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Magnetochemistry
Special Issues
Magnetic Materials and Their Electronic and Thermokinetic Properties
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Magnetic Materials and Their Electronic and Thermokinetic Properties

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: closed (15 October 2021) | Viewed by 6702
Joint Special Issue in /Applied Sciences/: Magnetic Materials and Their Electronic and Thermokinetic Properties

Special Issue Editor

Dr. Cristina Bartha

E-Mail Website
Guest Editor
National Institute of Materials Physics (NIMP), Magnetism and Superconductivity Department, RO77125 Bucharest, Magurele, Romania
Interests: magnetic materials; thermal analysis; thermokinetic processes; crystallization mechanisms
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Multiple valence magnetic materials have been of interest in recent years, especially for their capacity to form diverse structures with various compositions showing a wide variety of properties. The key element of this Special Issue of Magnetochemistry is to correlate the electronic properties (magnetic, oxygen ionic conductivity, electronic transport, and thermal expansion, even those potentially catalytic) of new multivalent magnetic materials processed by different routes with their structures, site occupation, valence, and spin states as well as the level of determined stoichiometry of new compounds. Using unconventional processing, as well as various substitutions involving different valence states, can generate new occupancy by pairs of ions and/or novel and unexpected behaviors which may have a strong impact on the development of modern materials. A major contribution to select the optimum conditions for synthesis will be provided by complex thermo-kinetic analysis. Information about optimal parameters (e.g., temperature, the reaction atmosphere, heating rate for an accurate processing reaction, activation energies, thermokinetic mechanisms) will be used to approach the problems of predictions and/or optimization of processing routes more in depth.

You may choose our Joint Special Issue in Applied Sciences.

Dr. Cristina Bartha
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Magnetochemistry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Magnetic materials
  • Unconventional processing routes
  • Complex thermal and thermokinetic analysis
  • Mechanism of reactions
  • The correlation of electronic properties with synthesis conditions

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Published Papers (2 papers)

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Research

10 pages, 4240 KiB  
Article
Structural and Optical Characterization of Silica Nanospheres Embedded with Monodisperse CeO2-Eu3+ Nanocrystals
by Corina Secu, Cristina Bartha, Elena Matei, Cristian Radu and Mihail Secu
Magnetochemistry 2022, 8(2), 22; https://doi.org/10.3390/magnetochemistry8020022 - 4 Feb 2022
Cited by 1 | Viewed by 2885
Abstract
Luminescent nanocrystals embedded into silica microspheres were shown to be useful for silica labeling for biological applications, ensuring mechanical and chemical stability, nontoxicity, biocompatibility and optical properties. We used sol–gel technology to prepare silica nanospheres embedded with fluorescent and magnetic Eu3+(1 [...] Read more.
Luminescent nanocrystals embedded into silica microspheres were shown to be useful for silica labeling for biological applications, ensuring mechanical and chemical stability, nontoxicity, biocompatibility and optical properties. We used sol–gel technology to prepare silica nanospheres embedded with fluorescent and magnetic Eu3+(1 mol%)-doped CeO2 nanocrystals. The X-ray diffraction pattern analysis and transmission electron microscopy investigations showed CeO2:Eu3+(1 mol%) nanocrystals of about 9 nm size and Ce3+ ions substitution by the Eu3+ ions; the nanocrystals dispersed inside the nanosized silica spheres of about 400 nm diameters. The photoluminescence spectra recorded under UV-light excitation showed Eu3+ ions luminescence peaks (5D0-7FJ, J = 0–4) accompanied by a weaker 425 nm luminescence due to the silica matrix; the quantum yield was 0.14. The weak hysteresis loop and magnetization curves recorded up to 20,000 Oe showed dominantly paramagnetic behavior associated with the silica matrix; a slight opening of the hysteresis loop to a very small magnetic field (about 0.005 Oe) was due to the presence of the two rare earth ions. The photonic crystal properties of SiO2-CeO2:Eu3+(1 mol%) silica nanospheres deposited as films on quartz plates were revealed by the two weak attenuation peaks at 420 and 500 nm and were associated with the reflection from different planes. The SiO2-CeO2:Eu3+(1 mol%) nanospheres are attractive potential candidates for photonics-related applications or for multifunctional bio-labels by combining the luminescence and magnetic properties of the nanocrystals. Full article
(This article belongs to the Special Issue Magnetic Materials and Their Electronic and Thermokinetic Properties)
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15 pages, 2389 KiB  
Article
Soft Chemistry Synthesis and Characterization of CoFe1.8RE0.2O4 (RE3+ = Tb3+, Er3+) Ferrite
by Dana Gingasu, Ioana Mindru, Adelina-Carmen Ianculescu, Lucian Diamandescu, Vasile-Adrian Surdu, Gabriela Marinescu, Cristina Bartha, Silviu Preda, Marcela Popa and Mariana Carmen Chifiriuc
Magnetochemistry 2022, 8(2), 12; https://doi.org/10.3390/magnetochemistry8020012 - 19 Jan 2022
Cited by 7 | Viewed by 2795
Abstract
Nanosized CoFe1.8RE0.2O4 (RE3+ = Tb3+, Er3+) ferrites were obtained through wet ferritization method. These ferrites were characterized by X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM/HR-TEM), Fourier transform infrared spectroscopy [...] Read more.
Nanosized CoFe1.8RE0.2O4 (RE3+ = Tb3+, Er3+) ferrites were obtained through wet ferritization method. These ferrites were characterized by X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM/HR-TEM), Fourier transform infrared spectroscopy (FTIR), Mössbauer spectroscopy and magnetic measurements. The XRD results revealed that the average crystallite size is 5.77 nm for CoFe1.8Tb0.2O4 and 6.42 nm for CoFe1.8Er0.2O4. Distribution of metal cations in the spinel structure estimated from X-ray diffraction data showed that the Tb3+ and Er3+ ions occupy the octahedral sites. TEM images indicated the presence of polyhedral particles with average size 5.91 nm for CoFe1.8Tb0.2O4 and 6.80 nm for CoFe1.8Er0.2O4. Room temperature Mössbauer spectra exhibit typical nanoscaled cobalt ferrite spectra in good agreement with XRD and TEM data. The saturation magnetization value (Ms) is 60 emu/g for CoFe1.8Tb0.2O4 and 80 emu/g for CoFe1.8Er0.2O4. CoFe1.8RE0.2O4 nanoparticles showed similar antimicrobial efficacy against the five tested microbial strains, both in planktonic and biofilm state. The results highlight the promising potential of these types of nanoparticles for the development of novel anti-biofilm agents and materials. Full article
(This article belongs to the Special Issue Magnetic Materials and Their Electronic and Thermokinetic Properties)
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