Special Issue "Crystal Structure of Magnetic Materials"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystal Engineering".

Deadline for manuscript submissions: closed (1 October 2017)

Special Issue Editor

Guest Editor
Dr. Alex V. Morozkin

Department of Chemistry, Moscow State University, Leninskie Gory, House 1, Building 3, Moscow, GSP-2, 119991, Russia
Website | E-Mail
Interests: rare earth compounds; ternary phase diagram; crystal structure; magnetic properties; magnetocaloric effect; neutron diffraction; magnetic structure

Special Issue Information

Dear Colleagues,

This Special Issue of Crystals reflects a new step in crystal chemistry that is characterized by the real development of instruments and methods for investigation and analyses.

For rare earth intermetallics/compounds, they are: (a) the development of X-ray and neutron diffractometers, X-ray EDS spectrometers, and magnetometers; and (b) the development of software/databases and methods for the analysis of their crystal structures, magnetic structures, and magnetic properties.

Rare earth intermetallics/compounds are interesting, as they exhibit unique crystal structures and show a massive coercive force and magnetocaloric properties, and they are interesting in potential applications for magnetic refrigerators and permanent magnets.

The development of instruments and methods permits to determine the specific features of phase diagram “rare earth-transition metal-p-element”, the crystal structure of rare earth compounds and their solid solutions, and magnetic structures and properties of rare earth compounds. Additionally, this permits to modify the physical properties of rare earth compounds using an optimal method, obtaining, e.g., giant magnetocaloric effects and coercive fields. This Special Issue should reflect this.

Dr. Alex V. Morozkin
Guest Editor

Manuscript Submission Information

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Keywords

  • Rare earth compounds
  • Ternary phase diagram
  • Crystal structure
  • Magnetic properties

Published Papers (2 papers)

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Research

Open AccessArticle Impact of Annealing Temperature on the Physical Properties of the Lanthanum Deficiency Manganites
Crystals 2017, 7(10), 301; doi:10.3390/cryst7100301
Received: 20 August 2017 / Revised: 22 September 2017 / Accepted: 2 October 2017 / Published: 5 October 2017
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Abstract
The lanthanum deficiency manganites La0.8-x□xCa0.2MnO3 (x = 0, 0.1 and 0.2), where □ is a lanthanum vacancy, were prepared using the classic ceramic methods with different thermal treatments (1373 K and 973 K).
[...] Read more.
The lanthanum deficiency manganites La0.8-x□xCa0.2MnO3 (x = 0, 0.1 and 0.2), where □ is a lanthanum vacancy, were prepared using the classic ceramic methods with different thermal treatments (1373 K and 973 K). The structural, magnetic, and magnetocaloric properties of these compounds were studied as a function of annealing temperature. It was noted that the annealing temperature did not affect the crystal structure of our samples (orthorhombic structure with Pnma space group). Nevertheless, a change in the variation of the unit cell volume V, the average bond length dMn–O, and the average bond angles θMn–O–Mn were observed. Magnetization versus temperature study has shown that all samples exhibited a magnetic transition from ferromagnetic (FM) to paramagnetic (PM) phase with increasing temperature. However, it can be clearly seen that the annealing at 973 K induced an increase of the magnetization. In addition, the magnetocaloric effect (MCE) as well as the relative cooling power (RCP) were estimated. As an important result, the values of MCE and RCP in our Lanthanum-deficiency manganites are reported to be near to those found in gadolinium, considered as magnetocaloric reference material. Full article
(This article belongs to the Special Issue Crystal Structure of Magnetic Materials)
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Open AccessArticle Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds
Crystals 2017, 7(6), 156; doi:10.3390/cryst7060156
Received: 16 April 2017 / Revised: 9 May 2017 / Accepted: 13 May 2017 / Published: 27 May 2017
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Abstract
The structural, magnetic, and magnetocaloric properties of Er6Fe23−xAlx (x = 0 and 3) intermetallic compounds have been studied systematically. Samples were prepared using the arc furnace by annealing at 1073 K for one week. Rietveld analysis of XRD
[...] Read more.
The structural, magnetic, and magnetocaloric properties of Er6Fe23−xAlx (x = 0 and 3) intermetallic compounds have been studied systematically. Samples were prepared using the arc furnace by annealing at 1073 K for one week. Rietveld analysis of XRD shows the formation of pure crystalline phase with cubic Fm-3m structure. Refinement results show that the unit cell volume decreases with increasing Al content. The Curie temperature Tc of the prepared samples was found to be strongly dependent on the aluminum content. This reduces magnetization and the ferrimagnetic phase transition temperature (Tc) from 481 K (for x = 0) to 380 K (for x = 3), is due to the substitution of magnetic element (Fe) by non-magnetic atoms (Al). With the increase of the Al content, a decrease in the values of magnetic entropy is observed. The magnitude of the isothermal magnetic entropy (|∆SM|) at the Tc decreases from 1.8 J/kg·K for x = 0 to 0.58 J/kg·K for x = 3 for a field change 14 kOe. Respectively, the relative cooling power (RCP) decreases with increasing Al content reaching 42 Jkg−1 for x = 0 to 28 Jkg−1 for x = 3. Full article
(This article belongs to the Special Issue Crystal Structure of Magnetic Materials)
Figures

Figure 1

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