scholarly journals Study on synthesis and characterization of nano scale spinel Mn0.5Fe2.5O4 by micro-emulsion method

2020 ◽  
Vol 9 (4) ◽  
Author(s):  
Ninh Vu The ◽  
Loc Dinh Xuan ◽  
Tai Tran Anh
Keyword(s):  
Single Phase ◽  
Nitrogen Adsorption ◽  
Synthesis And Characterization ◽  
Spinel Crystal ◽  
X Ray Diffraction ◽  
Emulsion Method ◽  
X Ray ◽  
Micro Emulsion ◽  
Phase Spinel

The single phase of Mn0.5Fe2.5O4 spinel crystals was prepared by the micro-emulsion method with the oil phase is DGDE (diethylene glycol diethyl ether). The characteristics of the materials have been determined by the X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX), Scanning electron microscopy (SEM) and Brunaure-Emmet-Teller (BET) nitrogen adsorption and desorption, Vibration sampling magnetometer (VSM), Fourier transform infrared spectroscopy (FTIR). The results showed that the single phase of Fe0.5Mn0.5Fe2O4 crystalline was formed due to the substitution of Fe by Mn in the Fe3O4 crystal lattice and single phase spinel crystal is formed with the size of 6.7 nm, specific surface area ≈ 193 m2.g-1, the saturation magnetization reaches ≈ 27 emu.g-1.

scholarly journals Study on synthesis and characterization of nano scale spinel Mn0.5¬Fe2..5O4 by micro-emulsion method

2020 ◽  
Vol 9 (4) ◽  
Author(s):  
Ninh Vu The ◽  
Loc Dinh Xuan ◽  
Tai Tran Anh
Keyword(s):  
Single Phase ◽  
Nitrogen Adsorption ◽  
Synthesis And Characterization ◽  
Spinel Crystal ◽  
X Ray Diffraction ◽  
Emulsion Method ◽  
X Ray ◽  
Micro Emulsion ◽  
Phase Spinel

The single phase of Mn0.5Fe2.5O4 spinel crystals was prepared by the micro-emulsion method with the oil phase is DGDE (diethylene glycol diethyl ether). The characteristics of the materials have been determined by the X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX), Scanning electron microscopy (SEM) and Brunaure-Emmet-Teller (BET) nitrogen adsorption and desorption, Vibration sampling magnetometer (VSM), Fourier transform infrared spectroscopy (FTIR). The results showed that the single phase of Fe0.5Mn0.5Fe2O4 crystalline was formed due to the substitution of Fe by Mn in the Fe3O4 crystal lattice and single phase spinel crystal is formed with the size of 6.7 nm, specific surface area ≈ 193 m2.g-1, the saturation magnetization reaches ≈ 27 emu.g-1.

scholarly journals Synthesis and Characterization of the Amidomanganates Rb2[Mn(NH2)4] and Cs2[Mn(NH2)4]

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 676
Author(s):  
Christian Bäucker ◽  
Soeren Bauch ◽  
Rainer Niewa
Keyword(s):  
High Temperature ◽  
Single Phase ◽  
Inert Atmosphere ◽  
High Temperature Phase ◽  
Synthesis And Characterization ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ir Spectroscopic

We report the successful synthesis of Rb2[Mn(NH2)4] and Cs2[Mn(NH2)4] from ammonothermal conditions at 723 K and pressures above 850 bar. Both compounds were obtained single phase according to powder X-ray diffraction. The crystal structures were determined by single crystal X-ray diffraction. For Rb2[Mn(NH2)4] we have obtained the high-temperature phase. The structures are analyzed with respect to the earlier reported alkali metal amidomanganates. Upon heating in inert atmosphere Cs2[Mn(NH2)4] decomposes to manganese nitrides. IR spectroscopic results are reported.

scholarly journals The effect of lanthanum substitution on the coercivity field in oxide permanent magnet based on Ba1-xLaxFe12O19

2019 ◽  
Vol 3 (1) ◽  
pp. 42-49
Author(s):  
I Gusti Agung Putra Adnyana ◽  
Komang Ngurah Suarbawa ◽  
Wisnu Ari Adi ◽  
Ni Nyoman Susi Kesuma Wardani ◽  
Laura Laudensia Senly Jalut
Keyword(s):  
Permanent Magnet ◽  
Remanent Magnetization ◽  
Single Phase ◽  
Pattern Analysis ◽  
Synthesis And Characterization ◽  
Magnetic Domains ◽  
X Ray Diffraction ◽  
X Ray ◽  
Coercivity Field

Synthesis and characterization of Ba1-xLaxFe12O19 based permanent magnet samples with variations in composition (x = 0; 0.02; 0.04; and 0.08) has been done. The method used is a solid state reaction. The phase formation of the sample Ba1-xLaxFe12O19 was carried out at 1200oC for 2 hours. The results of the X-ray diffraction pattern analysis show that all sample compositions have a single phase BaFe12O19. The results of magnetic properties testing using VSM showed that the best coercivity field and remanent magnetization values were obtained at the composition of x = 0.04. The effect of substitution of lanthanum into the barium atom can increase the number of magnetic domains which are indicated by the increase in the coercivity value of the material along with the increasing composition of x. It was concluded that the composition of Ba1-xLaxFe12O19 is a permanent magnet with the best product energy.

