Magnetic and dielectric properties of Zn substituted cobalt oxide nanoparticles

Duvuru, Hima Bindu; Alla, S.K.; Shaw, S.K.; Meena, Sher Singh; Gupta, Nandini; Prasad, B. G.; Kothawale, Manoj M.; Kumar, Mahesh; Prasad, N.K.

doi:10.1016/j.ceramint.2019.05.185

Cited by 36 publications

(5 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(ii) Co 2+ ions can be easily transformed into Co 3+ ions (iii) Fe 3+ ions showing strong capability to get converted into Fe 2+ after gaining of an electron. Thus, this is a well-established behaviour presented by cobalt and iron ions, already reported in literature [ 62 , 79 , 80 ].…”

Section: Resultssupporting

confidence: 80%

“…Bindu et al, previously reported that redistribution of Zn 2+ ions among both sites (tetrahedral and octahedral) was confirmed by Rietveld analysis for high Zn 2+ concentration. Such phenomenon occurred due to creation of localized anti ferromagnetic interaction between the ions, which ultimately results in reduction of net magnetization samples [ 62 , 63 ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

et al. 2023

View full text Add to dashboard Cite

The vast applicability of spinel cobalt ferrite due to its unique characteristics implies the need for further exploration of its properties. In this regard, structural modification at the O-site of spinel with Li1+/Zn2+ was studied in detail for exploration of the correlation between structural, magnetic, and dielectric properties of the doped derivatives. The CTAB-assisted coprecipitation method was adopted for the synthesis of the desired compositions owing to its cost effectiveness and size controlling ability. Redistribution of cations at T- and O-sites resulted in the expansion of the crystal lattice, but no distortion of the cubic structure was observed, which further supports the flexible crystal structure of spinel for accommodating larger Li1+/Zn2+ cations. Moreover, an XPS analysis confirmed the co-existence of the most stable oxidation states of Zn2+, Li1+, Co2+, and Fe3+ ions with unstable Co3+ and Fe2+ ions as well, which induces the probability of hopping mechanisms to a certain extent and is a well-established behavior of cobalt ferrite nanoparticles. The experimental results showed that Li1+/Zn2+ co-doped samples exhibit the best magnetic properties at dopant concentration x = 0.3. However, increasing the dopant content causes disturbance at both sites, resulting in decreasing magnetic parameters. It is quite evident from the results that dielectric parameters are closely associated with each other. Therefore, dopant content at x = 0.1 is considered the threshold value exhibiting the highest dielectric parameters, whereas any further increase would result in decreasing the dielectric parameters. The reduced dielectric properties and enhanced magnetic properties make the investigated samples a potential candidate for magnetic recording devices.

show abstract

Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

et al. 2023

View full text Add to dashboard Cite

show abstract

“…28 Herein, Co 3+ ions at octahedral sites play a role as active sites for electrochemical oxidation processes of the OH − functional group within 1-naphthol. Prasad et al 54 reported that Zn ions in spinel structure Zn x Co 3−x O 4 play an important role in its electric property. Thus, increasing Zn ions at tetrahedral sites may give rise to the increase in conductivity of ZCO-NFs crystalline, resulting in the improvement of electron transfer rate.…”

Section: Sensitive Detection Of Cbrmentioning

confidence: 99%

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

et al. 2023

View full text Add to dashboard Cite

The recent advancement in designing novel spinel nanostructures has opened virtually infinite possibilities for the development of high-performance electrochemical sensors to detect target species. The electrocatalytic activity of spinel structures can be enhanced by tuning the cation distribution; however, the role of cation distribution at tetrahedral ions on the electrochemical sensing responses has rarely been considered. Herein, the effect of cation distribution at tetrahedral sites (T d ) in the spinel nanostructure ZnCo 2 O 4 on the electrochemical sensing performance toward carbaryl (CBR) was first investigated. The ZnCo 2 O 4 nanoflake samples with different cation ratios of Zn/Co at tetrahedral sites were designed by using a facile solvothermal method. We found that a higher Zn ion content at tetrahedral sites significantly enhanced the electron transfer ability through the electrolyte/electrode interface. More interestingly, a higher Co ion ratio between octahedral sites and tetrahedral (Co Oh /Co Td ) promoted the electrochemical oxidation process of CBR with a higher catalytic rate constant (k cat ). Under optimized conditions, the ZnCo 2 O 4 -NF-based electrochemical nanosensor showed a linear response from 0.15 to 100 μM with a limit of detection of 0.05 μM and a high electrochemical sensitivity of 2.04 μA μM −1 cm −2 . The designed nanosensor also exhibited good repeatability, long-time stability, high anti-interference ability, and excellent recovery with fruit and vegetable samples. Furthermore, this study offers insights into the cation distribution-dependent electrocatalytic activities of spinel nanostructures, which is helpful to the design of advanced spinel nanostructure-based electrocatalysts for improving the electrochemical sensing performance.

show abstract

“…The intraparticle diffusion rate constant K i is higher for Pb(II) followed by Zn(II) and Cd(II) ions (see Table 2) which can be related to their respective ionic radius. The ionic radii are: Pb(II) 0.119 nm [32] > Cd(II) 0.095 nm [33] > Zn(II) 0.074 nm [34], therefore, the Pb(II) saturated the surface of sorbent faster than Cd(II) or Zn(II) ions. A low coefficient of determination (R 2 < 0.77) does not suggest a significant relationship between q and t 0.5 for the adsorption of Cd(II) and Pb(II) ions onto the biochar.…”

Section: Sorption Kineticsmentioning

confidence: 98%

Biochar from Maize Hybrid Fermentation Residuelow Cost and Efficient Heavy Metals Sorbent

Tokarčíková

Seidlerová

Motyka

et al. 2019

Ecological Chemistry and Engineering S

View full text Add to dashboard Cite

Biochar produced from fermentation residue of maize hybrid was used in untreated form as a sorbent for the removal of Cd(II), Pb(II) and Zn(II) from aqueous solution. The capability of biochar to immobilized ions was investigated by leaching test. Equilibrium between biochar sample and studied elements in solution was reached at a contact time 30 min for Zn(II) and 90 min for Pb(II) and Cd(II). The experimental data were described by pseudofirst-order and pseudo-second-order kinetic model, two- and three-parameter isotherms in non-linear form. The maximum sorption capacity achieved was 30.07 mg·g−1 in the case of Cd(II) ions, 99.44 mg·g−1 in the case of Pb(II) and 40.18 in the case of Zn(II). Biochar developed for this study is comparable to conventional biochar, low cost, non-toxic and experimental results show that is a suitable and efficient sorbent for Cd(II), Pb(II) and Zn(II) removal from aqueous solutions.

show abstract

Magnetic and dielectric properties of Zn substituted cobalt oxide nanoparticles

Cited by 36 publications

References 43 publications

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Biochar from Maize Hybrid Fermentation Residuelow Cost and Efficient Heavy Metals Sorbent

Contact Info

Product

Resources

About

Magnetic and dielectric properties of Zn substituted cobalt oxide nanoparticles

Cited by 36 publications

References 43 publications

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo2O4 Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Biochar from Maize Hybrid Fermentation Residuelow Cost and Efficient Heavy Metals Sorbent

Contact Info

Product

Resources

About

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples