Formation of the minor phase shell on the surface of hypermonotectic alloy powders

2006 ◽  
Vol 54 (2) ◽  
pp. 247-250 ◽  
Author(s):  
J.Z. Zhao
Keyword(s):  
Minor Phase ◽  
Hypermonotectic Alloy

scholarly journals X-RAY DIFFRACTION ANALYSIS OF MRITYUNJAYA RASA

2021 ◽  
Vol 9 (8) ◽  
pp. 1637-1641
Author(s):  
Abhishek Abhishek
Keyword(s):  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Minor Phase ◽  
Major Phase ◽  
X Ray ◽  
Xrd Study

Introduction: Mrityunjaya Rasa is a Herbo-Mineral formulation, mentioned in Jwara Chikitsa along with various Anupana like Madhu, Aardraka Swarasa, and Jeeraka Kashaya with Guda. Ingredients like Shudha Hingula, Shudha Gandhaka, Shudha Vatsanabha, Shudha Tankana, Pippali and Maricha with properties of Tikta, Katu Rasa Teekshna Guna and Deepana-Pachana, Swedajanana, Yogavahi and Jwaraghna action show the significant result on various types of fever. To attain desired qualities in the finished product, it is much needed to check efficacy on modern parameters for standardization purposes. Thus, Mrityunjaya Rasa was subjected to X- ray diffraction spectroscopy to ensure SOPs followed for preparation. Aim: The study aimed to analyse the results of X-ray diffraction spectroscopy of Mrityunjaya Rasa. Materials and Methods: X-ray diffraction spectroscopy of Mrityunjaya Rasa was carried out at MIT–central instrumentation facility – innovation centre, Manipal, Udupi. Results: XRD study indicates that Mrityunjaya Rasa contains HgS (cinnabar), mercury sulphide in major phase and borax and elements Na, Ca, Mn, Mg, K, P, Zn, C, Cl2, Fe and B in minor phase. Conclusions: Mrityunjaya Rasa contains HgS (cinnabar), mercury sulphide in major phase and borax and other elements like Na, Ca, Mn, Mg, K, P, Zn, C, Cl2, Fe, and B are also present. Compounds and elements are present due to ingredients and Shodhana media which were used. This study can be a path for establishing the thumbprint of SOP for Mrityunjaya Rasa, a herbomineral compound formulation. Keywords: Mrityunjaya Rasa, XRD, HgS, S, Borax, Na, Ca, Mn etc.

Microstructural Evolution of Undercooled Ni-40wt%Pb Hypermonotectic Alloy

2005 ◽  
Vol 475-479 ◽  
pp. 2651-2654 ◽  
Author(s):  
Hong Xing Zheng ◽  
Yun Yu ◽  
Jian Guo Li
Keyword(s):  
Microstructural Evolution ◽  
Molten Glass ◽  
Hypermonotectic Alloy ◽  
Granulation Mechanism

Microstructural evolution of bulk undercooled Ni-40wt%Pb hypermonotectic alloy was systematically investigated by using molten glass purification and superheating cycling. Within the achieved undercooling range, the microstructures were classified into three categories. When the undercooling was less than 50K, the microstructure consisted of coarse dendritic grain and interdendritic Pb lumps. Increasing undercooling to the range 100 to 198K, macrosegregation was serious. When the undercooling was up to 292K, refined granular grain with homogeneously distributed fine Pb particles on it formed. The granulation mechanism of granular grains was owing to dendritic disintegration and subsequent recrystallization.

scholarly journals Size distribution and anisotropy of the minor phase droplets in polypropylene/ethylene-octene copolymer blends: Effects of shear and component miscibility

2013 ◽  
Vol 32 (1) ◽  
pp. 9-20 ◽  
Author(s):  
Cheng-zhen Geng ◽  
Yan-ling Zhu ◽  
Guang-hui Yang ◽  
Qiang Fu ◽  
Chao-liang Zhang ◽  
...  
Keyword(s):  
Size Distribution ◽  
Minor Phase ◽  
Copolymer Blends ◽  
Ethylene Octene Copolymer

A Study of Weathering in a Soil Derived from a Biotite-Hornblende Rock

Clay Minerals ◽  
1970 ◽  
Vol 8 (4) ◽  
pp. 435-444 ◽  
Author(s):  
M. J. Wilson ◽  
V. C. Farmer
Keyword(s):  
Single Crystal ◽  
Clay Mineral ◽  
Minor Phase ◽  
Optical Studies ◽  
Thermal Methods ◽  
X Ray

AbstractThe weathering of hornblende in the Rehiran profile has been investigated by optical, X-ray, infrared and differential thermal methods. Optical studies of the fresh hornblende show that it contains discrete lamellar intergrowths of another amphibole which, from infrared evidence, is of an iron-rich nature. This minor phase is selectively weathered in the lower horizons and yields a clay mineral which was identified as interstratified swelling chlorite-saponite. The major hornblende component remains relatively unchanged. Single crystal photographs indicate that the formation of the clay mineral is not structurally controlled by the parent hornblende, although there is a tendency towards alignment along cleavage planes. The clay mineral becomes unstable in the upper part of the profile and could not be detected in the A horizon. Comparisons are made with the findings of other workers.

