Structural, Thermal and Dielectric Properties of Lithium Zinc Silicate Ceramic Powders by Sol-Gel Method

Babu, B. Chandra; Naresh, V.; Prakash, Braham; Buddhudu, S.

doi:10.1080/07315171.2011.623610

Cited by 40 publications

(17 citation statements)

References 31 publications

(27 reference statements)

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“…Hz and there is a decreasing trend in value with increasing frequency from 1000 Hz to 2 MHz which is a normal behavior of ferromagnetic materials. The decrease in ε' is sharp initially from 20 Hz to 1000 Hz (lower frequency) and then ε' value decreases slowly with the increase in frequency and showed almost frequency independent behavior at high frequency regions [12]. Similar behavior was observed in our publications on Mg-Zn Ferrites (Ravinder and Latha, 1999), Li-Cd ferrites (Radha and Ravinder, 1995).…”

Section: Structural Characterizationsupporting

confidence: 72%

Influence of Cr<sup>3+</sup> Ion on the Dielectric Properties of Nano Crystalline Mg-Ferrites Synthesized by Citrate-Gel Method

Raghasudha¹,

Ravinder²,

Veerasomaiah³

2013

MSA

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Mixed Mg-Cr Nano ferrites having the compositional formula MgCr x Fe 2−x O 4 (where x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0) were synthesized using Citrate-Gel auto combustion method. Structural characterization was carried out by XRD Analysis which confirmed the formation of single phase cubic spinel structure without any impurity peak. The dielectric properties such as Dielectric constant (ε'), Dielectric Loss tangent (tan δ) and AC conductivity (σ AC ) of Mg-Cr nano ferrites were studied at room temperature in the frequency range of 2 Hz -2 MHz using Agilent E4980A Precision LCR meter. The dielectric constant, loss tangent and AC conductivity shows a normal behavior with frequency. A qulitative explanation is given for composition and frequency dependance of the dielectric constant, dielectric loss tangent and AC conductivity of the nano ferrite. The loss tangent for the synthesized samples was found to be decreased from 0.09 to 0.054 in higher frequency region showing the potential applications of these materials in high frequency micro wave devices. On the basis of these results the explanation of dielectric mechanism in Mg-Cr ferrites is suggested.

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Section: Structural Characterizationsupporting

confidence: 72%

Influence of Cr<sup>3+</sup> Ion on the Dielectric Properties of Nano Crystalline Mg-Ferrites Synthesized by Citrate-Gel Method

Raghasudha¹,

Ravinder²,

Veerasomaiah³

2013

MSA

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“…Absorption peaks present at 620 and 700 cm −1 ascribed to the ZnO 4 asymmetric stretching and SiO torsional vibrations whereas peaks at 812 and 884 cm −1 were assigned to the SiO 4 symmetric stretching vibration [21,38,41,42,45,46]. The absorption peak around 989 cm −1 was assigned to the SiO 4 asymmetric stretching vibration [15,45,47]. The existence of the vibrations of SiO 4 and ZnO 4 groups being evidence of the formation of the Zn 2 SiO 4 phase [47][48][49].…”

Section: Fourier Transform Infrared (Ft-ir) Spectroscopymentioning

confidence: 99%

“…The absorption peak around 989 cm −1 was assigned to the SiO 4 asymmetric stretching vibration [15,45,47]. The existence of the vibrations of SiO 4 and ZnO 4 groups being evidence of the formation of the Zn 2 SiO 4 phase [47][48][49]. The vibrational band observed at 1110 cm −1 ascribed to the Si-O-Si asymmetric stretching vibrations [15,20].…”

Section: Fourier Transform Infrared (Ft-ir) Spectroscopymentioning

confidence: 99%

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

et al. 2021

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This research paper proposes the usage of a simple thermal treatment method to synthesis the pure and Eu3+ doped ZnO/Zn2SiO4 based composites which undergo calcination process at different temperatures. The effect of calcination temperatures on the structural, morphological, and optical properties of ZnO/Zn2SiO4 based composites have been studied. The XRD analysis shows the existence of two major phases which are ZnO and Zn2SiO4 crystals and supported by the finding in the FT-IR. The FESEM micrograph further confirms the existence of both ZnO and Zn2SiO4 crystal phases, with progress in the calcination temperature around 700–800 °C which affects the existence of the necking-like shape particle. Absorption humps discovered through UV-Vis spectroscopy revealed that at the higher calcination temperature effects for higher absorption intensity while absorption bands can be seen at below 400 nm with dropping of absorption bands at 370–375 nm. Two types of band gap can be seen from the energy band gap analysis which occurs from ZnO crystal and Zn2SiO4 crystal progress. It is also discovered that for Eu3+ doped ZnO/Zn2SiO4 composites, the Zn2SiO4 crystal (5.11–4.71 eV) has a higher band gap compared to the ZnO crystal (3.271–4.07 eV). While, for the photoluminescence study, excited at 400 nm, the emission spectra of Eu3+ doped ZnO/Zn2SiO4 revealed higher emission intensity compared to pure ZnO/Zn2SiO4 with higher calcination temperature exhibit higher emission intensity at 615 nm with 700 °C being the optimum temperature. The emission spectra also show that the calcination temperature contributed to enhancing the emission intensity.

