Variation in structural and dielectric properties of co-precipitated nanoparticles strontium ferrites due to value of pH

Anis-ur-Rehman, M.; Asghar, Ghulam

doi:10.1016/j.jallcom.2010.09.050

Cited by 82 publications

(11 citation statements)

References 26 publications

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“…The slow motion of electrons in dielectric crystallite nanocomposites, interacting with iron ions through medium‐range forces will permanently be surrounded by a region of lattice polarization and deformation resulting from electron motion. As indicated in a recent paper 26, electrical conductivity in ferrites is essentially due to hopping of electrons between the same elemental ions.…”

Section: Resultsmentioning

confidence: 92%

Low‐temperature synthesis of single‐domain Sr‐hexaferrite particles by solid‐state reaction route

Sözeri

Baykal

Ünal

2012

Physica Status Solidi (a)

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Sr‐hexaferrite particles have been synthesized by conventional solid‐state reaction route at low temperatures by boron addition that is used as an inhibitor for crystal growth. The effect of boron concentration on the structural, magnetic and electrical properties of Sr‐hexaferrite particles are investigated by X‐ray crystallography, scanning electron microscopy, magnetization and conductivity measurements. Saturation magnetization of Sr‐hexaferrite increases up to 1 wt% boron addition, while coercivity becomes maximum with a boron amount of 2 wt%. Then, both magnetic parameters start to decrease with higher boron concentrations. Single‐domain and single‐phase powders have been obtained in the sample containing 1 wt% of boron that is sintered at 1050 °C. Impedance spectroscopies reveal that the dc conductivity increases tremendously with boron addition, while the ac conductivity increases with elevated temperature. The ac conductivity obeys roughly the power law of angular frequency in which tendencies change with temperature at low and medium temperature. Furthermore, higher contents of the dopant over approximately 2.0 wt% cause its temperature independency at higher frequencies. These are due to the grain size and secondary phase of hexaferrites that increases with the increase in boron amount.

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Section: Resultsmentioning

confidence: 92%

Low‐temperature synthesis of single‐domain Sr‐hexaferrite particles by solid‐state reaction route

Sözeri

Baykal

Ünal

2012

Physica Status Solidi (a)

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“…16,17 Figure 2 shows the X-ray diffraction pattern of strontium hexaferrite coatings which calcinated at three different temperatures, such as 600 C, 800 C, and 1000 C, under controlled atmosphere. The pattern shows well defined Bragg peaks at 600 C, 800 C, and 1000 C, which are significant of a good crystalline state of the samples.…”

Section: Resultsmentioning

confidence: 99%

EFFECT OF pH VALUE AND CALCINATION TEMPERATURE ON STRUCTURE AND MAGNETIC PROPERTIES OF STRONTIUM HEXAFERRITE THIN FILM

Shanaghi

2012

Surf. Rev. Lett.

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Strontium hexaferrite was widely used in the fabrication of commercial permanent magnets and certain microwave devices. In this study, the strontium hexaferrite nanoparticle coatings were prepared by solÀgel method and using spin coating process on silicon substrate, then the effect of pH value, such as 5, 7 and 9, and calcination temperatures, such as 600 C, 800 C, and 1000 C, on structural and magnetic properties of strontium hexaferrite thin films were investigated by XRD, SEM and VSM measurements. The maximum saturation magnetization value of 57.43 emu/g and coercivity value of 3908 Oe were achieved for the thin film with crystallite size approximately 41 nm, prepared at pH value of 7 and calcinations temperature of 800 C.

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“…Attempts to overcome these problems have led to the development of non-traditional methods, such as co-precipitation [11], sol–gel [12], hydrothermal [13], molten salt-assisted [14,15], and citrate precursor [16,17,18]. Among these methods, the sol–gel and citrate precursor methods enable raw materials to be mixed on the ionic level and subsequent crystallization at low temperature, resulting in the production of uniform nano-SrFe 12 O 19 [12,19].…”

Section: Introductionmentioning

confidence: 99%

Controlling the Composition and Magnetic Properties of Nano-SrFe12O19 Powder Synthesized from Oily Cold Mill Sludge by the Citrate Precursor Method

et al. 2019

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This paper proposes a new method for producing nano-SrFe12O19 powder by the citrate precursor route using solid waste as a source of iron. This solid iron-containing waste, which exists in the form of an oily sludge, is produced by a cold rolling mill. This sludge was first subjected to a process, including sulfuric acid leaching, oxidation, precipitation, and nitric acid leaching, to obtain an iron nitrate (Fe(NO3)3) solution. Next, the Fe(NO3)3 solution was mixed with a strontium nitrate (Sr(NO3)2) solution obtained by subjecting strontium carbonate to nitric acid leaching. Subsequently, citric acid, as chelating agent, and ammonia water, as precipitating agent, were added to the mixed solution to form a gel. The gel was dried and spontaneously combusted, then annealed at different temperatures for 2 h in flowing air. The effects of the Fe3+/Sr2+ molar ratio and annealing temperature on the formation, morphology, and magnetic properties of SrFe12O19 were investigated. The results showed that single-phase SrFe12O19 powder was obtained by decreasing the Fe3+/Sr2+ molar ratio from the stoichiometric value of 12 to 11.6 and increasing the annealing temperature to 1000 °C for 2 h. Adjustment of the Fe/Sr molar ratio to 12 and the annealing temperature to 900 °C enabled the magnetic properties to be optimized, including saturation magnetization (Ms) 80.2 emu/g, remanence magnetization (Mr) 39.8 emu/g, and coercive force (Hc) 6318 Oe.

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Variation in structural and dielectric properties of co-precipitated nanoparticles strontium ferrites due to value of pH

Cited by 82 publications

References 26 publications

Low‐temperature synthesis of single‐domain Sr‐hexaferrite particles by solid‐state reaction route

Low‐temperature synthesis of single‐domain Sr‐hexaferrite particles by solid‐state reaction route

EFFECT OF pH VALUE AND CALCINATION TEMPERATURE ON STRUCTURE AND MAGNETIC PROPERTIES OF STRONTIUM HEXAFERRITE THIN FILM

Controlling the Composition and Magnetic Properties of Nano-SrFe12O19 Powder Synthesized from Oily Cold Mill Sludge by the Citrate Precursor Method

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