Sulfides in Leg 37 drill core from the Mid-Atlantic Ridge

1977 ◽  
Vol 14 (4) ◽  
pp. 674-683 ◽  
Author(s):  
Wallace H. MacLean
Keyword(s):  
Deep Ocean ◽  
Minor Element ◽  
Major Elements ◽  
Drill Core ◽  
Minor Phase ◽  
Basalt Glass ◽  
Mid Atlantic Ridge ◽  
A Minor ◽  
Drill Holes ◽  
Good Agreement

Sulfides in 27 samples of drill core from four Leg 37 drill holes have been studied. Pyrite is the most abundant sulfide, averaging 0.39 ± 0.51% of basalt samples. Also present in basalt are sparse (0.0001%) and small (< 8 μm) magmatic globules of finely intergrown pyrrhotite, pentlandite, and chalcopyrite-iss, as well as a few globules composed of only one of these minerals. Larger and more abundant magmatic globules are present in gabbro and peridotite; pyrite is a minor phase in these rocks.Fe, Ni. Cu. and S are the major elements, and Co a minor element in the globules. Averaged Ni/Cu ratios for globules are: 3.3 (peridotite), 1.0 (gabbro). and 0.4 (basalt), the decrease in ratio indicating less normative olivine in the respective parent magmas when the globules were formed.Sulfides in globules in peridotite, and to a lesser extent in gabbro, form distinct grains free of inclusions, and appear to have equilibrated to below 300 °C. In basalt the minerals are finely intergrown and indicate quenching above about 600 °C, with local equilibration at lower temperatures.Three analyses of sulfur in basalt glass ranged from 930 to 1160 ppm, in good agreement with other analyses of deep-ocean basalts.

scholarly journals The Growth and Congregation of Minor Phase

2013 ◽  
Vol 19 (4) ◽  
Author(s):  
Jun Ting ZHANG ◽  
You Hong WANG ◽  
Xiao Chao CUI ◽  
Jin Bao LIN
Keyword(s):  
Minor Phase

Modified Sol-Gel Processing of NiCr2O4 Nanoparticles; Structural Analysis and Optical Band Gap

2017 ◽  
Vol 36 (2) ◽  
pp. 121-125 ◽  
Author(s):  
Morteza Enhessari ◽  
Ali Salehabadi ◽  
Salah Khanahmadzadeh ◽  
Kamal Arkat ◽  
Jalal Nouri
Keyword(s):  
Particle Size ◽  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Complexing Agent ◽  
Minor Phase ◽  
Absorption Bands ◽  
Ammonium Dichromate ◽  
Electrical Devices ◽  
Gel Processing

AbstractNickel Chromite nanoparticles were successfully synthesized via a modified sol-gel method using nickel acetate and ammonium dichromate in melted stearic acid as a complexing agent. The diffractograms of the nanoparticles confirmed a pure formation of NiCr2O4 spinel without any minor phase. The coordination structure of as prepared nanoparticles shows a series of absorption bands below 1,000 cm−1 were evidenced the M-O (Cr-O, Ni-O) bond in the sample. Optical band gap, magnetic properties and color parameters (L*.a*.b*) indicates that the final nanoparticles are optically and magnetically active. The particle size of NiCr2O4 was calculated using Scherrer equation at about 24 nm. Optical band gap obtained at 1.7 eV indicating that NiCr2O4 nanoparticles are semiconductor material and can be used in electrical devices.

scholarly journals Unraveling the complexity of iron oxides at high pressure and temperature: Synthesis of Fe5O6

2015 ◽  
Vol 1 (5) ◽  
pp. e1400260 ◽  
Author(s):  
Barbara Lavina ◽  
Yue Meng
Keyword(s):  
High Pressure ◽  
Iron Oxides ◽  
Critical Role ◽  
Ambient Conditions ◽  
Minor Phase ◽  
Planetary Interiors ◽  
High Pressure And Temperature ◽  
Systematic Behavior ◽  
Iron Coordination ◽  
Redox Equilibria

The iron-oxygen system is the most important reference of rocks’ redox state. Even as minor components, iron oxides can play a critical role in redox equilibria, which affect the speciation of the fluid phases chemical differentiation, melting, and physical properties. Until our recent finding of Fe4O5, iron oxides were assumed to comprise only the polymorphs of FeO, Fe3O4, and Fe2O3. Combining synthesis at high pressure and temperature with microdiffraction mapping, we have identified yet another distinct iron oxide, Fe5O6. The new compound, which has an orthorhombic structure, was obtained in the pressure range from 10 to 20 GPa upon laser heating mixtures of iron and hematite at ~2000 K, and is recoverable to ambient conditions. The high-pressure orthorhombic iron oxides Fe5O6, Fe4O5, and h-Fe3O4 display similar iron coordination geometries and structural arrangements, and indeed exhibit coherent systematic behavior of crystallographic parameters and compressibility. Fe5O6, along with FeO and Fe4O5, is a candidate key minor phase of planetary interiors; as such, it is of major petrological and geochemical importance. We are revealing an unforeseen complexity in the Fe-O system with four different compounds—FeO, Fe5O6, Fe4O5, and h-Fe3O4—in a narrow compositional range (0.75 < Fe/O < 1.0). New, finely spaced oxygen buffers at conditions of the Earth’s mantle can be defined.

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