scholarly journals Influence of zinc substitution on structural, elastic, magnetic and optical properties of cobalt chromium ferrites

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Talat Zeeshan ◽  
Safia Anjum ◽  
Salma Waseem ◽  
Farzana Majid ◽  
Muhammad Danish Ali ◽  
...  
Keyword(s):  
Single Phase ◽  
Lattice Parameter ◽  
Band Gap Energy ◽  
Hysteresis Curve ◽  
Cobalt Chromium ◽  
X Ray ◽  
Cationic Distribution ◽  
Band Position ◽  
Rigidity Modulus ◽  
Ray Density

Abstract The polycrystalline Co1−xZnxCr0.5Fe1.5O4 series with (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) has been synthesized by conventional ceramic rout method. The structural and elastic properties have been investigated by X-ray diffractometer and Fourier transform spectroscopy. Both XRD and FTIR confirm the formation of single phase cubic spinel ferrites. The cationic distribution for all samples has been proposed. The lattice parameter, X-ray density, hoping length, bond length, and packing factors–in accompaniment with variations in the zinc concentration–have been studied. The IR band position has been explained by the cations involved in the structure. The elastic moduli such as Young's modulus, bulk modulus, rigidity modulus and Poison's ratio have bee calculated using force constants. Scanning electron microscope (SEM) observation conveys information about the agglomeration of particles. The hysteresis curve obtained from vibrating sample magneto meter (VSM) conveys information about the soft nature of prepared compositions. The saturation magnetization decreases with addition of zinc ions and coercivity is almost zero. An increase in band gap energy has been observed with addition of zinc by Ultraviolet Visible Spectroscopy (UV-VIS), which is due to small crystallite size.

scholarly journals Crystal Structures and Magnetic Properties of Polyethylene Glycol (PEG-4000) Encapsulated Co0.5Ni0.5Fe2O4 Magnetic Nanoparticles

2018 ◽  
Vol 8 (2) ◽  
pp. 75
Author(s):  
Edi Suharyadi ◽  
Lintang Griyanika ◽  
Joko Utomo ◽  
Ayu Kurnia Agustina ◽  
Takeshi Kato ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Crystallite Size ◽  
Spinel Ferrite ◽  
Lattice Parameter ◽  
X Ray ◽  
Maximum Magnetization ◽  
Peg 4000 ◽  
Significant Difference ◽  
Ray Density ◽  
Xrd Patterns

Nanocrystalline mixed spinel ferrite of Co0.5Ni0.5Fe2O4 magnetic nanoparticles (MNPs) has been successfully synthesized by coprecipitation method and encapsulated by PEG-4000 with various concentrations. X-Ray Diffraction (XRD) patterns showed that nanoparticles contained Co0.5Ni0.5Fe2O4 spinel ferrite with crystallite size of 14.9 nm. After PEG-4000 encapsulation particles size decreased became 7.7 nm. Interaction Co0.5Ni0.5Fe2O4 nanoparticles with long chain PEG-4000 caused the crystal growth trap. Lattice parameter and X-Ray density have no significant difference after encapsulated PEG-4000. The coercivity (𝐻𝑐) of Co0.5Ni0.5Fe2O4 was 214 Oe. The 𝐻𝑐 decreased after PEG-4000 encapsulation became 127 Oe, which is due to the decrease of crystallite size. The maximum magnetization (Mmax) of Co0.5Ni0.5Fe2O4 was 12.0 emu/g, and decreased after PEG-4000 encapsulation to 11.7 emu/g, because PEG-4000 is paramagnetic. After the concentration of PEG-4000 increased, then the amount of paramagnetic material increase which lead maximum magnetization decrease.

scholarly journals Effects Of Cd On Physical And Some Magnetic Properties Of Co-Cd Ferrites

1970 ◽  
Vol 35 (2) ◽  
pp. 229-235 ◽  
Author(s):  
Saroaut Noor ◽  
SS Sikder ◽  
M Samir Ullah ◽  
MA Hakim ◽  
Shireen Akhter
Keyword(s):  
Curie Temperature ◽  
Lattice Parameter ◽  
Initial Permeability ◽  
X Ray Diffraction ◽  
Ceramic Method ◽  
X Ray ◽  
Cobalt Ferrites ◽  
Vegard’S Law ◽  
Ray Density ◽  
Curie Temperature Tc

