title: Synthesis and characterization of zinc and calcium nanoferrites.
abstract: In this work, Zn(1-x)CaxFe(2)O(4) nanoparticles (x = 0, 0.5 and 1) have been synthesized by sol-gel method followed by heat treatment at a temperature within the range of 300-700 °C. The samples with appropriate saturation magnetization (Ms), low coercivity and remanence were Zn(0)Ca(1)Fe(2)O(4) treated at 300 °C (Ms ~ 25 emu/g), Zn(0)Ca(1)Fe(2)O(4) treated at 400 °C (Ms ~ 40 emu/g) and Zn(0.50)Ca(0.50)Fe(2)O(4) treated at 400 °C (Ms ~ 31 emu/g). These samples were analyzed by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and transmission electron microscopy. The heating ability of selected nanoparticles was evaluated under a magnetic field using a solid state induction heating equipment. The obtained nanoferrites showed a particle size within the range of 13-14 nm. The Zn(0)Ca(1)Fe(2)O(4) treated at 400 °C was able to heat the nanoferrite particles/water suspension (10 mg/2 ml) at a temperature of 44 °C under the selected magnetic field (10.2 kA/m and frequency 362 kHz). Additionally, in vitro bioactivity assessment was performed by immersing samples in a simulated body fluid for different periods of time at physiological conditions of pH and temperature. The samples showed an appropriate bioactivity. These nanoferrites are highly potential materials for hyperthermia treatment.
authors.affiliation: CINVESTAV IPN-Unidad Saltillo, Industria Metalúrgica 1062 Parque Industrial Saltillo Ramos Arizpe, C.P. 25900, Ramos Arizpe, Coahuila, Mexico, arg.jasso@gmail.com.
authors.forename: R A
authors.initials: RA
authors.lastname: Jasso-Terán
authors.forename: D A
authors.initials: DA
authors.lastname: Cortés-Hernández
authors.forename: E M
authors.initials: EM
authors.lastname: Múzquiz-Ramos
authors.forename: H J
authors.initials: HJ
authors.lastname: Sánchez-Fuentes
mesh_terms: D002118:Calcium / Q000737:chemistry*; D005290:Ferric Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry; D010316:Particle Size; D013052:Spectrometry, X-Ray Emission; D013696:Temperature; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D015032:Zinc; D002118:Calcium