Phase Relation of FeS2-VS2 System and New Phase of Defect Troilite Structure

2011 ◽  
Vol 170 ◽  
pp. 92-96 ◽  
Author(s):  
Yoshihisa Miyata ◽  
Koya Hayashi ◽  
Genta Sakane ◽  
Takaaki Arimoto ◽  
Yasuhiro Katayama ◽  
...  
Keyword(s):  
Magnetic Property ◽  
Transition Temperature ◽  
Rietveld Method ◽  
Diffraction Method ◽  
Silica Tube ◽  
X Ray Diffraction ◽  
Large Defect ◽  
X Ray ◽  
Property Measurement ◽  
New Phase

A large defective troilite (Fe0.9V0.1)0.82S is prepared by a sealed silica-tube method at 800oC and characterized by a powder X-ray diffraction method and using a magnetic property measurement system. The crystal structures of a defective troilite and non defective troilite are analyzed by Rietveld method. The large defect enhances the Fe-Fe pairing and suppresses the waving of Fe-chain along c-direction. The antiferromagnetic property is observed on both troilites. The spin-flip transition temperature of the large defective troilite is 9K.

Influence of Gd Addition on the Structure and Capability of Ni-Mn-In Metamagnetic Shape Memory Alloys

2012 ◽  
Vol 535-537 ◽  
pp. 950-953
Author(s):  
Li Na Bai ◽  
Gui Xing Zheng ◽  
Zhi Jian Duan ◽  
Jian Jun Zhang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Transition Temperature ◽  
Martensitic Transformation ◽  
Room Temperature ◽  
Vibrating Sample Magnetometry ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

The influences of Gd concentration on martensitic transformation and magnetic properties of NiMnIn alloys were investigated by differential scanning calorimetry (DSC) , vibrating sample magnetometry (VSM), X-ray diffraction (XRD) and etc. It is Observed through the experiment: the addition of Gd enhances martensite transition temperature;X-ray diffraction analysis of experimental alloys is revealed that to the mixture is martensite and austenite at room temperature; content of Gd is not proportional to the improvement of magnetic property.

Rietveld refinement of the gadolinium strontium oxide SrGd2O4

2003 ◽  
Vol 18 (4) ◽  
pp. 288-292 ◽  
Author(s):  
H. Chaker ◽  
A. Kabadou ◽  
M. Toumi ◽  
R. Ben Hassen
Keyword(s):  
Rietveld Refinement ◽  
Rietveld Method ◽  
Lattice Parameters ◽  
Related Structure ◽  
Orthorhombic Symmetry ◽  
Strontium Oxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Phase

Powder X-ray diffraction (XRD) data were collected for a new phase of SrGd2O4. Analysis using the Rietveld method was carried out and it was found that the sample crystallizes in the orthorhombic symmetry with CaFe2O4 related structure. The lattice parameters are found to be a=12.0521(2) Å, b=10.1327(2) Å, c=3.4757(4) Å and Z=4. For X-ray data RF=4.9%, RB=7.6%, RP=8.1% and χ2=1.51. The structure can be described as an assembly of bioctahedron [Gd2O10] which are linked together by O2− anions and of dodecahedron of SrO8.

Analysis of Composite Structures on Barium Titanate Fine Particles Using Synchrotron Radiation

2006 ◽  
Vol 301 ◽  
pp. 239-242 ◽  
Author(s):  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
Satoshi Wada ◽  
Masatomo Yashima ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Barium Titanate ◽  
Size Effect ◽  
Composite Structure ◽  
Composite Structures ◽  
Fine Particles ◽  
Rietveld Method ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray

The crystal structures of barium titanate (BaTiO3) fine particles with a size around 140 nm were investigated using a synchrotron radiation X-ray diffraction method. The observed diffraction pattern was analyzed by Rietveld method assuming several models. As a result, it is found that the BaTiO3 fine particles have composite structures include (a) a tetragonal region with a constant c/a ratio, (b) a tetragonal region with gradient c/a ratios and (c) a cubic region. In order to estimate these structures, the partial profile relaxation technique was applied in the Rietveld refinement. It is considered that the composite structure is important for the size effect on BaTiO3 fine particles.

