Role of Cr3+ ions on the microstructure development, and magnetic phase evolution of Ni0.7Zn0.3Fe2O4 ferrite nanoparticles

Birajdar, A. A.; Shirsath, Sagar E.; Kadam, R.H.; Patange, S.M.; Lohar, K.S.; Mane, D.R.; Shitre, A. R.

doi:10.1016/j.jallcom.2011.09.087

Cited by 35 publications

(6 citation statements)

References 44 publications

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“…The results demonstrate that Co 2 þ and Ni 2 þ and Cr 3 þ ions distributed over tetrahedral A and octahedral B-site but shows preference toward the B sites. Cr 3 þ preferentially replaces Fe 3 þ from octahedral sites because of their favorable crystal field effects (Cr 3 þ 6/5D 0 , Cr 3 þ 0D 0 ) [23]. Further, Cr 3 þ ions predominately occupy the octahedral sites, which is consistent with the preference for large octahedral site energy.…”

Section: Cation Distributionsupporting

confidence: 59%

Fabrication of Co0.5Ni0.5CrxFe2−xO4 materials via sol–gel method and their characterizations

Kadam¹,

Birajdar²,

Alone

et al. 2013

Journal of Magnetism and Magnetic Materials

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Section: Cation Distributionsupporting

confidence: 59%

Fabrication of Co0.5Ni0.5CrxFe2−xO4 materials via sol–gel method and their characterizations

Kadam¹,

Birajdar²,

Alone

et al. 2013

Journal of Magnetism and Magnetic Materials

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“…Zn-Co based ferrite nanoparticles are attractive for magnetic hyperthermia due to their favorable magnetic and chemical properties [27], due to their low coercivity and remanence value, which allows the nanoparticles to be easily magnetized and demagnetized under the influence of an external magnetic field. Moreover, the ionic radius of Cr 3+ is quite similar to that of Fe 3+ , so they can be replaced without destroying the integrity and symmetry of the original crystalline structure [28,29]. Furthermore, adding Cr 3+ to the Zn-Co-based ferrite structure decreases its T C , giving these nanoparticles the possibility of self-regulation closes to the treatment temperature [30].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cr³⁺ doped Zn-Co nanoferrites as potential candidate for self-regulated magnetic hyperthermia applications

Valente-Rodrigues¹,

Caraballo-Vivas²,

Santos³

et al. 2023

Phys. Scr.

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Controlling the Curie temperature (TC) in the range from 42-46 °C in magnetic hyperthermia (MH) therapy is an essential research topic because overheating can cause irreversible damage to healthy tissue. When TC is in the above temperature range, the magnetic nanoparticles reach a paramagnetic state, effectively turning off the MH treatment. In this work, we synthesized Zn-Co nanoparticles of representative composition Zn0.54Co0.46CrxFe2-xO4, where the Fe3+ cations are carefully replaced by Cr3+ ions, which allow a precise tuning of TC and hence the self-regulation of MH. The X-ray diffraction analysis of the prepared nanoparticles confirms the formation of a single-phase cubic spinel structure. The average crystallite of the nanoparticles increases with Cr3+ doping, while the TC and saturation magnetization decrease considerably from 78 °C (x = 1) to 27 °C (x = 0.6) and 46.6 emu/g (x = 1) to 15.3 emu/g (x = 0.6), respectively. Besides MH potential of the investigated samples as revealed from specific absorption rate (SAR) assays and the maximum temperature reach (Tmax), vary from 7 W/g and 37.3 °C, for x = 0.6, to 38 W/g and 62.9 °C, for x = 0.1, we found that the composition Zn0.54Co0.46Cr0.4Fe1.6O4 is more promising with SAR of 22 W/g and Tmax = 42.3 °C, which is precisely lies in the safe temperature range to automatically activate the self-regulation during the magnetic hyperthermia treatment. The results reveal an excellent combination between size distribution and Cr3+ content in Zn-Co-based ferrite, which has a great potential for self-regulated magnetic hyperthermia applications.

