Dissolution behavior of synthetic Mg/Zn-ferrite corrosion products in EDTA and NTA based formulations

Keny, S.J.; Manjanna, J.; Venkateswaran, G.; Kameswaran, R.

doi:10.1016/j.corsci.2005.10.006

Cited by 20 publications

(10 citation statements)

References 13 publications

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“…The FTIR spectroscopy data can be used to determine the stiffness constant, elastic constants and Debye temperature etc [65,66]. The equations used to calculate C 11 is given by [67] = C K a, av 11 where K av is the average of tetrahedral and octahedral force constant calculated (table 2) from FTIR spectra using the following equation [68]: The obtained values of C ij (table 3) confirmed that the ferrites compositions under consideration satisfy the Born criteria for mechanical stability [70,71]:…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Ali

Khan

Hossain

et al. 2020

Mater. Res. Express

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We report the synthesis of Y-substituted Mg-Zn [Mg 0.5 Zn 0.5 Y x Fe 2−x O 4 (0x0.05)] ferrites using conventional standard ceramic technique. The samples were characterized by x-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), FTIR spectroscopy, UV-Vis spectroscopy and quantum design physical properties measurement system (PPMS). XRD patterns confirm the single phase cubic spinel structure up to x=0.03 and appearance of a secondary phase of YFeO 3 for higher Y contents. FESEM images depict the distribution of grains and EDS spectra confirmed the absence of any unwanted element. Completion of solid state reaction and formation of spinel structure has been revealed from FTIR spectra. The FTIR data along with lattice constant, bulk density and porosity were further used to calculate the stiffness constant (C ij ), elastic constant and Debye temperatures. Mechanical stability of all studied compositions is confirmed from C ij using Born stability conditions. Brittleness and isotropic nature are also confirmed using Poisson's ratio and anisotropy constants, respectively. The enhancement of dc electrical resistivity (10 5 Ω cm to 10 6 Ω cm) with Y content is observed. The energy band gap (increased with Y contents) is found in good agreement with dc electrical resistivity. Ferrimagnetic to paramagnetic phase change has been observed from the field dependent high temperature magnetization curves. The magnetic moments and saturation magnetization were found to be decreased with increasing temperature. The Curie temperature (T c ) has been measured from temperature dependent magnetic moment (M-T) and initial permeability (μ′ i -T) measurements and found to be in good agreement with each other. Decrease in T c with Y content is due to redistribution of cations and weakening of the exchange coupling constant. The magnetic phase transition has been analyzed by Arrott plot and found to have second order phase transition. The dc resistivity endorses the prepared ferrites are suitable for high frequency and high temperature magnetic device applications as well.Mg-Zn ferrite is one of the most used soft ferrites because of its high electrical resistivity, low cost, low dielectric loss, high mechanical hardness and superior environmental stability [13]. Mg-Zn ferrites with higher resistivity (10 6 -10 7 Ω cm) make its suitability in high frequency applications [13]. Most of (∼ 90%) Mg 2+ ions are located on the B-sites and small fraction (∼10%) occupies in the A-sites [14,15]. However, the Zn 2+ ions have a preference to occupy A-sites in the spinel lattice [16,17]. The Fe 3+ ions are distributed on both A-and B-sites [18]. Therefore, the physical properties of the Mg-Zn ferrites are determined by the cations distribution over the A-and B-sites. The physical properties can be altered by introducing the different metallic ions results the cations distribution modification on the A-and B-sites. The factors that determine cation distributions are ionic radius, charge, site preference and le...

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Section: Mechanical Propertiesmentioning

confidence: 99%

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Ali

Khan

Hossain

et al. 2020

Mater. Res. Express

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show abstract

“…The force constants (F C ), which depend on the vibrational frequencies at A and B-sites, are F CT and F CO , respectively, as calculated by equation [22]…”

Section: Ftir Analysismentioning

confidence: 99%

“…where υ is the vibrational frequency, C is the speed of light in a vacuum, and m is the reduced mass of the metal and oxygen system, Fe 3+ and O 2ions which is equivalent to 2.061 × 10 −23 g. As shown in Table 2, the force constant at the tetrahedral site is greater than that at the octahedral sites, and Zn 2+ substitution in MgFe 2 O 4 has led to a decrease in the force constant at the tetrahedral site, indicating that Zn 2+ ions occupy the tetrahedral positions [19,22].…”

Section: Ftir Analysismentioning

confidence: 99%

Structural, optical, room-temperature and low-temperature magnetic properties of Mg–Zn nanoferrite ceramics

Kumar

Ahmad

Lincoln

et al. 2019

Journal of Asian Ceramic Societies

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Mg-Zn nanocrystalline ferrites (Mg 1−x Zn x Fe 2 O 4 , where x = 0.0 to 1.0) were synthesized by the citrate gel auto-combustion route. XRD revealed the formation of nano-sized particles with cubic spinel structure. Lattice constant and specific surface area increased with Zn substitution. SEM micrographs revealed inhomogeneous grains with agglomerates; EDS spectra confirmed the stoichiometry. HRTEM images showed agglomerated nanoparticles with average particle sizes of 21 nm and 16 nm for x = 0.6 and 1.0, respectively, and lattice fringe images and SAED patterns showed nanocrystalline characteristics corroborating the XRD results. FTIR and Raman spectra recorded at room temperature confirmed the spinel structure of ferrites. VSM technique at room temperature used to measure magnetic properties. M S and H C were found to decrease with increases in the Zn concentration in Mg-Zn ferrites due to a weakening of the A-B interaction and decrease in the particle size and surface effect. Low-temperature magnetic studies were carried out in the ZFC and FC modes using SQUIDS by applying 100 Oe between temperatures of 5 and 400 K, and magnetic isotherms were recorded at temperatures of 51 and 310 K. The study revealed the superparamagnetic nature of the synthesized samples showing that the blocking temperature (T B ) depends on interparticle interactions.

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“…This discrepancy can be related to the lower volume/mass ratio (V/m(Diffusion-cell)~17.7 L kg -1 ) compared to the ratio used in this study (V/m(Large-scale)~4 10 -3 L kg -1 ). Kinetics of dissolution processes were already studied on various mineral phases: for example, on iron oxides (Noren et al, 2009) and hydroxides (Nowack and Sigg, 1997), calcite and magnesite (Pokrovsky et al, 2009), Mg-Zn-Ferrite (Keny et al, 2006). It is noteworthy for simulations at longer time scale that the release of iron in solution under Fe-EDTA form could also catalyze the degradation of EDTA which is usually stable in solution in absence of heat, bacterial activity or radiation (Means et al, 1980;Metsärinne et al, 2001).…”

Section: Transport and Behaviour Of Edtamentioning

confidence: 98%

Perturbation induced by EDTA on HDO, Br- and EuIII diffusion in a large-scale clay rock sample

Dagnelie

Arnoux

Radwan

et al. 2015

Applied Clay Science

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Dissolution behavior of synthetic Mg/Zn-ferrite corrosion products in EDTA and NTA based formulations

Cited by 20 publications

References 13 publications

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Structural, optical, room-temperature and low-temperature magnetic properties of Mg–Zn nanoferrite ceramics

Perturbation induced by EDTA on HDO, Br- and EuIII diffusion in a large-scale clay rock sample

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