Synthesis and Crystal Structure of a New Oxysulfide Gd6+xTi4 –xS10 – yO6+y (where x ~ 0.04 and y ~ 0.27)

2004 ◽  
Vol 59 (9) ◽  
pp. 963-968 ◽  
Author(s):  
Vincent Meignen ◽  
Alain Meerschaut ◽  
Laurent Cario ◽  
Alain Lafond
Keyword(s):  
Crystal Structure ◽  
Quaternary System ◽  
Fused Silica ◽  
Silica Tube ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Lattice Constants ◽  
New Phase

A new phase in the quaternary system Gd/Ti/S/O was obtained from a mixture of Gd2O3, Gd2S3, TiO2, TiS2 and Ti by a solid state reaction at 1323 K in a sealed fused-silica tube. The structure of Gd6+xTi4−xS10−yO6+y (where x ~ 0.04, and y ~ 0.27), was solved by single-crystal X-ray diffraction, with R(obs) = 2.69% for 2391 reflections (I > 3σ (I)) and 155 variables. This compound crystallizes with four formula units in the orthorhombic space group Pnma, and the lattice constants (Å ): a = 13.991(1), b = 3.7124(2), c = 34.029(3) Å. The structure is built up from the stacking of ribbons of five Gd-polyhedra alternating with ribbons of five Ti- and Gd/Ti-polyhedra along the a-axis. This is the first example of a rare earth (RE) and titanium oxysulfide compound that shows mixed RE/Ti sites together with pure RE- and Ti-sites. Gd6+xTi4−xS10−yO6+y is a mixed-valent titanium oxysulfide in which half of the Ti cations are Ti3+ and half are Ti4+.

Room-Temperature Ferromagnetism in Ni-Doped Na0.5Bi0.5TiO3 Crystals

2011 ◽  
Vol 189-193 ◽  
pp. 622-625 ◽  
Author(s):  
Lin Lin Yang ◽  
Yong Gang Wang ◽  
Yu Jiang Wang ◽  
Xiao Feng Wang
Keyword(s):  
Magnetic Property ◽  
Measurement System ◽  
Room Temperature ◽  
Doping Concentration ◽  
Room Temperature Ferromagnetism ◽  
X Ray Diffraction ◽  
Multiferroic Materials ◽  
Ni Doping ◽  
X Ray ◽  
Property Measurement

Ni-doped Na0.5Bi0.5TiO3 crystals were synthesized and studied by X-ray diffraction (XRD), X-ray spectroscopy (EDS), and magnetic property measurement system (MPMS). Room-temperature ferromagnetism has been observed in Ni-doped Na0.5Bi0.5TiO3 crystals. It was found that the magnetism of NBT crystals can be controlled by Ni doping concentration. The magnetism of the Ni-doped Na0.5Bi0.5TiO3 crystals develops from diamagnetism to ferromagnetism and paramagnetism on increasing Ni doping concentration from 0 to 1.25mol %. The results presented in this study may provide an approach to widely exploring more multiferroic materials.

Synthesis, crystal structure, and anisotropic thermal expansion of Dy4.67(SiO4)3O

2004 ◽  
Vol 19 (8) ◽  
pp. 2330-2335 ◽  
Author(s):  
S.T. Misture ◽  
S.P. Harvey ◽  
R.T. Francy ◽  
Y. Gao S. DeCarr ◽  
S.C. Bancheri
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Volume Expansion ◽  
Rietveld Method ◽  
X Ray Diffraction ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Anisotropic Thermal Expansion ◽  
New Phase ◽  
Apatite Type

A new phase in the Dy–Si–O system, Dy4.67(SiO4)3O, was prepared in powderform using the mixed oxide method. Dy4.67(SiO4)3O was first observed at 1300 °C, and phase purity was achieved after 96 h at 1600 °C. The crystal structure was determined using single crystal diffraction using synchrotron radiation, and powder x-ray diffraction data was refined using the Rietveld method. The structure was found to be apatite-type, hexagonal, with space group P63/m and a = b = 0.93883(2) nm,c = 0.67820(1) nm, Z = 2. High-temperature x-ray powder diffraction was used to characterize the anisotropic thermal expansion over the temperature range of 24–1450 °C, providing the axial and cell volume expansion.

