Structural and Transport Properties of La0.85Te0.15MnO3 Manganite and its Composite with Al2O3

2022 ◽  
Vol 1048 ◽  
pp. 110-120
Author(s):  
D.A. Dadhania ◽  
G.D. Jadav ◽  
S.K. Chavda ◽  
J.A. Bhalodia
Keyword(s):  
Secondary Phase ◽  
Peak Position ◽  
Rhombohedral Structure ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Nano Powder ◽  
Auto Combustion ◽  
Combustion Technique

The manganite systems investigated during the present work are pure La0.85Te0.15MnO3 (LTMO) and its composite with 12% concentration of Al2O3 nano powder (LTMO + Al2O3). The materials were prepared by the modified auto combustion technique. The samples were characterized by X-ray diffraction. The powder X-ray diffraction pattern of pure LTMO at room temperature shows that sample is in single phase with no detectable secondary phases and the sample have a rhombohedral structure in hexagonal with the space group R3c. The XRD pattern of LTMO + 12% Al2O3 indicates the clear presence of Al2O3 nano phase in the composite. In the present study, the FTIR Spectroscopy of both samples was carried out. It is clear from the Vibrational assignment for the value of corresponding peak position of FTIR spectra that no extra unwanted impurity is present in samples. A quantitative analysis of the energy dispersive spectroscopy (EDS) data indicates that the observed concentration of elements are very close to the calculated values from its chemical formula. R-T measurements reveals that the addition of secondary phase in manganite strongly influenced on electronic and magnetoresistance behaviour. We summarise some of the salient features of the results.

scholarly journals Synthesis, Characterization, and NH3 Sensing Properties of (Zn0.7 Mn0.3-x Cex Fe2O4) Nano-Ferrite

2021 ◽  
Vol 2114 (1) ◽  
pp. 012040
Author(s):  
Laith Saheb ◽  
Tagreed M. Al-Saadi
Keyword(s):  
Recovery Time ◽  
Particle Distribution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Properties ◽  
Auto Combustion ◽  
Cubic Structure ◽  
Sensing Characteristics ◽  
Combustion Technique ◽  
Higher Sensitivity

Abstract This study includes the preparation of novel nano ferrite (Zn0.7 Mn0.3-x Cex Fe2O4) by using the auto combustion technique. For the following molar values, the percentage x was calculated: 0.0, 0.05, 0.1, 0.15, 0.2, 0.25, and 0.3. The nano-ferrite was calcined for 2 hours at 500°C. The energy dispersive x-ray spectroscopy (EDX), X-ray diffraction (XRD) and field emission scanning electron microscopy FE-SEM was used to examine structural, morphological, and sensing properties. The spinel cubic structure was revealed by XRD findings. The particle distribution was shown to contain voids by FE-SEM. The testing of sensing characteristics to NH3 gas indicated that the synthesized nano-ferrite has a small response time ranging from (15.3-25.2) s as well as a small recovery time between (36-58.5) s, also has a higher sensitivity of about 72.23%.

scholarly journals Frequency and Temperature Dependent Dielectric Response of Fe3O4 Nano-crytallites

2014 ◽  
Vol 6 (3) ◽  
pp. 399-406 ◽  
Author(s):  
M. Z. Ansar ◽  
S. Atiq ◽  
K. Alamgir ◽  
S. Nadeem
Keyword(s):  
Magnetite Nanoparticles ◽  
Sol Gel ◽  
Dielectric Behavior ◽  
Tangent Loss ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Dielectric Tangent Loss ◽  
Auto Combustion ◽  
Combustion Technique

Magnetite nanoparticles have been prepared by using sol-gel auto combustion technique. The samples are prepared by using different concentrations of fuel. Structural characterization has been done using X-Ray diffraction technique and it was observed that fuel concentration can affect the structural properties of Magnetite nanoparticles. The dielectric properties for all the samples such as dielectric constant (??), dielectric tangent loss (tan ?) and dielectric loss factor (??) have been studied as a function of frequency and temperature in the range 10 Hz–20 MHz  and it was found that these nanoparticles can be used in microwave devices because of their good dielectric behavior. © 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v6i3.17938 J. Sci. Res. 6 (3), 399-406 (2014)

Ruderman-Kittel-Kasuya-Yosida Magnetic Interactions in Chemically Synthesized Zn-Fe-AlO Nanocrystallites

2013 ◽  
Vol 748 ◽  
pp. 65-69
Author(s):  
Asif Mahmood ◽  
Yousef Al-Zeghayer
Keyword(s):  
Magnetic Interactions ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Ionic Radii ◽  
X Ray ◽  
Wurtzite Crystal Structure ◽  
Auto Combustion ◽  
Phase Pure ◽  
Combustion Technique ◽  
Lower Resistivity