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“…In our previous work, we found that substituting Fe 3+ by nonmagnetic Cr 3+ in the spinel ferrite nanoparticles can decrease the Curie temperature and increase H c simultaneously, which is attributed to the effect of Cr 3+ on the spinel structure of ferrite in the formation process of nanoparticles. [21][22][23] In addition, the analogous valence-bond structure and similar radius of Fe 3+ and Cr 3+ makes their amorphous hydroxide precipitates behave thermodynamically to true solid solutions and consequently the Cr 3+ may be substituted into Co-Zn ferrite without breaking its spinel lattice structure and symmetry. 24 44.0 o C) and its specific absorption rate (SAR) is 774 W kg -1 which is two folds higher than the SAR standard for magnetic nanoparticles used in hyperthermia, 25 under magnetic field with the frequency and intensity at 100 kHz and 200 Oe.…”

Section: Introductionmentioning

confidence: 99%

Novel nanoparticles with Cr³⁺ substituted ferrite for self-regulating temperature hyperthermia

et al. 2017

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For hyperthermia to be used under clinical conditions for cancer therapeutics the temperature regulation needs to be precise and accurately controllable. In the case of the metal nanoparticles used for such activities, a high coercivity is a prerequisite in order to couple more energy in a single heating cycle for efficient and faster differential heating. The chemically stable Co-Zn ferrite nanoparticles have typically not been used in such self-regulating hyperthermia temperature applications to date due to their low Curie temperature usually accompanied by a poor coercivity. The latter physical property limitation under clinically applied magnetic field conditions (frequency: 100 kHz, intensity: 200 Oe) restricts the transfer of a reasonable heat energy, and thus limits the hyperthermia efficiency. Here, we report a novel Cr substituted Co-Zn ferrite (ZnCoCrFeO), whose Curie temperature and coercivity values are 45.7 °C and 174 Oe, respectively. Under clinically acceptable magnetic field conditions, the temperature of these nanoparticle suspensions can be self-regulated to 44.0 °C and, most importantly with a specific absorption rate (SAR) of 774 W kg, which is two-fold higher than the SAR standard for magnetic nanoparticles used in hyperthermia (300 W kg). The evaluation of the in vitro cytotoxicity of the nanoparticles reports a low toxicity, which points to a novel set of magnetic nanoparticles for use in self-regulating hyperthermia.

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Role of Cr3+ ions on the microstructure development, and magnetic phase evolution of Ni0.7Zn0.3Fe2O4 ferrite nanoparticles

Cited by 35 publications

References 44 publications

Fabrication of Co0.5Ni0.5CrxFe2−xO4 materials via sol–gel method and their characterizations

Fabrication of Co0.5Ni0.5CrxFe2−xO4 materials via sol–gel method and their characterizations

Investigation of Cr³⁺ doped Zn-Co nanoferrites as potential candidate for self-regulated magnetic hyperthermia applications

Novel nanoparticles with Cr³⁺ substituted ferrite for self-regulating temperature hyperthermia

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Role of Cr3+ ions on the microstructure development, and magnetic phase evolution of Ni0.7Zn0.3Fe2O4 ferrite nanoparticles

Cited by 35 publications

References 44 publications

Fabrication of Co0.5Ni0.5CrxFe2−xO4 materials via sol–gel method and their characterizations

Fabrication of Co0.5Ni0.5CrxFe2−xO4 materials via sol–gel method and their characterizations

Investigation of Cr3+ doped Zn-Co nanoferrites as potential candidate for self-regulated magnetic hyperthermia applications

Novel nanoparticles with Cr3+ substituted ferrite for self-regulating temperature hyperthermia

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Investigation of Cr³⁺ doped Zn-Co nanoferrites as potential candidate for self-regulated magnetic hyperthermia applications

Novel nanoparticles with Cr³⁺ substituted ferrite for self-regulating temperature hyperthermia