The existence of Ni3MSb phases in ternary nickel-M-antimony systems (where “M” represents aluminum, gallium, or indium)

1991 ◽  
Vol 6 (12) ◽  
pp. 2660-2665 ◽  
Author(s):  
C-H. Jan ◽  
Y.A. Chang
Keyword(s):  
Room Temperature ◽  
Binary Systems ◽  
Ternary Systems ◽  
Nominal Composition ◽  
Diffusion Couples ◽  
X Ray Diffraction ◽  
Melting Points ◽  
X Ray ◽  
Ternary Compounds ◽  
Constituent Binary

Phases of the nominal composition Ni3MSb (where “M” represents aluminum, gallium, or indium) were found to occur in their respective ternary systems. They were analyzed by x-ray diffraction and were found to exhibit the B81.5′ crystal structure, similar to that of Ni3GaAs. These phases were shown by differential thermal analysis (DTA) to be stable between room temperature and their melting points, which were determined to be >1150 °C, 1066 °C, and 1091 °C for Ni3AlSb, Ni3GaSb, and Ni3InSb, respectively. An analysis of their respective constituent binary systems suggested that these phases were not true ternary compounds, but rather represented specific compositions of extensive solid solutions of constituent binary phases. Speculations were made as to the solution behavior of these phases. The Ni3MSb phases were predicted to form initially in nickel/MSb diffusion couples, in an analogy to what is observed in nickel/GaAs diffusion couples.

scholarly journals X-ray diffraction study of structure of CaO-Al2O3-SiO2 ternary compounds in molten and crystalline states

2020 ◽  
Vol 56 (2) ◽  
pp. 269-277
Author(s):  
V.E. Sokol’skii ◽  
D.V. Pruttskov ◽  
O.M. Yakovenko ◽  
V.P. Kazimirov ◽  
O.S. Roik ◽  
...  
Keyword(s):  
Short Range ◽  
Room Temperature ◽  
Short Range Order ◽  
Structural Parameters ◽  
Range Order ◽  
Reverse Monte Carlo ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Ternary Compounds

Anorthite and gehlenite crystalline structure and short-range order of anorthite melt have been studied by X-ray diffraction in the temperature range from room temperature up to ~ 1923 K. The corresponding anorthite and gehlenite phases were identified as well as amorphous component for anorthite samples having identical shape to XRD pattern of the anorthite melt. The structure factor and the radial distribution function of atoms of the anorthite melt were calculated from the X-ray high-temperature experimental data. The partial structural parameters of the short-range order of the melt were reconstructed using Reverse Monte Carlo simulations.

scholarly journals Physical Stability and Viscoelastic Properties of Co-Amorphous Ezetimibe/Simvastatin System

2019 ◽  
Vol 12 (1) ◽  
pp. 40 ◽  
Author(s):  
Justyna Knapik-Kowalczuk ◽  
Krzysztof Chmiel ◽  
Karolina Jurkiewicz ◽  
Natália Correia ◽  
Wiesław Sawicki ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Viscoelastic Properties ◽  
Room Temperature ◽  
Physical Stability ◽  
Ternary Systems ◽  
Storage Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Conditions ◽  
First Time

The purpose of this paper is to examine the physical stability as well as viscoelastic properties of the binary amorphous ezetimibe–simvastatin system. According to our knowledge, this is the first time that such an amorphous composition is prepared and investigated. The tendency toward re-crystallization of the amorphous ezetimibe–simvastatin system, at both standard storage and elevated temperature conditions, have been studied by means of X-ray diffraction (XRD). Our investigations have revealed that simvastatin remarkably improves the physical stability of ezetimibe, despite the fact that it works as a plasticizer. Pure amorphous ezetimibe, when stored at room temperature, begins to re-crystallize after 14 days after amorphization. On the other hand, the ezetimibe-simvastatin binary mixture (at the same storage conditions) is physically stable for at least 1 year. However, the devitrification of the binary amorphous composition was observed at elevated temperature conditions (T = 373 K). Therefore, we used a third compound to hinder the re-crystallization. Finally, both the physical stability as well as viscoelastic properties of the ternary systems containing different concentrations of the latter component have been thoroughly investigated.

