On the Relationship between Structural-Elastic Properties of Co-Zn Ferrites at 300 K

2016 ◽  
Vol 1141 ◽  
pp. 147-152 ◽  
Author(s):  
Kunal B. Modi ◽  
Suraj J. Shah ◽  
Chetan R. Kathad ◽  
Devangi K. Sonigra ◽  
Hardik P. Parmar ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Wave Velocity ◽  
Spinel Ferrite ◽  
Empirical Relation ◽  
Atomic Weight ◽  
Ultrasonic Pulse ◽  
X Ray ◽  
Rigidity Modulus ◽  
Ultrasonic Pulse Transmission ◽  
Longitudinal Modulus

The structural - elastic properties correlations have been studied for polycrystalline spinel ferrite system, ZnxCo1-xFe2O4, x = 0.0-0.6, at 300 K. The cation distribution formulae determined from X-ray diffraction line intensity calculations are used to calculate bulk modulus (Ko) in particular and Young′s modulus (E0), rigidity modulus (G0), longitudinal modulus (L0) and Lame′s constant (λL0) in general. The longitudinal wave velocity (Vl0) and transverse wave velocity (Vso) computed from empirical relation based on X-ray density and mean atomic weight is used to calculate L0 and G0 respectively. The applicability of the heterogeneous metal mixture rule for theoretical estimation of elastic constants has been tested. The results are compared with elastic moduli determined from conventional ultrasonic pulse transmission technique and causes for the observed difference between the two have been discussed.

scholarly journals Composition Dependence of Elastic Moduli of Mixed Cobalt-Zinc Ferrites Prepared by Citrate Precursor Method

2019 ◽  
Vol 32 (1) ◽  
pp. 31-35
Author(s):  
Ch. Vinuthna ◽  
Sandupatla Raju ◽  
D. Ravinder
Keyword(s):  
Synthesis Method ◽  
Ultrasonic Pulse ◽  
Elastic Module ◽  
Pulse Transmission ◽  
Precursor Synthesis ◽  
Rigidity Modulus ◽  
Binding Forces ◽  
Ultrasonic Pulse Transmission ◽  
Elastic Modules ◽  
Citrate Precursor

CoxZn1-xFe2O4 nanoparticles were prepared by chemical citrate precursor synthesis method. The Young’s modulus ‘E’ and the rigidity modulus ‘n’ of mixed cobalt-zinc ferrites have been determined by the ultrasonic pulse transmission technique at 1 MHz. The elastic modules of the ferrites were corrected to zero porosity using the formulae of Harselman and Fulrath. The observed variation of the elastic module with composition has been interpreted on the basis of binding forces between the atoms of the spinal lattice. A linear relationship between Debye temperature ØD and average sound velocity Vm has also been observed.

Infrared Spectroscopy and Elastic Properties of Nanocrystalline Mg–Mn Ferrites Prepared by Co-Precipitation Technique

2008 ◽  
Vol 8 (8) ◽  
pp. 4181-4187 ◽  
Author(s):  
T. K. Pathak ◽  
J. J. U. Buch ◽  
U. N. Trivedi ◽  
H. H. Joshi ◽  
K. B. Modi
Keyword(s):  
Elastic Properties ◽  
Spinel Ferrite ◽  
Coarse Grained ◽  
X Rays ◽  
X Ray Diffraction ◽  
Ionic Charge ◽  
X Ray ◽  
Infrared Spectral ◽  
Co Precipitation ◽  
Change In Mean

Nanoparticles having particle size in the range 25–40 nm for compositions x = 0.0, 0.2, 0.4 and 0.5 of MgxMn1−xFe2O4 spinel ferrite system have been prepared by chemical co-precipitation route. The microstructure, infrared spectral and elastic properties have been studied by means of energy dispersive analysis of X-rays (EDAX), transmission electron microscopy (TEM), X-ray diffraction (XRD) and infrared spectroscopic (IR) measurements, before (W) and after high temperature annealing A(W). The force constants for tetrahedral and octahedral sites determined by infrared spectral analysis, lattice constant and X-ray density values by X-ray diffraction pattern analysis; have been used to calculate elastic constants. The magnitude of force constant and elastic moduli for nanocrystalline W-samples are found to be larger as compared to coarse grained A(W)-samples. The results have been explained in the light of redistribution of cations and as a result change in mean ionic charge for such cationic sites, elastic energy and grain size reduction effect of Nanoparticles.

