The silver–calcium phase diagram

1969 ◽  
Vol 47 (4) ◽  
pp. 611-614 ◽  
Author(s):  
W. A. Alexander ◽  
L. D. Calvert ◽  
A. Desaulniers ◽  
H. S. Dunsmore ◽  
D. F. Sargent
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Composition Range ◽  
Liquidus Curve ◽  
X Ray Diffraction ◽  
X Ray ◽  
Novel Technique ◽  
New Compounds ◽  
First Time ◽  
Made In

The silver–calcium system has been reinvestigated over the whole composition range by thermal analysis, X-ray diffraction, and metallography. A novel technique has been used to prepare and examine these reactive alloys. In the course of this project four intermetallic compounds have been observed for the first time; while two others, viz., Ag2Ca and AgCa, which were reported before by others, have been confirmed. Three of the new compounds are: Ag8Ca3, Ag3Ca5, and AgCa3, while the fourth was not isolated or examined in detail. Two other compounds which were described in earlier work as Ag4Ca and Ag3Ca, have been found to be Ag9Ca2 and Ag7Ca2, respectively. Major modifications have been made in the liquidus curve and possible reactions in the solid state are indicated.

Sulfone Containing Clay Electrolytes and Their Potential for Li-Rechargeable Batteries

1998 ◽  
Vol 548 ◽  
Author(s):  
Gregory J. Moore ◽  
M. Stanley Whittingham
Keyword(s):  
Thermal Analysis ◽  
Solid State ◽  
Rechargeable Batteries ◽  
Molecular Formula ◽  
X Ray Diffraction ◽  
Impedance Measurements ◽  
X Ray ◽  
Lithium Secondary Batteries ◽  
Solid State Cell ◽  
Made In

ABSTRACTClays have been synthesized and several types of molecules have been intercalated into them to enhance their ionic conductivity. The clay has the molecular formula of Litaeniolite, Li(Mg2Li)Si4O10F2, and the inserted molecules include PEO and two varieties of sulfone, tetramethylene sulfone and ethylmethyl sulfone. These have been made in the interest of electrolytes in lithium secondary batteries in order to produce a truly solid state cell. The products have been thoroughly characterized by x-ray diffraction to verify the uptake of the molecules into the layers, thermal analysis to observe the stabilization of the intercalated molecules, along with impedance measurements to test their conductivity.

scholarly journals Untersuchungen am System Vanadium—Gallium

1966 ◽  
Vol 21 (5) ◽  
pp. 531-540 ◽  
Author(s):  
R. G. Maier ◽  
Y. Uzel ◽  
H. Kandler
Keyword(s):  
Crystal Structure ◽  
Phase Diagram ◽  
Electron Probe ◽  
Liquidus Curve ◽  
X Ray Diffraction ◽  
Equilibrium Conditions ◽  
Electron Probe Analysis ◽  
X Ray ◽  
Oxygen System ◽  
Annealing Experiments

The phase diagram of the vanadium-gallium system was investigated by means of thermoanalysis, microscopy, x-ray diffraction, and electron probe analysis.The liquidus curve was measured in the range from 40—80% Gallium. The existence of the known phases V3Ga (Cr3Si-typ), V6Ga5 (Ti6Sn5-typ), V6Ga7 (Cu5Zn8-typ), V2Ga5 (Mn2Hg5-typ), V4GaO and V5Ga3Ox (Mn5Si3-typ) was reestablished. The existence of V3GaOx and V5 (Ga, Si)3Ox is stated and their crystal structure investigated.It is shown that the oxygen content of he samples greatly influences the equilibrium conditions of the system. By means of annealing experiments and dilatometric measurements the phase diagram of the vanadium-gallium-oxygen system was investigated in the range of small oxygen contents.

STUDY ON PHASE DIAGRAM OF BaO-Y2O3-CuO TERNARY SYSTEM

1987 ◽  
Vol 01 (02) ◽  
pp. 363-365 ◽  
Author(s):  
Guangcan Che ◽  
Jingkui Liang ◽  
Wei Chen ◽  
Sishen Xie ◽  
Yude Yu ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Ternary System ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor

In Ba-R-Cu-O system (R=La, Y) , high Tc superconductor have been discovered (1–3). The room temperature section of the phase diagram in BaO-Y2O3-CuO system has been completed by means of X-ray diffraction, thermal analysis and superconducting measurements.

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.