scholarly journals SYNTHESIS AND ANTIDEPRESSANT ACTIVITY OF 2-BROMO-1-(THIETAN-3-YL) IMIDAZOLE-4, 5-DICARBOXYLIC ACID DERIVATIVES

2017 ◽  
Vol 9 (8) ◽  
pp. 154
Author(s):  
Ferkat Khaliullin ◽  
Irina Nikitina ◽  
Irina Nikitina ◽  
Anfisa Valieva ◽  
Anfisa Valieva ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Dicarboxylic Acid ◽  
Room Temperature ◽  
Antidepressant Activity ◽  
Tail Suspension ◽  
X Ray Diffraction ◽  
Melting Points ◽  
X Ray ◽  
Single Intraperitoneal Injection ◽  
Low Toxicity

Objective: Synthesis of the salts and diylidenehydrazidеs of 2-bromo-1-(thietan-3-yl) imidazole-4,5-dicarboxylic acid to evaluate the antidepressant activities.Methods: The structures of the synthesised compounds were confirmed by elemental analysis and 1Н NMR spectral data. The melting points of the compounds were determined on a Stuart SMP30 apparatus. The X-ray diffraction data for compound IIc were obtained at room temperature on a Xcalibur Gemini Еos. The antidepressant activity was investigated in the tail suspension and forced swimming tests. The locomotor activity and anxiety were studied in the open field test.Results: All synthesised compounds showed antidepressant activity after single intraperitoneal injection to male mice at doses equimolar to 10 mg/kg of imipramine. One of the compounds, 2-bromo-1-(thietan-3-yl) imidazole-4,5-dicarboxylic acid di[(4-hydroxy-3-methoxyphenyl) methylidenehydrazide], reduced the anxiety and decreased the locomotor activity at statistically significant levels. Other compounds did not have sedative and/or stimulating effects.Conclusion: Among the synthesised 2-bromo-1-(thietan-3-yl) imidazole-4,5-dicarboxylic acid derivatives, compounds with marked antidepressant activity were identified. An obvious advantage of these products is low toxicity.

Room Temperature Ferromagnetism in Powder Form of Sn1-xCrxO2 (x = 0.01, 0.02, 0.03, 0.04 and 0.05) Solid Solution

2009 ◽  
Vol 1201 ◽  
Author(s):  
Kun Xu ◽  
Mitsuru Izumi ◽  
Osami Yanagisawa ◽  
Tetsuya Ida
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Lattice Parameter ◽  
Nominal Composition ◽  
Powder Form ◽  
X Ray Diffraction ◽  
Interstitial Position ◽  
X Ray ◽  
Cr Content ◽  
Structural And Magnetic Properties

AbstractStructural and magnetic properties were investigated in the mixed powders of Sn1-xCrxO2 (x = 0.01, 0.02, 0.03, 0.04 and 0.05) in nominal composition. The lattice parameter observed in (110) x-ray diffraction indicates two step changes with increasing Cr content. The occupation of Cr ion at the interstitial position leads to elongation of the lattice parameter for x = 0.01 to x =0.03. Then, the Cr3+ ions are remarkably substituted into the Sn4+ ion site for x = 0.04 to x = 0.05, which results in shortening of the lattice. The lattice parameters for x = 0.01 and 0.02 are larger than x = 0.03 to 0.05. The room temperature ferromagnetism appeared in the sample with x = 0.01 and reaches maximum at the doping rate of x = 0.02; while the magnetization decreases for x > 0.02 was observed. Present study clearly shows the existence of correlation between appearance of ferromagnetism and the structural change.

