Humidity sensor applicative material based on copper-zinc-tungsten spinel ferrite

Petrila, Iulian; Tudorache, Florin

doi:10.1016/j.matlet.2013.06.066

Cited by 48 publications

(13 citation statements)

References 23 publications

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“…As opposed to magnetic properties, the electrical ones vary significantly with each additional heat treatment. The first noticeable change regarding electric properties is in relation to the frequency of the electric field applied, that is the electrical permittivity and conductivity present maximum values at lower frequencies as a typical Maxwell‐Wagner‐Debye relaxation . As for overall changes in relation to temperature the behavior is similar with the magnetic one, with maximum values centered for the 0.4 cobalt content formulation but significantly dropping after the second and third heat treatment (500°C→900°C).…”

Section: Resultsmentioning

confidence: 90%

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

Vîrlan

Tudorache

Pui

2017

Int J Applied Ceramic Tech

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The study presents the effects of different calcination temperatures on the size and morphology of mixed Co‐Ni ferrites, and the respective changes in the magnetic and electrical properties, with emphasis on their applicability as humidity sensors. The data suggests that the heat treatment does not significantly change the magnetic properties, but significant variations on the morphology of the nanoparticles, correlated with large changes in the electrical properties of the nanoparticles in terms of electrical permittivity and resistivity with electrical field frequency and humidity, with a clear influence of the calcination temperature over the sensibility of the materials to humidity.

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Section: Resultsmentioning

confidence: 90%

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

Vîrlan

Tudorache

Pui

2017

Int J Applied Ceramic Tech

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“…These properties depend on various factors like, ionic radii, nature of hybridization, presence of doped atom in host lattice apart from the particle size [7][8][9][10]. Thus, research is being carried out for doped ferrite systems in order to understand the altered behavior and to optimize them for different applications [11][12][13][14][15]. In recent years, rare earth (RE) doped ferrites become interesting due to their superiority for various applications over other doped ferrite systems [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, these ferrites cover a wide range of applications chiefly based on their magnetic characteristics [17][18][19][20][21][22][23][24][25]. However, there is lack of understanding of magnetic interaction, conduction mechanism inside these ferrites [15,16]. Thus purpose of this review article is to discuss these issues and to give prospects for future research in this direction.…”

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confidence: 99%

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Singh¹,

Kumar²,

Srivastava³

et al. 2016

Appl. Sci. Lett.

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In present review we have focused various issues like solubility limit, magnetic interaction and conduction mechanism of rare earth doped ferrite. Cumulative effects of valence state, magnetic moments of rare earth ions, weakening/strengthening of exchange interaction and magnetic ordering in rare earth ion doped ferrite are responsible for magnetic behavior. It is proposed that characterization techniques based on synchrotron radiation like X-ray absorption spectroscopy and X-ray magnetic circular dichroism can open pathways to prove these assumptions.Keywords: Rare earth, ferrites, magnetic interaction, valence state 1.INTRODUCTIONSpinel ferrites are ferrimagnetic material which have numerous technological applications [1][2][3]. Moreover, nanoparticles of these ferrites are being utilized in high-density magnetic information storage, magnetic resonance imaging, drug delivery etc. [4][5][6]. These several applications are based on magnetic and electrical behavior of ferrites [1][2][3][4][5][6]. These properties depend on various factors like, ionic radii, nature of hybridization, presence of doped atom in host lattice apart from the particle size [7][8][9][10]. Thus, research is being carried out for doped ferrite systems in order to understand the altered behavior and to optimize them for different applications [11][12][13][14][15]. In recent years, rare earth (RE) doped ferrites become interesting due to their superiority for various applications over other doped ferrite systems [17][18][19][20][21][22]. These systems become radioactive and exhibit potentential for biomedical applications [19] along-with efficient tumor passive targeting [23]. Improved capability of dye removal [24], waste water treatment [25], degradation of organic pollutants through photocatalytic activity [26] are other important fields of utilization of these ferrites. These ferrites exhibit enhanced magneto optical kerr (MOKE) effect [20] and excellent microwave absorption properties [21,22]. Thus, these ferrites cover a wide range of applications chiefly based on their magnetic characteristics [17][18][19][20][21][22][23][24][25]. However, there is lack of understanding of magnetic interaction, conduction mechanism inside these ferrites [15,16]. Thus purpose of this review article is to discuss these issues and to give prospects for future research in this direction. SPINEL FERRITEThe general formula for spinel ferrite is MO:Fe2O3 where, M is a divalent transition metal ion. Spinel name is given due to resemblance of structure of these ferrites with mineral spinel MgO.Al2O3. In this structure, oxygen ions are packed quite close together in face centred cubic arrangement and metal ions occupy spaces between them (Fig. 1). These spaces are categorized as tetrahedral (A) and octahedral (B) sites when surrounded by four and six oxygen ions respectively (Fig. 1).In a unit cell of spinel ferrite, there exists 64 and 32 A and B-sites respectively. Only 1/8 th and 1/2 th of A and B-sites are occupied [27]. Metal ions are distributed among A a...

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“…The reliability tests did not show significant differences between light rare earths zirconates sensors. Comparatively with other materials [44][45][46], humidity sensors based on light rare earths zirconates show high sensitivity, medium response and recovery times, but have in compensation the advantage of high physical and chemical stability.…”

Section: Electrical and Humidity Sensing Propertiesmentioning

confidence: 99%

Microstructure, electrical and humidity sensing properties of light rare earths zirconates

Petrila

Popa

Tudorache

2016

Sensors and Actuators A: Physical

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Humidity sensor applicative material based on copper-zinc-tungsten spinel ferrite

Cited by 48 publications

References 23 publications

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Microstructure, electrical and humidity sensing properties of light rare earths zirconates

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