Synthesis and Characterization of Mesoporous Carbon with MoO3 Loading via Ultrasonic Assembly

2010 ◽  
Vol 654-656 ◽  
pp. 2277-2280
Author(s):  
Xi Long ◽  
Wen Chen ◽  
Shao Jiang Chen ◽  
Chun Xia Zhao
Keyword(s):  
Electron Microscopy ◽  
Mesoporous Carbon ◽  
Nitrogen Adsorption ◽  
Photoelectron Spectra ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Sol Precursor

Mesoporous carbon with MoO3 loading (MoO3/CMK-3) was obtained via ultrasonic assembly with CMK-3 as the host material and MoO3 as the guest material which was yield from MoO3ּpH2O2ּqH2O sol precursor. The microstructures of such MoO3/CMK-3 composites were characterized by X-ray diffraction (XRD), nitrogen adsorption and desorption, X-ray photoelectron spectra (XPS), Fourier-transform infrared (FTIR) and transmission electron microscopy (TEM). The results show that the method of ultrasonic assembly was efficient to highly disperse MoO3 nanoparticales into the channels of mesoporous carbon.

Synthesis and Characterization of Molecular Sieve SBA-15 and Catalysts Co/SBA-15 and Ru/Co/SBA-15

2014 ◽  
Vol 798-799 ◽  
pp. 100-105 ◽  
Author(s):  
Jocielys Jovelino Rodrigues ◽  
Liliane Andrade Lima ◽  
Gustavo Medeiros de Paula ◽  
Meiry Glaúcia Freire Rodrigues
Keyword(s):  
Molecular Sieve ◽  
High Surface ◽  
Nitrogen Adsorption ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Areas ◽  
Bet Method ◽  
Superficial Area

A series of mesoporous materials have been synthesized in an acid medium, with various structures, such as SBA-15. These materials have many properties which make them potential catalysts. Among these we highlight their high surface areas and pore walls relatively thick, resulting in a greater hydrothermal stability. This work aims at the synthesis and characterization of molecular sieve SBA-15 with molar composition: 1.0 TEOS: 0.017 P123: 5.7 HCl: 193 H2O and Co/SBA-15 and catalysts for the reaction of Ru/Co/SBA-15 Fischer Tropsch process. The materials were characterized by the techniques of X-ray diffraction (XRD), chemical analysis by X-ray spectrometry, energy dispersive (EDX) and Nitrogen adsorption (BET method). X-ray diffraction showed that the calcined cobalt catalyst did not modify the structure of SBA-15 and that Co was present under the form of Co3O4 in the catalyst. The addition of cobalt in the SBA-15 decreased the specific superficial area of the molecular sieve.

Microstructure and Phase Analysis of La0.8Ba0.2TixMn(1-x)O3 System for Microwave Absorber Material (x = 0 – 0.7)

2013 ◽  
Vol 789 ◽  
pp. 97-100 ◽  
Author(s):  
Wisnu Ari Adi ◽  
A. Manaf
Keyword(s):  
Doping Concentration ◽  
Single Phase ◽  
Manganese Atom ◽  
Synthesis And Characterization ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Absorber Material ◽  
Particle Shapes

The synthesis and characterization of the magnetic materials of La0.8Ba0.2Mn (1-x)TixO3 system (x = 0 0.7) by mechanical alloying process have been performed. This magnetic material is prepared by oxides, namely La2O3, BaCO3, MnCO3 and TiO2. The mixture was milled for 10 h and then sintered at 1000 ° C for 10 h. The refinement results of x-ray diffraction pattern showed that the doping concentration (x < 0.5) was a single phase, which has a structure monoclinic (I12/a1) with lattice parameters a = 5.5169(5) Å, b = 5.5437(5) Å and c = 7.8553(7) Å, = 90o and 89.75(1) o, V = 240.25(4) Å3 and 6.345 gr.cm-3. The microstructure analysis showed that the particle shapes was polygonal with the varied particle sizes distributed homogeneously on the surface of the samples. We concluded that the maximum number of titanium atoms substituting manganese atom is around x ~ 0.43 without changing the structure of this system.