Synthesis and structure stability of Ba2CuO3+δ under high pressure

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542024 ◽  
Author(s):  
W. M. Li ◽  
Q. Q. Liu ◽  
Y. Liu ◽  
S. M. Feng ◽  
X. C. Wang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Equation Of State ◽  
Room Temperature ◽  
Text Structure ◽  
Structure Stability ◽  
Nominal Composition ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
X Ray

The [Formula: see text] sample with the nominal composition was synthesized. Powder X-ray diffraction (XRD) experiments confirm that it crystallizes in an orthorhombic structure with space group Immm. The synchrotron powder XRD results suggest that the crystal structure of [Formula: see text] keeps stable under pressure up to 34 GPa at room temperature with nearly isotropic compressibility. The equation of state for [Formula: see text] was obtained. The results offer opportunities to further synthesize and research [Formula: see text] superconductor with tetragonal [Formula: see text] structure.

Magnetic and Microstructural Aspects of the Bulk Metallic Glassy Materials Nd60Fe30Al10

2001 ◽  
Vol 674 ◽  
Author(s):  
N. H. Dan ◽  
N. X. Phuc ◽  
V. H. Ky ◽  
N. M. Hong ◽  
N. Chau ◽  
...  
Keyword(s):  
Room Temperature ◽  
Amorphous Material ◽  
Magnetic Hysteresis ◽  
Degree Of Crystallinity ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
Cast Sample ◽  
X Ray ◽  
Glassy Materials ◽  
Ferromagnetic Bulk

ABSTRACTThe ferromagnetic bulk metallic glass (BMG) Nd60Fe30Al10system exhibits extremely large coercivities at low temperature and moderate coercivities near room temperature. The magnetic hardness, as best evidenced by the onset of magnetic irreversibility, was studied in bulk suction-cast and melt-spun alloys with the nominal composition Nd60Fe30Al10. Systematic x-ray diffraction studies of the degree of crystallinity performed as a function of position within the bulk suction-cast samples is found to correlate with the variation in the room-temperature magnetic hysteresis character. X-ray diffraction data clearly shows the presence of both crystallites and amorphous material on the samples' outmost surfaces; the amorphous phase content increases with distance into the cast sample. These results underscore the importance of solidification conditions and attendant nanophase selection, on the resultant magnetic properties of this class of alloys.

scholarly journals Effect of Storage Conditions on the Thermal Stability and Crystallization Behaviors of Poly(L-Lactide)/Poly(D-Lactide)

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 238
Author(s):  
Tien-Wei Shyr ◽  
Huan-Chieh Ko ◽  
Tzong-Ming Wu ◽  
Meifang Zhu
Keyword(s):  
Thermal Stability ◽  
Room Temperature ◽  
Crystallization Behavior ◽  
Gel Permeation Chromatography ◽  
Storage Conditions ◽  
Aliphatic Polyester ◽  
X Ray Diffraction ◽  
Melting Points ◽  
X Ray ◽  
Thermal Stability Of

Polylactide (PLA) is a biodegradable thermoplastic aliphatic polyester. The thermal stability and crystallization behavior of PLA are extremely sensitive to storage, processing, and usage conditions. This work systematically studied the thermal stability and crystallization behavior of poly(L-lactide) (PLLA), poly(D-lactide) (PDLA), and a PLLA/PDLA (LD) blend, which were stored under two sets of laboratory storage conditions: (1) stored in a vacuum-free desiccator and (2) stored in vacuum-sealed bags. Both were stored at room temperature for 3 years. Gel permeation chromatography results revealed that the PLLA, PDLA, and LD samples hydrolyzed slowly when stored in vacuum-sealed bags and degraded significantly when stored in a vacuum-free desiccator; this process significantly reduced the thermal stability of the samples stored in the vacuum-free desiccator. Owing to hydrolysis, the levorotation and dextrorotation (L- and D-) molecular chains were shortened; consequently, more nuclei were formed, and this caused the melting points of the PLLA, PDLA, and LD samples to decrease and the melting enthalpy of the crystals in these samples to increase. Wide-angle X-ray diffraction analysis revealed that when the L- and D- molecular chains were packed side by side to form stereocomplex crystals and the randomly arranged L- and D- molecular chains were easy hydrolyzed and degraded, this interfered with the formation of homocrystals in LD. When PLLA, PDLA, and LD samples are stored in a vacuum-free desiccator, they will be significantly hydrolyzed, resulting in the formation of only stereocomplex crystals, and no homocrystals are observed.

