scholarly journals Synthesis and some properties of compounds Cu2PrSb3S7 and Cu2ErSb3S7

2020 ◽  
Vol 64 (11) ◽  
pp. 13-17
Author(s):  
Reyhan M. Agayeva ◽  
Keyword(s):  
Electron Microscopy ◽  
Eutectic Point ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dissolution Zone ◽  
Concentration Interval ◽  
Microhardness Testing ◽  
Physicochemical Methods ◽  
Scanning Electron

The phase equilibrium in systems of CuSbS2 – PrSbS3 and CuSbS2 – ErSbS3 has been studied by physicochemical methods (Differential thermal analysis – DTA, X-ray diffraction phase analysis, Scanning Electron Microscopy – SEM analysis and microhardness testing) and their T-x diagrams were drawn. It was determined that both systems are quazibinary and characterized by formation of Cu2LnSb3S7 -type (Ln = Pr, Er) compounds. Cu2PrSb3S7 melts congruently at 1050 K and is the phase with unstable content. Its dissolution zone changes within concentration interval of 32-37 mole% of PrSbS3. Cu2PrSb3S7 divides the system into two sub-systems: CuSbS2-Cu2PrSb3S7 and Cu2PrSb3S7-PrSbS3. Both of sub-systems are eutectic. The coordinates of the eutectic point are like following: 15 mole % PrSbS3, T = 740 K and 50 mole % PrSbS3, T = 790 K. Cu2ErSb3S7 melts at 920 K by decomposition. At 725K between Cu2ErSb3S7 and CuSbS2 compounds in content of 15 mole % of ErSbS3 is formed eutectic balance. 4 mole % of solid solution is formed on base of CuSbS2. Both compounds are crystallized by naffildite-type structure in the form of rhombic syngonia (Cu2PrSb3S7 – a = 1.444; b = 2.146; c = 0.3995 nm; z = 4; Cu2ErSb3S7 – a = 1.430; b = 2.128; c = 0.380 nm; z = 4; stereogroup Pbnm or Pbn21).

Effects of La0.5Sr0.5CoO3 sol concentration on the microstructure and dielectric properties of Ba0.6Sr0.4TiO3 films prepared by sol-gel method on Ti substrate

2012 ◽  
Vol 1494 ◽  
pp. 253-258
Author(s):  
Dan Jiang ◽  
Songwei Han ◽  
Xuelian Zhao ◽  
Jinrong Cheng
Keyword(s):  
Electron Microscopy ◽  
Dielectric Properties ◽  
Sol Gel ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Bst Films ◽  
Scanning Electron

ABSTRACTBa0.6Sr0.4TiO3 (BST) thin films were deposited on La0.5Sr0.5CoO3 (LSCO) buffered Ti substrates. Both BST and LSCO were prepared by sol-gel method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were used to investigate the effect of LSCO sol concentration on the crystallinity and surface morphology of the films. The results show that with the increase of LSCO sol concentration, BST films show variation of the structure and dielectric properties. BST films for LSCO of 0.2 mol/L exhibit a better crystallinity and improved dielectric properties, with the tunability, dielectric constant and tanδ of 30%, 420 and 0.028 respectively.

Laser Cladding Fe-Al Intermetallics Coatings on ZL114A Aluminum Alloy

2012 ◽  
Vol 531-532 ◽  
pp. 208-211
Author(s):  
Hong Ye ◽  
Shi Xin Peng ◽  
Zhong Lin Yan ◽  
Xiao Bin Zhang
Keyword(s):  
Electron Microscopy ◽  
Laser Cladding ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cladding Layer ◽  
Fine Surface ◽  
Microhardness Testing ◽  
Cladding Layers ◽  
Scanning Electron ◽  
Suitable Process

The mixed powders of 70%Fe and 30%Al were precoated, and Fe-Al intermetallics coatings were produced on an aluminum ZL114A alloy by means of laser cladding. The microstructure and hardness of the coatings are analyzed by using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and microhardness testing machines. The results show that a fine surface quality can be obtained under a suitable process parameter of laser. The laser cladding layers are mainly consisted of phases of FeAl3, Fe3Al, FeAl with lump-like, granular, equiaxial and needle-like. The highest microhardness of the cladding layer achieved HV614 and raised 5~6 times in comparison to substrate.

scholarly journals Synthesis of Zeolite NaA from Low Grade (High Impurities) Indonesian Natural Zeolite

