scholarly journals Morphological and Structural Analysis of Nd1(Fe)0.2Ba1.8Cu3O7-δ Oxide Material

2020 ◽  
Vol 855 ◽  
pp. 117-122
Author(s):  
Eko Hadi Sujiono ◽  
Nurul Fitriyah Mahendi ◽  
Abdul Haris ◽  
M. Yusriadi Dahlan ◽  
Bunga Dara Amin ◽  
...  
Keyword(s):  
Single Phase ◽  
Treatment Process ◽  
Lattice Parameter ◽  
Oxide Material ◽  
Oxide Materials ◽  
X Ray Diffraction ◽  
Phase Form ◽  
Heat Time ◽  
X Ray ◽  
Size Estimates

Nd1(Fe)0.2Ba1.8Cu3O7-δ oxide material have been successfully synthesized by solid-state reaction with modified heat treatment process to improve the heat time efficiency, calcination at 950°C for six hours, sintering at 975°C fo six hours, and annealing at 450°C for six hours, respectively. The X-ray diffraction pattern shows that a single-phase form of Nd1(Fe)0.2Ba1.8Cu3O7-δ is an orthorhombic (Pmmm) structure. The Rietveld refinement analysis found, the lattice parameter are a = 3.8758Å, b = 3.9101Å, and c = 11.7190Å with χ2 = 1.394%. The SEM-EDAX image shows that the samples are form clusters with size estimates of 10 - 40μm, and the elemental composition of the oxide materials is Ba rich.

STUDY OF STRUCTURAL, ELECTRICAL TRANSPORT AND MAGNETIC PROPERTIES IN La1-xAgxMnO3 COMPOUNDS

2004 ◽  
Vol 18 (05n06) ◽  
pp. 221-231 ◽  
Author(s):  
MANORANJAN KAR ◽  
S. RAVI
Keyword(s):  
Magnetic Field ◽  
Electrical Transport ◽  
Single Phase ◽  
Ac Susceptibility ◽  
X Ray Diffraction ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Phase Form ◽  
X Ray ◽  
Maximum Value

X-ray diffraction, electrical resistivity and ac susceptibility measurements have been carried out on La 1-x Ag x MnO 3 compounds for x=0.05 to 0.30. These samples are found to be in single phase form with [Formula: see text] space group and with typical lattice parameters a=b=5.524Å and c=13.349Å for x=0.05 sample. The Mn–O–Mn bond angles and variance, σ2 are found to increase with doping. Metal-insulator transitions in the temperature range 254 to 259 K have been observed. These materials exhibit paramagnetic to ferromagnetic transitions in the vicinity of metal-insulator transition temperatures. The paramagnetic susceptibility could be analyzed using Curie–Weiss law. All the above samples exhibit colossal magneto-resistivity and its maximum value is found to be 73% for x=0.15 sample at 50 kOe magnetic field.

scholarly journals X-ray, IR and SEM studies on some Li-Cd ferrites

YMER Digital ◽  
2021 ◽  
Vol 20 (12) ◽  
pp. 333-340
Author(s):  
Sudhir Kulkarni ◽  
Keyword(s):  
Grain Size ◽  
Room Temperature ◽  
Single Phase ◽  
Lattice Parameter ◽  
Lithium Ferrite ◽  
Cadmium Content ◽  
X Ray Diffraction ◽  
Ceramic Method ◽  
X Ray ◽  
Single Phase Formation

Lithium-Cadmium ferrites with general formula Li0.5-x/2 Fe2.5-x/2 Cdx O4 (with x = 0,0.1,0.2....,0.7) were prepared by standard ceramic method. X-ray diffraction studies confirms single phase formation and lattice parameters were calculated. The crystal structure is cubic and lattice parameter increases with increasing Cd content. The infrared absorption (IR) spectra of all the samples were recorded in the range 200-800 cm-1 at room temperature in the KBr medium. Lithium ferrite shows four principal bands and some shoulders have been observed. The force constants Kt and Ko were calculated using Waldron's analysis. Scanning electron microscopy studies shows increase in grain size up to x = 0.1 and then the grain size decreases with increase in cadmium content.

