Vol 5 (1) ◽  
pp. 6
Author(s):  
Budi Setiawan ◽  
Erizal Zaini ◽  
Salman Umar
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Differential Thermal Analysis ◽  
Fourier Transform Infrared ◽  
X Ray Diffraction ◽  
Poloxamer 188 ◽  
X Ray ◽  
Scanning Electron

Sebuah penelitian tentang sistem dispersi padat dari asiklovir dengan poloxamer 188 telah dilakukan formulasi dengan pencampuran secara fisika dengan rasio 1 : 1, 1 : 3, 1 : 5 dan dispersi padat 1 : 1, 1 : 3, 1 : 5 dan penggilingan 1:1 sebagai pembanding. Dispersi padat dibuat menggunakan metode pencairan (fusi), yang digabung dengan poloxamer 188 pada hotplate kemudian asiklovir dimasukkan ke dalam hasil poloxamer 188 lalu di kocok hingga membentuk masa homogen. Semua formula yang terbentuk termasuk asiklovir poloxamer 188 murni dianalisis karakterisasinya dengan Differential Thermal Analysis (DTA), X-ray Diffraction, Scanning Electron Microscopy (SEM), dan Fourier Transform Infrared (FTIR), kemudian pengambilan dilakukan  (penentuan kadar) mengunakan spektrofotometer UV pada panjang gelombang 257,08 nm dan uji laju disolusi dengan aquadest bebas CO2 menggunakan metode dayung. Hasil pengambilan  (penentuan kadar) menunjukkan bahwa semua formula memenuhi persyaratan farmakope Amerika edisi 30 dan farmakope Indonesia edisi 4 yaitu 95-110%. Sedangkan hasil uji laju disolusi untuk campuran fisik 1: 1, dan dispersi padat 1: 1, dan penggilingan 1: 1 menunjukkan peningkatan yang nyata dibandingkan asiklovir murni. Hal ini juga dapat dilihat dari hasil perhitungan statistik  menggunakan analisis varian satu arah  SPSS 17.

scholarly journals The Potential for Natural Stones from Northeastern Brazil to Be Used in Civil Construction

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 440
Author(s):  
Fabiana Pereira da Costa ◽  
Jucielle Veras Fernandes ◽  
Luiz Ronaldo Lisboa de Melo ◽  
Alisson Mendes Rodrigues ◽  
Romualdo Rodrigues Menezes ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Chemical Resistance ◽  
Mechanical Analysis ◽  
Northeastern Brazil ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Agents ◽  
Natural Stones

Natural stones (limestones, granites, and marble) from mines located in northeastern Brazil were investigated to discover their potential for use in civil construction. The natural stones were characterized by chemical analysis, X-ray diffraction, differential thermal analysis, and optical microscopy. The physical-mechanical properties (apparent density, porosity, water absorption, compressive and flexural strength, impact, and abrasion) and chemical resistance properties were also evaluated. The results of the physical-mechanical analysis indicated that the natural stones investigated have the potential to be used in different environments (interior, exterior), taking into account factors such as people’s circulation and exposure to chemical agents.

scholarly journals X-Ray Investigations of the Low-Temperature Phases of the Organic Metals α- and β-(BEDT-TTF)2I3

1986 ◽  
Vol 41 (11) ◽  
pp. 1319-1324 ◽  
Author(s):  
H. Endres ◽  
H. J. Keller ◽  
R. Swietlik ◽  
D. Schweitzer ◽  
K. Angermund ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Room Temperature ◽  
Unit Cell Volume ◽  
Unit Cell ◽  
Slight Variation ◽  
X Ray ◽  
Organic Metals ◽  
Β Phase ◽  
Α Phase

The structure of single crystals of the organic metals α- and β-(BEDT-TTF)2I3* was determined at 100 K, well below the phase transitions indicated by resistivity and thermopower measurements as well as by differential thermal analysis. In the α-phase no unusual change of the room temperature unit cell but a slight variation in the triiodide network and especially a more pronounced dimerization in one of the two donor stacks have been found. The β-phase develops a superstructure with a unit cell volume three times as large as that at room temperature and with pronounced distortions of the I3--ions.

The Roman Ceramics of Salobrena (Granada-Spain) and their Raw Materials

1992 ◽  
Vol 267 ◽  
Author(s):  
Ana M De Andres ◽  
Isabel MuÑOZ
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Raw Materials ◽  
Third Century ◽  
Western Coast ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Third ◽  
Good Number ◽  
Scanning Electron

ABSTRACTNineteen roman ceramic sherds found near Salobreña (Granada, Spain), in the western coast of the Mediterranean Sea, as well as different ceramic clays from the surroundingsare studied. Both clays and ceramic sherds are characterizad by X-ray diffraction and spectrometry, differential thermal analysis, and scanning electron and optical microscopies. A good number of the ceramic pieces, among which some “Terrae Sigillatae”, have a composition similar to that of the local clays and, thus, have been probably manufactured at Salobreña. Only a few of them have a foreign origin. For most of them, the firing temperature was about 800-850 °C, although some have been produced at 900-1000 °C, and some others at 1000-1100 °C. It is concluded that Salobreña appearsto have been an important settlement just in the third century of the Christian era.

Sign in / Sign up

Export Citation Format

Share Document