2014 ◽  
Vol 14 (2) ◽  
pp. 138-142 ◽  
Author(s):  
Asalil Mustain ◽  
Gede Wibawa ◽  
Mukhammad Furoiddun Nais ◽  
Miftakhul Falah
Keyword(s):  
Electron Microscopy ◽  
Natural Zeolite ◽  
Synthesis Method ◽  
Sem Analysis ◽  
Low Grade ◽  
Framework Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zeolite Naa ◽  
Scanning Electron

The zeolite NaA has been successfully synthesized from the low grade natural zeolite with high impurities. The synthesis method was started by mixing natural zeolite powder with NH4Cl aqueous solution in the reactor as pretreatment. The use of pretreatment was to reduce the impurities contents in the zeolite. The process was followed by alkaline fusion hydrothermal treatment to modify the framework structure of natural zeolite and reduce the SiO2/Al2O3 ratio. Finally, the synthesized zeolite was calcined at 600 °C for 2 h. The final zeolite product was characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the morphology of the zeolite NaA was cubic shape as observed by SEM analysis and the synthesized zeolite NaA with pretreatment gave less impurity than without pretreatment.

scholarly journals Platinum-Containing nanocomposites based on Humic substances from brown coal

2019 ◽  
pp. 39-47 ◽  
Author(s):  
Gania Dolmaa ◽  
Galina Petrovna Aleksandrova ◽  
Marina Vladimerovna Lesnichaya ◽  
Byambajav Nomintsetseg ◽  
Anatoly Nikolaevich Sapojhnikov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Humic Substances ◽  
Brown Coal ◽  
Ultraviolet Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Composition And Structure ◽  
Physicochemical Methods ◽  
Scanning Electron

In the presentreport we look intosynthesized silver and gold-containing nanocomposites based on humic substances. The composition and properties of humic substances isolated from brown coal in Mongolian deposits have beenestablished. The methodology of obtaining platinum-containing nanobiocomposites using a matrix of humic substances is described. Our investigation shows thattheir composition and structure are characterized by a complex of modern physicochemical methods, such as X-ray, energy dispersive spectral microanalysis, infrared spectroscopy (IR), ultraviolet spectroscopy (UV), X-ray diffraction analysis, Scanning electron microscopy (SEM).

scholarly journals X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF) And Scanning Electron Microscopy (SEM) Analysis Of Potsherds, Sungai Batu Complex, Bujang Valley, Kedah Sungai Batu Complex, Bujang Valley, Kedah

Warta Geologi ◽  
2020 ◽  
Vol 46 (3) ◽  
pp. 204-209
Author(s):  
Mohd Hasfarisham Abd Halim ◽  
◽  
Mokhtar Saidin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raw Materials ◽  
Sem Analysis ◽  
Clay Sample ◽  
X Ray Diffraction ◽  
X Ray ◽  
Archaeological Excavations ◽  
Scanning Electron

Archaeological excavations at the Sungai Batu Archeological Complex have unearthed potsherds with monument structures. The discovery of the potsherds enables scientific studies of X-ray diffraction (XRD), X-ray fluorescence (XRF) and Scanning Electron Microscopy (SEM) analysis to be conducted and resolve related issues such as where the raw materials were obtained by the manufacturers. To solve the issue, potsherds were taken from around the ancient river, and scientific analyses was conducted for comparison purposes. Before the clay sample was subjected to the scientific analyses, the samples were cleaned and measured (for weight, thickness and width). Color sampling was also performed. Based on results of the analyses, it clearly shows that the potsherds was produced using raw materials from the ancient river in the Sungai Batu Complex itself and baked at a temperature between 550°C and 650°C.

scholarly journals Zeolite Encapsulated Fe-poprhyrin for Catalytic Oxidation with Iodobenzene Diacetate (PhI(OAc)2)

2017 ◽  
Vol 57 (4) ◽  
Author(s):  
Gholamreza Karimipour ◽  
Maryam Rezaei ◽  
Davoud Ashouri
Keyword(s):  
Electron Microscopy ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Nay Zeolite ◽  
X Ray ◽  
Diphenylacetic Acid ◽  
Ft Ir ◽  
Homogenous Catalyst ◽  
Epoxidation Of Cyclohexene ◽  
Scanning Electron