Chemically derived auto-combustion technique is employed to synthesize the Zn0.95-xFe0.05AlxO (x=00.07 in 0.02 increment) nanocrystallites. X-ray diffraction studies of all compositions revealed the phase pure wurtzite crystal structure with space group P63mc. The lattice parameters and crystallite size is changed with doping of Al attributed to the diversity in size of ionic radii. Temperature dependent electrical resistivity shows a decreased trend with the rise of temperature, confirming the semiconductor nature of compositions. The lower resistivity and enhanced saturation magnetization values in Al doped compositions correspond to the increase in density of carriers. Carriers mediated RKKY interactions are found to observe for enhancement of magnetization.

scholarly journals Fabrication of H2S gas sensors using ZnxCu1-xFe2O4 nanoparticles

2020 ◽  
Vol 126 (7) ◽  
Author(s):  
Mohammad Abu Haija ◽  
Mariem Chamakh ◽  
Israa Othman ◽  
Fawzi Banat ◽  
Ahmad I. Ayesh
Keyword(s):  
Gas Sensors ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Ferrite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Auto Combustion ◽  
Multiple Cycles ◽  
Cubic Structure ◽  
Combustion Technique

Abstract Spinel ferrite nanoparticles can be easily retrieved and utilized for multiple cycles due to their magnetic properties. In this work, nanoparticles of a ZnxCu1-xFe2O4 composition were synthesized by employing a sol–gel auto-combustion technique. The morphology, composition, and crystal structure were examined using scanning electron microscopy, infrared spectroscopy, and X-ray diffraction. The produced nanoparticles are in the range of 30–70 nm and manifest spinel cubic structure. The nanoparticles were tested for their sensitivity to H2 and H2S gases, and the Cu-based spinel ferrite nanoparticles were found the most sensitive and selective to H2S gas. Their enhanced response to H2S gas was attributed to the production of metallic CuFeS2 that manifest higher electrical conductivity as compared with CuFe2O4. The fabricated sensors are functional at low temperatures, and consequently, they need low operational power. They are also simple to fabricate with appropriate cost.

Synthesis, Characterization and Magnetic Properties of Cobalt Ferrite Nanoparticles Prepared by Glycine Assisted Sol-Gel Auto-Combustion Technique

2013 ◽  
Vol 209 ◽  
pp. 31-34 ◽  
Author(s):  
A.B. Shinde ◽  
G.H. Kale ◽  
V.N. Dhage ◽  
P.K. Gaikwad ◽  
K.M. Jadhav
Keyword(s):  
Electron Microscopy ◽  
Cobalt Ferrite ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Auto Combustion ◽  
Ray Density ◽  
Combustion Technique ◽  
Scanning Electron

Nano-particles of (38 nm size) cobalt ferrite (CoFe2O4) were synthesized by sol-gel auto-combustion technique using high purity metal nitrates and glycine as a fuel. The characterization studies were conducted by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The analysis of X-ray diffraction pattern suggests that, the prepared CoFe2O4 spinel ferrite possess single phase cubic spinel structure. The most intense peak (311) of the XRD pattern was used to determine the crystallite size. lattice constant and X-ray density were calculated by using XRD data. The values of lattice constant and X-ray density are found to in the reported range but slightly higher as compared to bulk CoFe2O4 sample. The surface morphology of the CoFe2O4samples was examined through scanning electron microscopy (SEM) technique. The result of SEM analysis shows that grain size is of the order of 62 nm. The CoFe2O4 nano-particle exhibit ferromagnetic behavior having saturation magnetization (Ms) and coercivity (Hc) values in the range of 83 emu/gm and 1381 Oe respectively. The high values of saturation magnetization and coercivity gives the evidence of nanocrystalline nature of the prepared CoFe2O4 spinel ferrite.

Nanosize Effects on Magnetic Properties and Peak Shifting of X-Ray Diffraction Pattern of BaFe12O19 Produced by Sol Gel Method

2013 ◽  
Vol 789 ◽  
pp. 87-92 ◽  
Author(s):  
Dwita Suastiyanti ◽  
Bambang Soegijono ◽  
M. Hikam
Keyword(s):  
Magnetic Properties ◽  
Diffraction Pattern ◽  
Single Phase ◽  
Sol Gel ◽  
Peak Position ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method