The Structure and Electric Field Dependent Dielectric Properties of Annealed Sr1−xBaxTio3 Ferroelectric Thin Films

1995 ◽  
Vol 401 ◽  
Author(s):  
L.A. Knauss ◽  
J.M. Pond ◽  
J.S. Horwitz ◽  
C.H. Mueller ◽  
R.E. Treece ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Single Phase ◽  
Pulsed Laser ◽  
Lattice Parameter ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Deposited Films ◽  
Post Deposition

AbstractThe effect of a post deposition anneal on the structure and dielectric properties of epitaxial Sr1−x, BaxTiO3 (SBT) thin films with x = 0.35, 0.50 and 0.60 has been measured. The films were grown by pulsed laser deposition on LaAlO3(001) substrates at 750°C in 350 mTorr of oxygen. The asdeposited films were single phase, (001) oriented with 0)-scan widths for the (002) reflection between 0.160 and 0.50'. The dielectric properties of the as-deposited films exhibit a broad temperature dependence and a peak which is as much as 50 K below the peak in bulk SBT. Also, the lattice parameter, as measured by x-ray diffraction, of the as-deposited films was larger than the bulk indicating strain in the films. The as-deposited films were annealed for 8 hours at 900°C in oxygen. The dielectric properties of the annealed films were closer to that of bulk SBT and the lattice parameter was closer to the bulk lattice parameter indicating a reduction of strain. Annealing of as-deposited films also resulted in an increased dielectric tuning without increased dielectric loss.

La-Doped CaCu3Ti4O12 Ceramics Sintered in Argon Environment

2010 ◽  
Vol 173 ◽  
pp. 167-172
Author(s):  
N. Shafiza Afzan Sharif ◽  
Sabar Derita Hutagalung ◽  
Zainal A. Ahmad
Keyword(s):  
Single Phase ◽  
Xrd Analysis ◽  
Lattice Parameter ◽  
Lattice Expansion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Group A ◽  
Cubic Structure ◽  
A Minor ◽  
La Doped

The properties of undoped and La-doped CaCu3Ti4O12 ceramics synthesized via solid state reaction under argon environment had been studied. It was found that La-doped CCTOs gave higher dielectric constant and lower dielectric loss than undoped CCTO. X-ray diffraction (XRD) analysis indicated that all of the sintered samples have single-phase cubic structure (space group ). A minor shifted was observed in the peak positions for La-doped samples, which are attributed to the lattice expansion. The lattice parameter obtained from XRD analysis is 7.348 Å for undoped CCTO and increases to 7.348 – 7.377 Å for La-doped CCTOs. The results proven that La ions have effectively substituted into the Ca site of CCTO.

An Approach to the Automation of a Multifunction X-Ray Diffraction Laboratory

1980 ◽  
Vol 24 ◽  
pp. 121-122
Author(s):  
T. L. Nunes
Keyword(s):  
Data Storage ◽  
Lattice Parameter ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
X Ray ◽  
Program Library ◽  
Common Control ◽  
Storage Area ◽  
Technique Development ◽  
Size Estimates

A variety of x-ray diffractometers supporting stress measurements, routine phase identification, precision lattice parameter determinations, crystallite size estimates, and high temperature studies have been interfaced to a central minicomputer. The unique attributes of each instrument have been retained while the central minicomputer provides a common control format, data storage area, and analysis program library. Two movable desk top computers provide limited backup for the minicomputer, and serve as test beds for technique development.

Stoichiometry and Alloying Effects on the Phase Stability and Mechanical Properties of TiCr2-Base Laves Phase Alloys

1994 ◽  
Vol 364 ◽  
Author(s):  
Katherine C. Chen ◽  
Samuel M. Allen ◽  
James D. Livingston
Keyword(s):  
Fracture Toughness ◽  
Single Phase ◽  
Lattice Parameter ◽  
Phase Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Composition Effects ◽  
Different Temperatures ◽  
Diffraction Lattice ◽  
Alloying Effects

AbstractTi-Cr alloys near the TiCr2 composition have been studied to determine the single-phase Laves field and the associated defects accompanying off-stoichiometry. A combination of metallography, x-ray diffraction, lattice parameter measurements, density measurements and electron microprobe analysis have been used to establish a narrow single-phase region extending towards Ti-rich compositions. All three Laves crystal structures (C14, C36 and C15) were found to exist at different temperatures. Hardness and fracture toughness values determined by Vickers microindentation were studied as a function of alloy composition. Effects of adding Fe, Nb, Mo, and V to TiCr2 on lattice parameter, crystal structure, hardness and fracture toughness are reported.