Nondestructive Characterization of Beryllium Effects on Ni-Cr Dental Alloy Elastic Properties and Microstructure: Ultrasonics, X-Ray Diffractometry, Scanning Electron Microscopy and Wavelength Dispersive Spectrometry

1988 ◽  
Vol 142 ◽  
Author(s):  
Surendra Singh ◽  
J. Lawrence Katz ◽  
B. S. Rosenblatt
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Elastic Properties ◽  
Ultrasonic Pulse ◽  
Chemical Compositions ◽  
Transmission Method ◽  
Buoyant Force ◽  
X Ray ◽  
Wavelength Dispersive Spectrometry ◽  
Scanning Electron

AbstractKnowledge of structure-properties relationship is a key factor in the development and improvement of new and existing metal alloys through manipulation in their chemical-compositions. In this study, the elastic properties and microstructure of cast Ni-Cr-Be and Ni-Cr dental alloys were studied. The elastic properties, i.e., Young's, shear and bulk moduli and Poisson's ratios, were determined using measurements on the ultrasonic velocities and densities. Both the shear and the longitudinal (dilatational) velocities were measured using an ultrasonic pulse-through-transmission method; density was measured using a buoyant force method. In microstructure, crystallinity, porosity, particle-size and quantitative elemental compositions were studied using x-ray diffractometry (XRD), scanning electron microscopy (SEM) and wavelength dispersive spectrometry (WDS) respectively. These results show that: (1) the addition of Be increased significantly the alloy's elastic moduli and Poisson's ratio; and (2) the presence of Be in Ni-Cr alloy also significantly modified its microstructure by producing a second binary phase, Ni-Be, in eutectic areas.

scholarly journals Ultrasonic velocity measurements on thin rock samples: Experiment and numerical modeling

Geophysics ◽  
2018 ◽  
Vol 83 (2) ◽  
pp. MR47-MR56 ◽  
Author(s):  
Alexey Yurikov ◽  
Maxim Lebedev ◽  
Marina Pervukhina
Keyword(s):  
Elastic Properties ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Ultrasonic Pulse ◽  
Stress Fields ◽  
Ultrasonic Velocities ◽  
Standard Samples ◽  
Standard Size ◽  
Ultrasonic Pulse Transmission ◽  
Thin Samples

The ultrasonic pulse transmission (UPT) method has been the gold standard for laboratory measurements of rock elastic properties for decades, and it is used by oil and gas industry and service companies routinely. In spite of the wide acceptance and use of the UPT method, experimentalists are still looking for ways to further extend the limits of its applicability and to improve its state-of-the-art practices. One of the problems that limits wider application of the method is the length of the standard samples used (approximately 40–100 mm). This is a crucial limitation either in the case of a damaged core when preparation of a standard size sample is impossible or in the case when an ultrasonic experiment is combined with saturation or desiccation processes that might be extremely time-consuming on the long samples. On the other hand, thinner samples are not typically used due to the implication of inhomogeneity of stress fields inside and whereas few results of the measurements on thin disc samples have been reported in the literature, detailed justifications of the procedures have not been done yet. To fill this gap, we compare ultrasonic velocities measured at confining stresses up to 50 MPa done on standard and thin samples with lengths of 60 and 15 mm, respectively. First, we evaluate a new developed experimental setup for ultrasonic measurements on thin discs and develop a detailed experimental procedure. Then, we use finite-element modeling to numerically simulate stress fields in both types of samples. Finally, we compare the ultrasonic velocities measured on the thin discs and on standard samples and determine how to obtain reliable elastic properties on thin samples.

scholarly journals X-ray Diffraction Analysis and Williamson-Hall Method in USDM Model for Estimating More Accurate Values of Stress-Strain of Unit Cell and Super Cells (2 × 2 × 2) of Hydroxyapatite, Confirmed by Ultrasonic Pulse-Echo Test

