Synthesis, Crystal Structure and Physical Properties of Ba4Ti12O27

2013 ◽  
Vol 566 ◽  
pp. 211-214 ◽  
Author(s):  
Kunimitsu Kataoka ◽  
Hiroshi Hayakawa ◽  
Akira Iyo ◽  
Ken-Ichi Ohshima ◽  
Junji Akimoto
Keyword(s):  
Crystal Structure ◽  
Magnetic Susceptibility ◽  
Solid State ◽  
Barium Titanate ◽  
Physical Properties ◽  
Solid State Reaction ◽  
Polycrystalline Sample ◽  
Van Vleck Paramagnetism ◽  
Van Vleck ◽  
Vleck Paramagnetism

Polycrystalline sample of the reduced barium titanate Ba4Ti12O27 was prepared by solid state reaction in Ar atmosphere. The magnetic susceptibility was nearly temperature independent in the range of 75-300 K, suggesting the Van Vleck Paramagnetism. The temperature dependence of the electric conductivity does not obey any Arrhenius type behavior.

Van Vleck paramagnetism in undoped and Lu-doped bulk ceria

2018 ◽  
Vol 20 (42) ◽  
pp. 27019-27024 ◽  
Author(s):  
Maxim Varenik ◽  
Xiao-Dong Zhang ◽  
Gregory Leitus ◽  
Nimrod Yavo ◽  
Raanan Carmieli ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Van Vleck Paramagnetism ◽  
Van Vleck ◽  
Vleck Paramagnetism

In Lu-doped CeO2 ceramics, the temperature independent magnetic susceptibility, usually attributed to Van Vleck-type magnetization, decreases linearly with Lu content.

scholarly journals Preparation and study the structure of pure and impure barium titanate with Mg2+ ion

2018 ◽  
Vol 16 (37) ◽  
pp. 190-198
Author(s):  
Wasan Abd Alsatar Hekmt
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Barium Titanate ◽  
Solid State Reaction ◽  
Lattice Parameters ◽  
Magnesium Ion ◽  
Solid State Reaction Technique ◽  
Molar Ratios ◽  
Two Temperatures ◽  
Doped Barium Titanate

Pure and doped barium titanate with Mg2+ ion at two molar ratios x= (5%, 10%) mol. has been synthesized by solid state reaction technique. The powders sintered at two temperatures (1000 °C and 1400 °C). An XRD technique was used in order to study the crystal structure of pure and doped barium titanate, which confirmed the formation of the tetragonal phase of BaTiO3, and then calculate the lattice parameters of pure and doped barium titanate, the addition of magnesium ion Mg2+ can lead to decreases lattice parameters.

scholarly journals Preparation and study the structure of pure and impure barium titanate with Mg2+ ion

2018 ◽  
Vol 16 (37) ◽  
pp. 178-189
Author(s):  
Wasan Abd Alsatar Hekmt
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Barium Titanate ◽  
Solid State Reaction ◽  
Lattice Parameters ◽  
Magnesium Ion ◽  
Solid State Reaction Technique ◽  
Molar Ratios ◽  
Two Temperatures ◽  
Doped Barium Titanate

Pure and doped barium titanate with Mg2+ ion at two molar ratios x= (5%, 10%) mol. has been synthesized by solid state reaction technique. The powders sintered at two temperatures (1000 °C and 1400 °C). An XRD technique was used in order to study the crystal structure of pure and doped barium titanate, which confirmed the formation of the tetragonal phase of BaTiO3, and then calculate the lattice parameters of pure and doped barium titanate, the addition of magnesium ion Mg2+ can lead to decreases lattice parameters.