Search for New Semiconductors for High Temperature Applications:The BaPb1-x BixO3 System

1998 ◽  
Vol 512 ◽  
Author(s):  
V. Ponnambalam ◽  
U. V. Varadaraju
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Single Phase ◽  
Random Distribution ◽  
Lattice Parameter ◽  
Cubic Phase ◽  
Linear Variation ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Power Factor

ABSTRACTBaPbl-xBixO3 phases with 0.6⋚ x⋚ 1.0 were synthesized by high temperature solid state reaction. Powder X-ray diffraction measurements show that all compositions are in single phase. Linear variation of lattice parameter is observed in BaPb1-xBixO3 with change in x indicating the random distribution of Pb in Bi sites. The activation energies for conduction of phases with x=0.8−0.6 obtained from ρ −T plots are same suggesting that the band gap does not change for compositions with x-0.8−0.6. The low activation energy obtained for BaBiO3 can be attributed to the structure of the compound. S versus (1000/T) data of x=1.0−0.8 exhibit a two-slope behavior. The orthorhombic to cubic phase transition could be the possible reason for the high power factor values of BaBiO3.

scholarly journals Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

2012 ◽  
Vol 4 (3) ◽  
pp. 551-560 ◽  
Author(s):  
Shahida Akhter ◽  
D. P. Paul ◽  
M. A. Hakim ◽  
S. Akhter ◽  
D. K. Saha ◽  
...  
Keyword(s):  
Single Phase ◽  
Sintering Temperature ◽  
Lattice Parameter ◽  
Initial Permeability ◽  
Complex Permeability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zn Concentration ◽  
Zn Ferrite ◽  
Zn Content

Cu-Zn ferrites of composition Cu1-xZnxFe2O4 were prepared by double sintering ceramic technique at 9500C and 10500C for 3 hours and 2 hours, respectively. Structural and magnetic properties of the Cu-Zn ferrites were investigated by using X-ray diffraction, microstructure study and complex permeability behaviour. X-ray analysis indicated the formation of single-phase cubic spinel structure for all samples. The lattice parameter was found to increase with increasing Zn content obeying Vegard’s law. The X-ray and bulk densities of the Cu-Zn ferrite significantly decreased whereas porosity increased with increasing Zn concentration. Micrographs exhibited decrease in grain size with increasing concentrations. The real part ?’of initial permeability remained constant up to certain lower range of frequency after which it decreased to lower value of permeability. ?’ increased with increasing Zn contents up to x = 0.5, after that it decreased with higher Zn content but  was also found to increase with sintering temperature. The possible reasons responsible for change in structural, microstructural and complex permeability with increasing of non-magnetic Zn2+ ion are ascertained.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i3.10798 J. Sci. Res. 4 (3), 551-560 (2012)

X-ray diffraction study of the effect of boron on lattice properties of Ni76Al24

1993 ◽  
Vol 8 (4) ◽  
pp. 741-744 ◽  
Author(s):  
Mohan P.V. Rao ◽  
Murthy K. Satyanarayana ◽  
S.V. Suryanarayana ◽  
Naidu S.V. Nagender
Keyword(s):  
Diffraction Study ◽  
Single Phase ◽  
Lattice Parameter ◽  
Small Addition ◽  
X Ray Diffraction ◽  
Fault Probability ◽  
Two Phase ◽  
X Ray ◽  
Al Content ◽  
Stacking Fault Probability

A small addition of boron is suggested to increase the ductility of the polycrystalline Ni3Al when the Al content is less than 25 at.%. Both metallographic and x-ray investigation have shown the alloys of Ni3Al (24 at.% Al) containing 0.20, 0.42, 0.79, 0.98, and 1.22 at.% B to be of single phase and that of 1.76 at.% B to be of two phase. With the addition of boron, the lattice parameter of the Ni3Al phase is found to increase. Microhardness measurements indicate that initially the hardness decreases for the alloy of 0.20 at.% B, while for the rest of the single phase alloys the hardness is found to increase with further addition of boron. The addition of boron increases the deformation stacking fault probability value except for the alloy with 0.20 at.% B.

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