<em>meso</em>-Tetrakis(3-pyridyl)porphyrinatoiron(III) chloride encapsulated on NaY Zeolite [Fe(T-3-PyP)@NaY] was synthesized as a heterogeneous “ship-in-a-bottle” type catalyst and characterized by Fourier transform infrared (FT-IR), atomic absorption (AA), diffused reflectance UV-Vis (DR UV-Vis), X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The catalytic activity of Fe(T-3-PyP)@NaY was examined for the epoxidation of cyclohexene by PhI(OAc)<sub>2</sub> in CH<sub>3</sub>CN/H<sub>2</sub>O (5:1) and compared to that of Fe(T-3-PyP) as a homogenous catalyst. We found that the heterogeneous catalyst Fe(T-3-PyP)@NaY was stable and reusable for several times, and provided a mild condition and exhibited high activity and selectivity in the oxidation of alkenes to epoxides(16-94%). As representative examples for the use of Fe(T-3-PyP)@NaY/ PhI(OAc)<sub>2</sub> in organic oxidations, oxidation of 4-nitrobenzylalcohol to 4-nitrobenzaldehyde (97 %), oxidative dehydrogenation of diethyl 4-(2,6-dichlorophenyl)-2,6-dimethyl- 1,4-dihydro-3,5-pyridinedicarboxylate to the corresponding pyridine (100 %), diphenylacetic acid to benzophenone (64 %) was achieved.

Microstructure and Properties of Laser Cladding Fe-Al Intermetallics

2013 ◽  
Vol 659 ◽  
pp. 39-42 ◽  
Author(s):  
Hong Ye ◽  
Shi Xin Peng ◽  
Zhong Lin Yan ◽  
Xiao Bin Zhang
Keyword(s):  
Electron Microscopy ◽  
Laser Cladding ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fine Surface ◽  
Microhardness Testing ◽  
High Microhardness ◽  
Cladding Layers ◽  
Scanning Electron ◽  
Suitable Process

Fe-Al intermetallics coatings are prepared on an aluminum alloy ZL114A by laser cladding pure Fe and Al powders. The microstructure and hardness of the coatings are analyzed by using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and microhardness testing machines. The results show that a fine surface quality can be obtained under a suitable process parameter of laser. The laser cladding layers are mainly consisted of FeAl, FeAl3, Fe2Al5 and Fe3Al phases. The two cladding layers (60Fe-40Al, 90Fe-10Al) have high microhardness, which achieve HV520 and HV890.

Preparation of AZO Nanometer Powders by Combustion Synthesis Using Dual Fuel

2011 ◽  
Vol 396-398 ◽  
pp. 429-432
Author(s):  
Xiao Xia Liu ◽  
Hai Lian Qin ◽  
Gui Hua Peng ◽  
Zhen Hua Liang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Grain Size ◽  
Combustion Synthesis ◽  
Sem Analysis ◽  
Dual Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

AZO nanometer powders were prepared by combustion synthesis. The influence on the synthesis of AZO nanometer powders were investigated in conditions of using single fuel or dual fuel by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The results showed that the AZO powders were well-distributed with smaller grain size when using dual fuel.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

Environmental scanning electron microscopy of fresh human gallstones reveals new morphologies of precipitated calcium salts

1992 ◽  
Vol 50 (2) ◽  
pp. 1322-1323
Author(s):  
Howard S. Kaufman ◽  
Keith D. Lillemoe ◽  
John T. Mastovich ◽  
Henry A. Pitt
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Environmental Scanning Electron Microscopy ◽  
Environmental Scanning ◽  
X Ray Diffraction ◽  
Calcium Salts ◽  
Cholesterol Gallstones ◽  
X Ray ◽  
Ca Carbonate ◽  
Scanning Electron

Gallstones contain precipitated cholesterol, calcium salts, and proteins. Calcium (Ca) bilirubinate, palmitate, phosphate, and carbonate occurring in gallstones have variable morphologies but characteristic windowless energy dispersive x-ray (EDX) spectra. Previous studies of gallstone microstructure and composition using scanning electron microscopy (SEM) with EDX have been limited to dehydrated samples. In this state, Ca bilirubinates appear as either glassy masses, which predominate in black pigment stones, or as clusters, which are found mostly in cholesterol gallstones. The three polymorphs of Ca carbonate, calcite, vaterite, and aragonite, have been identified in gallstones by x-ray diffraction, however; the morphologies of these crystals vary in the literature. The purpose of this experiment was to study fresh gallstones by environmental SEM (ESEM) to determine if dehydration affects gallstone Ca salt morphology.Gallstones and bile were obtained fresh at cholecystectomy from 6 patients. To prevent dehydration, stones were stored in bile at 37°C. All samples were studied within 4 days of procurement.

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