Polycrystalline samples of Cd substituted cobalt ferrites with composition Co1-xCdxFe2O4 (x = 0.0- 0.6 in steps of 0.1) were prepared by double sintering ceramic method. The samples were sintered at 1050°C for 3 hours. X-ray diffraction pattern of the samples showed single phase cubic spinel structure. It was found that the lattice parameter increases linearly with increasing Cd content following Vegard’s law. The apparent density and X-ray density exhibited similar behavior. The Curie temperature Tc has been determined from the temperature dependence of permeability. It was found that the Curie temperature continuously decreased with increasing Cd content and is attributed to the weakening of JAB exchange interaction. The initial permeability, μ' increases with increasing Cd content up to x = 0.6 and then decreases. Key words: Co-Cd ferrite; Lattice parameter; Permeability DOI: http://dx.doi.org/10.3329/jbas.v35i2.9429 JBAS 2011; 35(2): 229-235

scholarly journals The dissociation of an alloy of copper, iron and nickel Further X -ray work

1944 ◽  
Vol 182 (991) ◽  
pp. 378-387 ◽  
Keyword(s):  
Diffraction Pattern ◽  
Single Phase ◽  
Wave Length ◽  
Periodic Variation ◽  
Lattice Parameter ◽  
X Ray ◽  
Prolonged Annealing ◽  
Periodic State ◽  
Set Up ◽  
Kinetics Of

In a previous paper it was shown that X-ray evidence led to the conclusion that a series of intermediate structures is formed during the dissociation of the alloy Cu 4 FeNi 3 . Attempts to determine these structures failed because they led to X-ray intensities that did not agree with those observed, although their positions were adequately accounted for. In the present paper it is shown that the intensities are modified in a systematic way by extinction, and that, after introducing a correction for extinction, the theory advanced can account for all the data. In the type of structure postulated there is a periodic variation of the lattice parameter. Concentration differences are set up in the alloy at regular intervals, while the coherence of the single-phase lattice remains. The wave-length of the periodicity is of the order of 10 -6 cm. On prolonged annealing at constant temperature the diffraction pattern changes gradually. It is possible to follow the wave-length and the amplitude of the periodic variation as a function of time and temperature over a considerable interval. It has been found that the amplitude is independent of time at a given temperature and that the wave-length increases linearly with the logarithm of time. The values of wave-length and amplitude as a function of time and temperature are reproducible within the limit of error, so that the measurements have a quantitative value. After longer times of annealing the diffraction pattern of t-he periodic state gradually changes into another pattern, which can be explained either by a periodic structure with a range of longer periods or by tetragonal lamellae. The bearing of the present observations on the -kinetics of phase change is discussed.

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 Effect of Calcination Temperatures on the Phase Formation and Microstructure of (Pb1-xSrx)TiO3 Powders

2009 ◽  
Vol 421-422 ◽  
pp. 243-246 ◽  
Author(s):  
R. Sumang ◽  
Theerachai Bongkarn
Keyword(s):  
Single Phase ◽  
Average Particle Size ◽  
Solid State Reaction Method ◽  
Lattice Parameter ◽  
Average Particle ◽  
Reaction Method ◽  
X Ray ◽  
Calcination Temperatures ◽  
Powder Samples ◽  
Scanning Electron

(Pb1-xSrx)TiO3 (PST) (x=0.25, 0.50) powders were synthesized by a mixed oxide solid-state reaction method under various calcination temperatures (600-1100oC). Powder samples were characterized using thermogravimetric (TGA), differential thermal analysis (DTA), x–ray diffractrometer (XRD) and scanning electron microscopy (SEM). The results showed that a single-phase of PST for x=0.25 and 0.50 powders was successfully obtained with a calcination condition of 950 oC for 2 h with a heating/cooling rate of 5oC/min. The TGA-DTA results corresponded to the XRD investigation. The lattice parameter a increased whilst the lattice parameter c decreased with increasing calcination temperatures. The tetragonality of powders decreased with an increase of calcination temperatures. The average particle size of the powders increased with the increase of calcination temperature.

scholarly journals A study of the structural and electrical properties of Ni1-x Cox Fe2O4 ferrites