MICRO-EMULSION METHOD FOR THE SYNTHESIS AND CHARACTERIZATION OF La, Mn-DOPED Ba3Co2 Fe24O41 Z-TYPE HEXA-NANOFERRITES

2019 ◽  
Vol 26 (10) ◽  
pp. 1950065
Author(s):  
GHULAM FARID ◽  
MUHAMMAD SAIF ◽  
GHULAM MURTAZA ◽  
ATIF HUSSAIN ◽  
MUHAMMAD UMAIR ◽  
...  
Keyword(s):  
Hysteresis Loops ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Emulsion Method ◽  
X Ray ◽  
Ion Doping ◽  
Micro Emulsion ◽  
X Ray Absorption ◽  
Mn Doped

In this report, micro-emulsion method was used to obtain La, Mn-doped Ba3Co2 [Formula: see text][Formula: see text] single-phase Z-type hexa-nanoferrites by maintaining annealing temperature at 1200∘C. X-ray diffraction (XRD) analysis shows lattice parameters, crystallite size, and volume are significantly enhanced by introducing La and Mn ions instead of Ba and Fe, respectively. Moreover, La and Mn ion doping improved the preferred orientation of atoms through the basal plane of Z-type hexaferrite. Field emission scanning electron microscopy (FESEM) study reveals that the surface morphology of La- and Mn-doped Ba3Co2 [Formula: see text][Formula: see text], Z-type ferrites show ultrafine and small particle size. The analysis of X-Ray absorption near edge spectroscopy (XANES) suggests that transition in [Formula: see text] has occurred from 3d core level to empty electronic state above the Fermi level. Furthermore, it is observed that in the Z-type ferrites Co exist as divalent ion and Fe as trivalent ion by analyzing XANES. Vibrating samples magnetometer (VSM) indicated that the samples are ferromagnetic as they have narrow hysteresis loops. The decrease in coercivity is due to paramagnetic dopant element Manganese (Mn).

Synthesis and characterization of partially and fully stabilized zirconia fibers made from an inorganic precursor

2001 ◽  
Vol 16 (8) ◽  
pp. 2384-2390 ◽  
Author(s):  
A. Hartridge ◽  
M. D. Taylor ◽  
A. K. Bhattacharya
Keyword(s):  
Single Phase ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
High Quality ◽  
Creep Properties ◽  
X Ray ◽  
Cubic Structure ◽  
Sol Precursor

Continuous high-quality fibers of yttria-doped zirconia with 4 and 8 mol% yttria were blow spun using an inorganic sol precursor. The fibers were heated and analyzed using scanning electron microscopy, x-ray diffraction, differential thermal/thermogravimetric analysis, and surface area/porosity by nitrogen adsorption. The fibers were of a single-phase cubic structure after crystallization at 529 °C and typically 3.3–5.5 or 7.5–11.5 μm in diameter depending on the composition. Samples of fibers were heated to various temperatures and their friability index and creep properties analyzed using the bend stress relaxation technique and compared to other fibers of similar composition prepared by different solution techniques and commercially available fibers.

Synthesis and characterization of high purity, single phase GaN powder

1995 ◽  
Vol 10 (4) ◽  
pp. 266-268 ◽  
Author(s):  
Cengiz M. Balkas ◽  
Cem Basceri ◽  
Robert F. Davis
Keyword(s):  
High Purity ◽  
Single Phase ◽  
Tube Furnace ◽  
Synthesis And Characterization ◽  
Optimum Temperature ◽  
X Ray Diffraction ◽  
Crushed Material ◽  
X Ray ◽  
Scanning Electron

Synthesis of high-purity, single-phase gallium nitride (GaN) powder has been achieved by reacting molten Ga with flowing ammonia (NH3) in a hot wall tube furnace. The optimum temperature, NH3 flow rate, and position of the boat in the hot wall tube furnace relative to the NH3 inlet for the complete reaction to pure GaN for our system were 975 °C, 400 standard cubic centimeters per minute (seem) and 50 cm, respectively. The X-ray diffraction (XRD) data revealed the GaN to be single phase with a = 3.1891 Å, c = 5.1855 Å, in space group P63mc, Z=2 and Dx =6.089 g cm−3. Scanning electron microscopy revealed a particle size distribution in the crushed material between 1 and 5 μm with most of the particles being ≍1 μm.

Synthesis and characterization of TiN / Ti / AISI 410 coatings

2018 ◽  
Vol 2 (1) ◽  
pp. 7
Author(s):  
S Chirino ◽  
Jaime Diaz ◽  
N Monteblanco ◽  
E Valderrama
Keyword(s):  
Synthesis And Characterization ◽  
Photoemission Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Columnar Grains ◽  
Tin Thin Films ◽  
Steel Aisi ◽  
Interacting Surfaces ◽  
Stainless Steel Aisi

The synthesis and characterization of Ti and TiN thin films of different thicknesses was carried out on a martensitic stainless steel AISI 410 substrate used for tool manufacturing. The mechanical parameters between the interacting surfaces such as thickness, adhesion and hardness were measured. By means of the scanning electron microscope (SEM) the superficial morphology of the Ti/TiN interface was observed, finding that the growth was of columnar grains and by means of EDAX the existence of titanium was verified.  Using X-ray diffraction (XRD) it was possible to observe the presence of residual stresses (~ -3.1 GPa) due to the different crystalline phases in the coating. Under X-ray photoemission spectroscopy (XPS) it was possible to observe the molecular chemical composition of the coating surface, being Ti-N, Ti-N-O and Ti-O the predominant ones.

Sign in / Sign up

Export Citation Format

Share Document