Synthesis and thermal study of tris(ammonium) hexafluoro metallates(III) of some rare earths

1989 ◽  
Vol 67 (11) ◽  
pp. 1815-1818 ◽  
Author(s):  
S. J. Patwe ◽  
B. N. Wani ◽  
U. R. K. Rao ◽  
K. S. Venkateswarlu
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Hydrogen Fluoride ◽  
Rare Earths ◽  
Room Temperature ◽  
Thermal Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ammonium Hydrogen ◽  
New Compounds

Fluorination of oxides of rare earths using ammonium hydrogen fluoride at room temperature gave new compounds [NH4]3MF6•nH2O, where M = Y, La, Nd, and Pr. In the case of cerium, [NH4]4CeF8 is formed. The course of thermal decomposition of all these compounds is studied by thermogravimetry/differential thermal analysis (TG/DTA) and X-ray powder diffraction (XRD). Keywords: hexafluoro metallates, rare earths, ammonium hydrogen fluoride, thermal decomposition, X-ray diffraction.

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 Mn–V–O system under ambient atmosphere

1999 ◽  
Vol 14 (7) ◽  
pp. 2929-2932 ◽  
Author(s):  
S. K. Chung ◽  
S. J. Shin ◽  
A. A. Andriiko ◽  
P. V. Rudenok
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Ambient Atmosphere ◽  
X Ray Diffraction ◽  
Composition Region ◽  
Thermal Methods ◽  
X Ray ◽  
Ambient Oxygen ◽  
Equilibrium Phases ◽  
Composition I

The products obtained from MnO2–V2O5 mixtures at the ambient oxygen pressure and temperatures up to 900 °C were studied by means of thermal analysis and x-ray diffraction methods. The following phases were found to exist in equilibrium, depending on the composition: (I) Mn2O3–Mn2V2O7, (II) Mn2V2O7–MnV2O6, and (III) V2O5–solid solution of VO2 in MnV2O6. A phase diagram was obtained for the composition region III. The data are instructive for syntheses of manganese vanadates by thermal methods.

Phase Transitions in the Cu-Sb-S System

2008 ◽  
Vol 587-588 ◽  
pp. 435-439 ◽  
Author(s):  
M. Helena Braga ◽  
Jorge A. Ferreira ◽  
C. Lopes ◽  
Luis Filipe Malheiros
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Room Temperature ◽  
Vertical Section ◽  
X Ray Diffraction ◽  
Thermal Transitions ◽  
Experimental Phase ◽  
Experimental Phase Diagram ◽  
X Ray ◽  
Three Samples

The aim of this study is to determine the thermodynamic influence of the presence of Cu3SbS3, Cu2S and Sb2S3 in the formation of Cu12Sb4S13 - equivalent to mineral tetrahedrite. Thus, the Cu-Sb-S system is studied. Twenty three samples, with compositions that essentially lay along the vertical section Cu2S-Sb2S3, were prepared. The samples were analyzed by Electron Microprobe (EPMA) in order to determine the room temperature phases' composition. Samples were also analyzed by Differential Thermal Analysis (DTA/DSC) in order to establish thermal transitions, and by X-Ray Diffraction (XRD), at room and high temperatures, so as to determine the phases that are present in the equilibria at certain temperatures. The experimental phase diagram was established and the results were compared with those available in the literature.

Incommensurate density modulation in a Na-rich plagioclase feldspar:Z-contrast imaging and single-crystal X-ray diffraction study

2016 ◽  
Vol 72 (6) ◽  
pp. 904-915 ◽  
Author(s):  
Huifang Xu ◽  
Shiyun Jin ◽  
Bruce C. Noll
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Composition Range ◽  
Compositional Variation ◽  
X Ray Diffraction ◽  
Contrast Imaging ◽  
Slow Cooling ◽  
X Ray ◽  
Density Modulation ◽  
First Time

Plagioclase feldspars are the most abundant mineral in the Earth's crust. Intermediate plagioclase feldspars commonly display incommensurately modulated or aperiodic structures.Z-contrast images show both Ca–Na ordering and density modulation. The local structure of lamellae domains hasI1-like symmetry. The neighboring lamellae domains are in an inversion twinning relationship. With a state-of-the-art X-ray diffraction unit, second-order satellite reflections (f-reflections) are observed for the first time in andesine (An45), a Na-riche-plagioclase. Thef-reflections indicate a structure with a density modulation which is close to a Ca-riche-plagioclase. The similarity between thise-andesine structure and previously solvede-labradorite structure is confirmed. Refinement of the structure shows density modulation of ∼ 7 mol % in compositional variation of the anorthite (An) component. The results fromZ-contrast imaging and low-temperature single X-ray diffraction (XRD) provide a structure consistent with density modulation. The discovery off-reflections in Na-riche-plagioclase extends the composition range ofe1 structure with density modulation to as low as at least An45, which is the lower end of the composition range of Bøggild intergrowth. The new result supports the loop-shaped solvus for Bøggild intergrowth, below which is a homogenous stable area fore1 structure in the phase diagram. The phase transition betweene2 structure without density modulation ande1 structure with density modulation should happen at low temperature. There is a change in modulation period accompanying the phase transition, as well as higher occupancy of Al in theT1o site. The andesine with density modulation also indicates extremely slow cooling of its host rock.

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