2019 ◽  
Vol 12 (25) ◽  
pp. 69-79
Author(s):  
Hind Mohammed Hasan
Keyword(s):  
Lattice Parameter ◽  
Dielectric Constants ◽  
X Ray ◽  
Force Microscopy ◽  
Average Grain Size ◽  
Structural And Electrical Properties ◽  
Ray Density ◽  
Diffraction Patterns ◽  
Co Addition ◽  
P Type

Ferrite with general formula Ni1-x Cox Fe2O4(where x=0.0.1,0.3,0.5,0.7, and 0.9), were prepared by standard ceramic technique. The main cubic spinel structure phase for all samples was confirmed by x-ray diffraction patterns. The lattice parameter results were (8.256-8.299 °A). Generally, x -ray density increased with the addition of Cobalt and showed value between (5.452-5.538gm/cm3). Atomic Force Microscopy (AFM) showed that the average grain size and surface roughness was decreasing with the increasing cobalt concentration. Scanning Electron Microscopy images show that grains had an irregular distribution and irregular shape. The A.C conductivity was found to increase with the frequency and the addition of Cobalt, D.C conductivity was found to increase with temperature due to decreases in resistivity. Dielectric constants were noticed to decrease with frequency and Co addition. The Hall coefficient was found to be positive. This demonstrates that the majority of charge carriers are p-type, suggesting that the mechanism of conduction is predominantly caused by hopping of holes.

scholarly journals Obtaining and X-ray Analysis of Cobalt Ferrite Powders Substituted by Nickel Cations

2015 ◽  
Vol 16 (2) ◽  
pp. 351-354
Author(s):  
V.S. Bushkova ◽  
I.P. Yaremiy ◽  
R.V. Ilnitsky ◽  
R.P. Lisovskiy ◽  
M.L. Mokhnatskyi
Keyword(s):  
Cobalt Ferrite ◽  
Sol Gel ◽  
Nickel Content ◽  
Coherent Scattering ◽  
Lattice Parameter ◽  
X Ray ◽  
Nickel Cobalt ◽  
Auto Combustion ◽  
Ray Density ◽  
Average Size

The aim of this work was to create and study of ferrite nickel-cobalt powders, using sol-gel technology with participation of auto-combustion. After completing the process autocombustion was obtained only one phase, which corresponded to  the cubic structure of spinel space group Fd3m. It was found that the average size of coherent scattering regions not exceeding 62 nm. The dependences of the lattice parameter, X-ray density and specific surface area of the ferrite powders from nickel content were found. It was shown that at substitution of cations cobalt on cations nickel latest give preference only B positions, thus displacing part of in the A positions.

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.

scholarly journals Structural, Magnetic and Electrical Properties of Cu-Mg Ferrites

2014 ◽  
Vol 6 (2) ◽  
pp. 205-215 ◽  
Author(s):  
Shahida Akhter ◽  
D.P. Paul ◽  
D.K. Saha ◽  
S.M. Hoque ◽  
M.A. Hakim
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Single Phase ◽  
Lattice Parameter ◽  
Initial Permeability ◽  
Complex Permeability ◽  
X Ray ◽  
Maximum Value ◽  
Electrical And Dielectric Properties ◽  
Mg Content

Cu1-xMgxFe2O4 ferrites with (x = 0.2, 0.4, 0.6, 0.8 and 1.0) has been synthesized by double sintering ceramic technique at 11500C for 2hr and investigated for their structure, microstructure, complex permeability behaviour, DC and AC resistivity, dielectric constant measurements. X-ray analysis indicated the formation of single-phase cubic spinel structure for all samples and the lattice parameter was found to decrease with increasing Mg content. Grain size was found to decrease from 34.36 to 4.16 mm with the increase of Mg contents. The real part of initial permeability (??) remained constant up to certain lower range of frequency after it decreased slightly to lower value of permeability at which imaginary part of permeability (?²) showed a maximum value. The decrease of ?? is observed with the increase of Mg content which is attributed to a decrease of grain size. DC electrical resistivity and dielectric constant decreased with increasing Mg content and AC resistivity decreased with increasing frequency, exhibiting normal ferrimagnetic behaviour. The observed variation of electrical and dielectric properties has been explained on the basis of the electronic hopping frequency between Fe2+ and Fe3+ ions in present samples.  Keywords: Ferrites; XRD; Micrographs; Complex permeability; DC resistivity.  © 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.  doi: http://dx.doi.org/10.3329/jsr.v6i2.17351 J. Sci. Res. 6 (2), 205-215 (2014)  

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