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Special Issue "Magnet褨c Structure Compounds"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: 25 December 2020.

Special Issue Editors

Prof. Dr. Denis Vinnik

Guest Editor
Laboratory of Single crystal growth, South Ural State University, 76, Lenin prospekt, 454080 Chelyabinsk, Russia
Interests: functional magnetic oxides; single crystals; ceramics; crystal structure
Special Issues and Collections in MDPI journals
Dr. Andrey Starikov

Guest Editor
Material science and physics&chemistry of materials, South Ural State University (National Research University), 454080 Chelyabinsk, Russia

Special Issue Information

Dear Colleagues,

Magnetic structure compounds with a strong coupling of chemical composition, crystal/magnetic structure, and magnetic properties are very important today. A significant interest is due to deep fundamental and practical aspects. Chemical composition critically influences structural parameters and functional properties in magnetic structure compounds. New theoretical and experimental data lead to the emergence of new technologies that will make our world a better place. I kindly invite you to make a contribution to this Special Issue of Crystals titled as “Magnetic Structure Compounds”.

Prof. Dr. Denis Vinnik
Dr. Andrey Starikov 
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, . Manuscripts can be submitted until the deadline. All papers will be 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. Crystals 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 1600 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

  • Crystal structure
  • Magnetic structure
  • Functional materials
  • Magnetic oxides
  • Microstructure
  • Physical properties

Published Papers (3 papers)

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Research

Open AccessArticle
Magnetic Diagram of the High-Pressure Stabilized Multiferroic Perovskites of the BiFe1-yScyO3 Series
by , , , , , , , , , , and
Crystals 2020, 10(10), 950; - 17 Oct 2020
Abstract
Magnetic properties of the high-pressure stabilized perovskite BiFe1-yScyO3 phases (0.1 ≤ y ≤ 0.9) have been studied by means of magnetization measurements and neutron diffraction. The metastable perovskites of this series undergo irreversible polymorphic transformations upon annealing, [...] Read more.
Magnetic properties of the high-pressure stabilized perovskite BiFe1-yScyO3 phases (0.1 ≤ y ≤ 0.9) have been studied by means of magnetization measurements and neutron diffraction. The metastable perovskites of this series undergo irreversible polymorphic transformations upon annealing, the phenomenon referred to as conversion polymorphism. It has been found that the solid solutions with y ≥ 0.70 exhibit no long-range magnetic ordering regardless of their polymorph modification, while those with y ≤ 0.60 are all antiferromagnets. Depending on the scandium content, temperature and structural distortions, three types of the antiferromagnetic orderings, involving collinear, canted and cycloidal spin arrangements, have been revealed in the phases obtained via conversion polymorphism and the corresponding magnetic phase diagram has been suggested. Full article
(This article belongs to the Special Issue Magnet褨c Structure Compounds)
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Open AccessArticle
Crystal Growth and Investigation of High-Pressure Physical Properties of Fe2As
by , , , , , , , and
Crystals 2020, 10(9), 790; - 06 Sep 2020
Abstract
We reported the growth of Fe2As single crystals and the study of its physical properties via comprehensive measurements, such as transport properties under pressure and high-pressure synchrotron radiation X-ray diffraction. Fe2As is an antiferromagnetic metal with TN ~ [...] Read more.
We reported the growth of Fe2As single crystals and the study of its physical properties via comprehensive measurements, such as transport properties under pressure and high-pressure synchrotron radiation X-ray diffraction. Fe2As is an antiferromagnetic metal with TN ~ 355 K. Within the pressure range of 100 GPa, no superconductivity was observed above 2 K. The abrupt drop in resistance from 21 to 31.7 GPa suggests a high-pressure phase transition happens. The high-pressure X-ray experiments indicate a new high-pressure phase appears, starting from 27.13 GPa. After the refinement of the high-pressure X-ray data, the pressure dependence of lattice constants of Fe2As (P4/nmm phase) was plotted and the bulk modulus B0 was obtained to be 168.6 GPa. Full article
(This article belongs to the Special Issue Magnet褨c Structure Compounds)
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Open AccessArticle
Flux Single Crystal Growth of BaFe12鈭抶TixO19 with Titanium Gradient
by , , , , and
Crystals 2020, 10(4), 264; - 01 Apr 2020
Abstract
Titanium substituted barium hexaferrite BaFe12−xTixO19 single crystal was grown by the top seeded solution growth method from flux on the seed with controlled cooling below 1175 °C. Titanium substitution level gradient in the single crystal in the vertical [...] Read more.
Titanium substituted barium hexaferrite BaFe12−xTixO19 single crystal was grown by the top seeded solution growth method from flux on the seed with controlled cooling below 1175 °C. Titanium substitution level gradient in the single crystal in the vertical and horizontal directions was studied. Two planes were cut and polished. A justification for the linear gradient of Ti substitution in a BaFe12−xTixO19 single crystal is proposed; substitution levels in the center and periphery were determined. It was shown that upon growth by the top seeded solution growth method, crystals with a linear Ti substitution level gradient from x = 0.73 to x = 0.77 for a distance of 11 mm along pulling direction were obtained. The study led to the conclusion about the relationship of the gradient and changes in the composition of the nutrient solution. Full article
(This article belongs to the Special Issue Magnet褨c Structure Compounds)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Poly (caprolactone)-poly (N-isopropyl acrylamide)-Fe3O4 Magnetic Nanofibrous Structure with Stimuli Responsive Drug Release

Affiliation: 1 Biomaterials Research Group, Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

2 Department of Cellular Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran
Abstract: Poly (caprolactone; PCL) - poly (N-isopropylacrylamie; PNIPAAm) - Fe3O4 fiber, that can be magnetically actuated, is reported. Here, we engineer a structure that can be utilized as a smart carrier for the release of chemotherapeutic drug via magneto-thermal activation, with the aid of magnetic nanoparticles (MNPs). The drug release, magnetic, hyperthermia and cellular cytotoxicity is evaluated. Scanning electron microscopy (SEM) showed a decrease in fiber diameter by increasing MNPs concentration. The magnetic measurement of the fibers revealed a saturation magnetization values within the range of 1.2-2.2 emu/g. The magnetic PCL-PNIPAAm- Fe3O4 scaffold showed a specific loss power (SLP) value of 4/19 W/g at 20wt% MNPs. Hydrophilic properties of the scaffolds were confirmed through swelling percentage evaluation following immersion in phosphate buffer solution. A temperature increase of 40 oC led to a 600% swelling after only 3 h. Using doxorubicin (DOX) as a model drug, we demonstrated that a controllable drug release profile can be achieved. Almost 39% of the total drug loaded was released after 96 h at 37 oC, while 25% drug release in 3 h at 40 oC was detected. The non-cytotoxic effect, coupled with magneto-thermal property and controlled drug release, renders enormous potential for these fibers to be used as a smart drug-release agent for localized cancer therapy.

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