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2949
Author(s):  
Marzieh Rabiei ◽  
Arvydas Palevicius ◽  
Amir Dashti ◽  
Sohrab Nasiri ◽  
Ahmad Monshi ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Ultrasonic Pulse ◽  
High Accuracy ◽  
Unit Cell ◽  
Deformation Model ◽  
X Ray Diffraction ◽  
Uniform Deformation ◽  
X Ray ◽  
Pulse Echo

Taking into account X-ray diffraction, one of the well-known methods for calculating the stress-strain of crystals is Williamson-Hall (W–H). The W-H method has three models, namely (1) Uniform deformation model (UDM); (2) Uniform stress deformation model (USDM); and (3) Uniform deformation energy density model (UDEDM). The USDM and UDEDM models are directly related to the modulus of elasticity (E). Young’s modulus is a key parameter in engineering design and materials development. Young’s modulus is considered in USDM and UDEDM models, but in all previous studies, researchers used the average values of Young’s modulus or they calculated Young’s modulus only for a sharp peak of an XRD pattern or they extracted Young’s modulus from the literature. Therefore, these values are not representative of all peaks derived from X-ray diffraction; as a result, these values are not estimated with high accuracy. Nevertheless, in the current study, the W-H method is used considering the all diffracted planes of the unit cell and super cells (2 × 2 × 2) of Hydroxyapatite (HA), and a new method with the high accuracy of the W-H method in the USDM model is presented to calculate stress (σ) and strain (ε). The accounting for the planar density of atoms is the novelty of this work. Furthermore, the ultrasonic pulse-echo test is performed for the validation of the novelty assumptions.

scholarly journals Curvature Elastic Properties of Phosphatidylethanolamines with Mono-and Polyunsaturated Hydrocarbon Chains - An NMR and X-Ray Diffraction Study

2012 ◽  
Vol 102 (3) ◽  
pp. 413a
Author(s):  
Walter E. Teague ◽  
Olivier Soubias ◽  
Nola L. Fuller ◽  
R. Peter Rand ◽  
Klaus Gawrisch
Keyword(s):  
Diffraction Study ◽  
Elastic Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrocarbon Chains

Elastic properties ofGd5Si2Ge2studied with an ultrasonic pulse-echo technique

2006 ◽  
Vol 74 (18) ◽  
Author(s):  
O. Svitelskiy ◽  
A. Suslov ◽  
D. L. Schlagel ◽  
T. A. Lograsso ◽  
K. A. Gschneidner ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Ultrasonic Pulse ◽  
Pulse Echo

Effect of Ce3+ Ions Doped NiFe2O4 Magnetic Nanoparticles on Photocatalytic Degradation of Rhodamine B and Antibacterial Activities

2021 ◽  
Vol 21 (11) ◽  
pp. 5784-5793
Author(s):  
K. Geetha ◽  
R. Udhayakumar
Keyword(s):  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Spinel Ferrite ◽  
Magnetic Hysteresis ◽  
Aloe Vera ◽  
Antibacterial Activities ◽  
X Ray Diffraction ◽  
X Ray ◽  
E Coli ◽  
Ferrite Structure

In this study, spinel NiCexFe2–XO4 (x = 0.0 - 0.5) nanoparticles (NPs) was synthesized by microwave combustion technique (MCT) utilizing the fuel of Aloe vera plant extract. The establishment of spinel cubic crystal structure was ensured by powder X-ray diffraction (PXRD) technique. The particles like nanostructured morphology were confirmed by high-resolution scanning electron microscope (HRSEM). Energy dispersive X-ray (EDX) studies confirmed the formation of spinel ferrite structure and ensured that no other elements were present. Magnetic parameters such as remanant magnetisation (Mr), coercivity (He) and saturation magnetization (Ms) were calculated from the magnetic hysteresis (M-H) loops, which exhibited ferromagnetic behaviour. The photocatalytic behavior was investigated by visible light treatment for the photocatalytic degradation (PCD) of rhodamine B (Rh-B) dye and the sample NiCe0.3Fe1.7O4 exhibits higher PCD efficiency (93.88%) than other compositions. The antibacterial activities of gram-positive S. aureus, B. subtilis, gramnegative K. pneumonia and E. coli have been investigated using undoped and Ce3+ substituted NiFe2O4 NPs and observed higher activity, which indicated that, they can be used in the bio-medical applications.

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