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“…Band positions and their assignments were identified according to major spectra structure correlations by spectral regions. Bands at 458 cm À1 were assigned to inorganic silicates Si-O asymmetric deformation vibration (Babu et al, 2011;Colthup et al, 1990). Si species present in biomass undergo changes during pyrolysis, where some of the Si species would transform into quartz, dehydroxylated silicates or alkali silicates (Qian et al, 2016).…”

Section: Nature Of Sorption Interactionsmentioning

confidence: 99%

The relationship between properties of plant-based biochars and sorption of Cd(II), Pb(II) and Zn(II) in soil model systems

Soria

Rolfe

Betancourth

et al. 2020

Heliyon

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Plant based biochars are proposed as soil amendments to immobilize potentially toxic trace elements (PTEs), such as Cd(II), Pb(II) and Zn(II) and aid in soil restoration. However, the sorption capacity of biochar for these elements can vary widely depending on biochar nature and metal properties. Currently, there is no clear methodology to pre-screen biochars for their suitability as adsorbents for these elements. Therefore, to facilitate biochar selection for application in soil restoration, this study explored the relationships between the physico-chemical properties of five plant-based biochars and their capacity to immobilize Cd(II), Pb(II) and Zn(II). Batch experiments using synthetic soil pore water were used to assess the sorption of these elements. The sorption isotherms described by the Hill model indicated that PTE sorption capacity followed the order Pb(II) > Cd(II) >Zn(II) regardless of biochar type in mono-element systems. Preferential sorption of Pb(II) limited the immobilization of Cd(II) and Zn(II) in multi-element systems. ATR-FTIR and SEM-EDX spectroscopy studies indicated that Cd(II) and Pb(II) sorption was mediated by complexation with carboxylic groups, cation-π interactions and precipitation with phosphates and silicates, while Zn(II) sorption occurred mainly by complexation with phenolic groups and precipitation with phosphates. A high correlation (>0.8) between Electrical Conductivity, Cation Exchange Capacity, pH and sorption capacity was identified for all metals tested, highlighting the electrostatic nature of the sorption mechanisms involved. Biochars derived from herbaceous feedstock were better candidates for remediation of soil polluted with Cd(II), Pb(II) and Zn(II), rather than wood-derived biochar. Overall, this study provides evidence of the direct relationship between specific properties of plant-based biochars (pH and EC) and their suitability as adsorbents for some PTEs in soil systems.

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Structural, Thermal and Dielectric Properties of Lithium Zinc Silicate Ceramic Powders by Sol-Gel Method

Cited by 40 publications

References 31 publications

Influence of Cr<sup>3+</sup> Ion on the Dielectric Properties of Nano Crystalline Mg-Ferrites Synthesized by Citrate-Gel Method

Influence of Cr<sup>3+</sup> Ion on the Dielectric Properties of Nano Crystalline Mg-Ferrites Synthesized by Citrate-Gel Method

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

The relationship between properties of plant-based biochars and sorption of Cd(II), Pb(II) and Zn(II) in soil model systems

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Structural, Thermal and Dielectric Properties of Lithium Zinc Silicate Ceramic Powders by Sol-Gel Method

Cited by 40 publications

References 31 publications

Influence of Cr&lt;sup&gt;3+&lt;/sup&gt; Ion on the Dielectric Properties of Nano Crystalline Mg-Ferrites Synthesized by Citrate-Gel Method

Influence of Cr&lt;sup&gt;3+&lt;/sup&gt; Ion on the Dielectric Properties of Nano Crystalline Mg-Ferrites Synthesized by Citrate-Gel Method

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

The relationship between properties of plant-based biochars and sorption of Cd(II), Pb(II) and Zn(II) in soil model systems

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Influence of Cr<sup>3+</sup> Ion on the Dielectric Properties of Nano Crystalline Mg-Ferrites Synthesized by Citrate-Gel Method

Influence of Cr<sup>3+</sup> Ion on the Dielectric Properties of Nano Crystalline Mg-Ferrites Synthesized by Citrate-Gel Method