The Synthesis of YBa3Cu4Ox Superconductor and Comparison with YBa2Cu3Ox

2014 ◽  
Vol 979 ◽  
pp. 220-223
Author(s):  
Piyamas Chainok ◽  
Supphadate Sujinnapram ◽  
Tunyanop Nilkamjon ◽  
Sermsuk Ratreng ◽  
Kiattipong Somsri ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Grain Size ◽  
Solid State ◽  
Solid State Reaction ◽  
Profile Analysis ◽  
Analysis Method ◽  
Orthorhombic Structure ◽  
Resistivity Measurements ◽  
Full Profile ◽  
Sem Micrograph

In this research, the Y123 (YBa2Cu3Ox) and Y134 (YBa3Cu4Ox) superconductors were synthesized by solid state reaction and melt process, respectively. The crystal structure of all the samples were then determined using the Rietveld full-profile analysis method to indicate orthorhombic structure. The resistivity measurements showing Tc onset of Y123 lower than Y134 for solid state reaction but higher than Y134 melt process. However, the critical temperature off-set of Y134 has lower than of Y123. The SEM and EDX show that all samples were inhomogeneous. The SEM micrograph for solid state reaction Y123 has many pores between the grain and the grain size clearly demonstrated and bigger than Y134. It was seen that these pores are party eliminated in melt process samples. FTIR spectra detected the trace of carbonate residue in all samples.

scholarly journals β-Li0.37Na0.63Fe(MoO4)2

2014 ◽  
Vol 70 (2) ◽  
pp. i9-i10 ◽  
Author(s):  
Amira Souilem ◽  
Mohamed Faouzi Zid ◽  
Ahmed Driss
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Title Compound ◽  
General Position ◽  
Site Occupancy ◽  
The Other ◽  
Main Structure ◽  
Axis Direction ◽  
A Site

The title compound, lithium/sodium iron(III) bis[orthomolybdate(VI)], was obtained by a solid-state reaction. The main structure units are an FeO6octahedron, a distorted MoO6octahedron and an MoO4tetrahedron sharing corners. The crystal structure is composed of infinite double MoFeO11chains along theb-axis direction linked by corner-sharing to MoO4tetrahedra so as to form Fe2Mo3O19ribbons. The cohesion between ribbonsviamixed Mo—O—Fe bridges leads to layers arranged parallel to thebcplane. Adjacent layers are linked by corners shared between MoO4tetrahedra of one layer and FeO6octahedra of the other layer. The Na+and Li+ions partially occupy the same general position, with a site-occupancy ratio of 0.631 (9):0.369 (1). A comparison is made withAFe(MoO4)2(A= Li, Na, K and Cs) structures.

SYNTHESIS, MORPHOLOGY AND STRUCTURAL PROPERTIES OF (GD,ND)SR2RUCU2O8 SAMPLES

2003 ◽  
Vol 17 (04n06) ◽  
pp. 899-904 ◽  
Author(s):  
A. VECCHIONE ◽  
M. GOMBOS ◽  
C. TEDESCO ◽  
A. IMMIRZI ◽  
L. MARCHESE ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Solid State ◽  
Powder Diffraction ◽  
Solid State Reaction ◽  
X Ray ◽  
Structure And Morphology ◽  
Polycrystalline Powder ◽  
Scanning Electron

NdSr 2 RuCu 2 O x material has been prepared as polycrystalline powder by solid state reaction. The compound has been investigated by synchrotron x-ray powder diffraction and scanning electron microscopy. The experimental results show that the average crystal structure is a disordered cubic perovskite with Nd and Sr cations occupying the same site and the same substitution is found for Cu and Ru atoms. A comparison between the crystal structure and morphology of this compound and the superconducting tetragonal GdSr 2 RuCu 2 O 8 is also discussed.

Thermal enhancement of 2H11/2→4I15/2 up-conversion luminescence of Er3+ doped K2Yb(PO4)(MoO4) phosphors

2021 ◽  
Author(s):  
Hongqiang Cui ◽  
Yongze Cao ◽  
Lei Zhang ◽  
Yuhang Zhang ◽  
Siying Ran ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Reaction Method ◽  
X Ray ◽  
Thermal Enhancement

Er3+ with different concentrations doped K2Yb(PO4)(MoO4) phosphors were prepared by a solid-state reaction method, and the layered orthorhombic crystal structure of the samples was confirmed by X-ray diffraction (XRD). Under...

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