scholarly journals Phase equilibria in the ternary Ag-Au-Ga system: Isothermal sections at 250°C and 450°C

2017 ◽  
Vol 53 (3) ◽  
pp. 215-222 ◽  
Author(s):  
D. Jendrzejczyk-Handzlik
Keyword(s):  
Phase Equilibria ◽  
Ternary Systems ◽  
X Ray Diffraction ◽  
Isothermal Sections ◽  
X Ray ◽  
Ternary Compounds ◽  
Literature Overview ◽  
Eds Analysis ◽  
Two Temperatures ◽  
Scanning Electron

The ternary Ag-Au-Ga system seems to be interesting in jeweller?s craft as a joint. Moreover, the ternary systems based on gold and silver have found applications in the dental industry. A literature overview of the Ag-Au-Ga system shows that the information about phase equilibria of this system does not exist. In the present work, phase equilibria in the Ag-Au-Ga ternary system have been studied by using scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) analysis and X-ray diffraction analysis (XRD). Twenty two annealed alloys in the 10-70 at.% Ga region have been investigated. Obtained experimental results were compared with the predicted isothermal sections at two temperatures (250?C and 450?C). No ternary compounds are found.

Preparation and Characterization of Sr, Ba Filled Type-I Ge Clathrate Single Crystals

2007 ◽  
Vol 336-338 ◽  
pp. 896-899 ◽  
Author(s):  
Ke Feng Cai ◽  
L.C. Zhang ◽  
Q. Lei
Keyword(s):  
Single Crystals ◽  
Room Temperature ◽  
Nominal Composition ◽  
Type I ◽  
Vibrational Modes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optimum Synthesis ◽  
Good Agreement

Sr or Ba filled type-I Ge clathrate single crystals were prepared using high pure elemental Ga, Ge, and Sr or Ba as the starting materials, and Ga as a flux. Powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), differential scanning calorimeter (DSC) were used to characterize the crystals, respectively. The results show that large and well-crystallized single crystals can be prepared under optimum synthesis condition. The composition of the crystals is in good agreement with the nominal composition (M8Ga16Ge30, M=Sr, Ba). Raman spectra of the single crystals were studied at room temperature and several of the Raman active vibrational modes in the crystals have been identified.

scholarly journals Structural characterization and magnetic response of poly(p-xylylene)–MnSb and MnSb films deposited at cryogenic temperature

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
L. N. Oveshnikov ◽  
S. A. Zav’yalov ◽  
I. N. Trunkin ◽  
D. R. Streltsov ◽  
N. K. Chumakov ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Room Temperature ◽  
Qualitative Change ◽  
Layer Growth ◽  
Nominal Composition ◽  
Polymer Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Complex Correlation ◽  
Spectroscopy Studies

AbstractIn this study, we employed several experimental techniques to investigate structure and magnetic properties of poly(p-xylylene)–MnSb composites synthesized by low-temperature vapor deposition polymerization technique and MnSb films deposited at various temperatures. The presence of MnSb nanocrystallites in the studied films was verified by the results of X-ray diffraction, electron microscopy and Raman spectroscopy studies. The obtained data revealed the formation of Sb-rich sublayer with well-oriented Sb grains near the susbtrate, which seems to act as a buffer for the consequent poly(p-xylylene)–MnSb or MnSb layer growth. Increasing the polymer content results in qualitative change of surface morphology of studied films. At high polymer content the hybrid nanocomposite with MnSb nanoparticles embedded into poly(p-xylylene) matrix is formed. All investigated samples demonstrated detectable ferromagnetic response at room temperature, while the parameters of this response revealed a complex correlation with nominal composition, presented crystal phases and surface morphology of studied films. Estimated values of the Curie temperature of the samples are close to that of bulk MnSb.

Sign in / Sign up

Export Citation Format

Share Document