The formation of barium hexaferrite, BaFe12O19 single phase with nanosize crystalline is very important to get the best performance especially magnetic properties. The samples were prepared by sol gel method in citric acid-metal nitrates system. Hence the mole ratios of Ba2+/Fe3+ were varied at 1:12 and 1:11.5 with pH of 7 in all cases using ammonia solution. The solution was then heated at 80-90°C for 3 to 4 hours. Then it was kept on a pre-heated oven at 150°C. The samples were then heat treated at 450°C for 24 hours. Sintering process was done at 850°C and 1000°C for 10 hours.Crystallite size was calculated by X-Ray Diffraction (XRD) peaks using scherrer formula. To confirm the formation of a single phase, XRD analyses were done by comparing the sample patterns with standard pattern. The peak shifting of pattern could be seen from XRD pattern using rocking curves at extreme certain 2θ. It was used MPS Magnet Physik EP3 Permagraph L to know magnetic characteristics. This method can produce BaFe12O19 nanosize powder, 22-34 nm for crystallite size and 55.59-78.58 nm for particle size. A little diference in nanosize affects the peak shifting of XRD pattern significantly but shows a little difference in magnetic properties especially for samples at 850°C and 1000°C with mole ratio of 1:12 respectively. The well crystalline powder is formed at mole ratio of 1:11.5 at 850°C since it has the finest particle (55.59 nm) and crystalline (21 nm), the highest remanent magnetization (0.161 T) and the lowest intrinsic coersive (275.8 kA/m). It is also fitting exactly to the standard diffraction pattern with the highest value of best Figure of Merit (FoM), 90%. XRD peak position of this sample is almost same with XRD peak position of another sample with sinter temperature 1000°C at same mole ratio.

scholarly journals Effect of Sr-substitution on the structural and magnetoelectric properties of Ni-Zn ferrites

2020 ◽  
Vol 26 (2) ◽  
pp. 1-20
Author(s):  
SC Mazumdar ◽  
AT Trina ◽  
F Alam ◽  
MJ Miah ◽  
MNI Khan
Keyword(s):  
Room Temperature ◽  
Magnetic Hysteresis ◽  
Solid State Reaction Method ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Spinel Type ◽  
Microstructural Investigation ◽  
Xrd Pattern ◽  
X Ray ◽  
Soft Ferrites

Spinel type polycrystalline Ni0.6-xZn0.4SrxFe2O4 (x = 0.0, 0.05, 0.10, 0.15 and 0.20) ferrites are synthesized by solid state reaction method. X-ray diffraction (XRD) pattern reveals the formation of spinel structure with two secondary phases Sr2FeO4 and SrFe12O19 for higher concentration of Sr (0.15 and 0.20). An increase in lattice constant is observed with the increase of Sr content in the lattice. The density of the samples is found to decrease whereas porosity increases with the substitution of Sr2+ ions. Microstructural investigation shows that the grain size increases with the increase of Sr content. Magnetic hysteresis is investigated at room temperature. All the samples exhibit lower coercivity values indicating that the materials belong to the class of soft ferrites. The saturation magnetization is found to decrease with Sr content which is attributed to Néel’s two sub-lattice model of ferrites. The real permeability of the samples remains almost constant up to a certain frequency and then falls rapidly. Improved dielectric constant is observed in the Sr2+ substituted samples. The electrical conduction in these ferrites is explained on the basis of hopping mechanism between the Fe2+ and Fe3+ ions. Bangladesh Journal of Physics, 26(2), 1-20, December 2019

Ferroelectric Properties of Bi0.5(Na0.8K0.2)0.5TiO3 Ceramics

2014 ◽  
Vol 975 ◽  
pp. 3-8 ◽  
Author(s):  
Javier Camargo ◽  
Leandro Ramajo ◽  
Fernando Rubio-Marcos ◽  
Miriam Castro
Keyword(s):  
Sintering Temperature ◽  
Ferroelectric Properties ◽  
Secondary Phase ◽  
Processing Conditions ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Ceramic Powders ◽  
Density Measurements ◽  
X Ray ◽  
Xrd Patterns

Different processing conditions and the effect of secondary phases on ferroelectric properties of Bi0.5(Na0.8K0.2)0.5TiO3(BNKT) are studied. Ceramic powders are prepared by solid state reaction and different sintering temperatures (temperatures between 1075 and 1150°C) are analyzed. Finally, samples are characterized by X-ray diffraction, Raman microspectroscopy, Scanning Electron Microscopy, impedance spectroscopy, and density measurements. Through XRD patterns, the perovskite structure is stabilized; together with small peaks corresponding to a secondary phase associated with K2-xNaxTi6O13phase. Moreover, the content of the secondary phase, d33piezoelectric constant and dielectric properties increase with sintering temperature.

Temperature Dependence of Linear Thermal Expansion of CuGaSe2 Crystals

2012 ◽  
Vol 725 ◽  
pp. 171-174
Author(s):  
Akira Nagaoka ◽  
Kenji Yoshino ◽  
Tomoyasu Taniyama ◽  
Hideto Miyake
Keyword(s):  
Thermal Expansion ◽  
Temperature Dependence ◽  
Linear Thermal Expansion ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Lattice Constants ◽  
Traveling Heater Method ◽  
Increasing Temperature

CuGaSe2 single crystals were grown by a traveling heater method, which is one of the solution growth techniques. The temperature dependence of the X-ray diffraction of CuGaSe2 was determined between 10 and 300 K. The room temeprature XRD pattern of CuGaSe2 corresponds to the ICDD data. No secondary phases are observed in the spectrum. The lattice constant of the a-axis increases and that of the c-axis decreases with increasing temperature. The linear thermal expansion of the c-axis calculated from the lattice constants indicates a negative value from 10 to 100 K.

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