Influence of CoO Phase on Structural, Magnetic and Electrical Properties of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3

2010 ◽  
Vol 123-125 ◽  
pp. 125-128
Author(s):  
Jin Long Bian ◽  
Yong Jun Seo ◽  
Geun Woo Kim ◽  
Chang Hoon Sung ◽  
Shalendra Kumar ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Physical Property Measurement System ◽  
Physical Property ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
The Matrix ◽  
Property Measurement ◽  
New Phase

The composites of (1-x)La0.7Ca0.3MnO3/xCoO and (1-x)La0.7Sr0.3MnO3/xCoO (x =0 ~ 0.09) were fabricated by conventional solid state reaction method, and their electrical transport and magnetoresistance (MR%) properties were investigated by physical property measurement system (PPMS). The result of x-ray diffraction (XRD) and scanning electronic microscopy (SEM) indicated that no new phase appeared in the composites except manganites matrix and CoO phases. CoO is mainly distributed at the grain boundaries and surfaces of the matrix. The resistivity LCMO and LSMO based composites were measured in the range 90-320K and 90-400K, respectively. The applied magnetic field is 0T and 0.5T. The observed variation of MR with varying Ca and Sr concentration has been qualitatively investigated.

Fabrication and study the effect of the laser on the properties of the compound Tl2-xHgxBa2-ySryCa2Cu3O10+δ superconductor

2018 ◽  
pp. 168
Author(s):  
A. Kareem Dahash Ali ◽  
Nihad Ali Shafeek
Keyword(s):  
Transition Temperature ◽  
Solid State ◽  
Hydrostatic Pressure ◽  
Electrical Properties ◽  
Co2 Laser ◽  
Temperature Shift ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural And Electrical Properties

This study included the fabrication of    compound (Tl2-xHgxBa2-ySryCa2Cu3O10+δ) in a manner solid state and under hydrostatic pressure ( 8 ton/cm2) and temperature annealing(850°C), and determine the effect of the laser on the structural and electrical properties elements in the compound, and various concentrations of x where (x= 0.1,0.2,0.3 ). Observed by testing the XRD The best ratio of compensation for x is 0.2 as the value of a = b = 5.3899 (A °), c = 36.21 (A °) show that the installation of four-wheel-based type and that the best temperature shift is TC= 142 K  .When you shine a CO2 laser on the models in order to recognize the effect of the laser on these models showed the study of X-ray diffraction of these samples when preparing models with different concentrations of the values ​​of x, the best ratio of compensation is 0.2 which showed an increase in the values ​​of the dimensions of the unit cell a=b = 5.3929 (A °), c = 36.238 (A°). And the best transition temperature after shedding laser is TC=144 K. 

scholarly journals Growth of sillenite Bi12FeO20 single crystals: structural, thermal, optical, photocatalytic features and first principle calculations

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Durga Sankar Vavilapalli ◽  
Ambrose A. Melvin ◽  
F. Bellarmine ◽  
Ramanjaneyulu Mannam ◽  
Srihari Velaga ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Photoelectron Spectroscopy ◽  
Diffraction Method ◽  
Lattice Parameter ◽  
First Principle ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Principle Calculations ◽  
Photodegradation Efficiency

AbstractIdeal sillenite type Bi12FeO20 (BFO) micron sized single crystals have been successfully grown via inexpensive hydrothermal method. The refined single crystal X-ray diffraction data reveals cubic Bi12FeO20 structure with single crystal parameters. Occurrence of rare Fe4+ state is identified via X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The lattice parameter (a) and corresponding molar volume (Vm) of Bi12FeO20 have been measured in the temperature range of 30–700 °C by the X-ray diffraction method. The thermal expansion coefficient (α) 3.93 × 10–5 K−1 was calculated from the measured values of the parameters. Electronic structure and density of states are investigated by first principle calculations. Photoelectrochemical measurements on single crystals with bandgap of 2 eV reveal significant photo response. The photoactivity of as grown crystals were further investigated by degrading organic effluents such as Methylene blue (MB) and Congo red (CR) under natural sunlight. BFO showed photodegradation efficiency about 74.23% and 32.10% for degrading MB and CR respectively. Interesting morphology and microstructure of pointed spearhead like BFO crystals provide a new insight in designing and synthesizing multifunctional single crystals.

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