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Crystals
Special Issues
Polycrystalline Materials—from Microstructure Characterization to Applications
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Polycrystalline Materials—from Microstructure Characterization to Applications

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: closed (20 December 2024) | Viewed by 3637

Special Issue Editors

Dr. Aurelia Visa

E-Mail Website
Guest Editor
“Coriolan Dragulescu” Institute of Chemistry, Romanian Academy, 300223 Timisoara, Romania
Interests: green chemistry; metal organic frameworks; post-synthesis of polycrystaline materials
Special Issues, Collections and Topics in MDPI journals
Dr. Rosario Mercedes Pérez Colodrero

E-Mail Website
Guest Editor
Dpto Química Inorgánica, Cristalografía y Mineralogía. Facultad de Ciencias. Universidad de Málaga, 29071 Málaga, Spain
Interests: metal phosphonates; coordination polymers; proton conductivity; composite membrane; PEMFCs; electrocatalyst
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the last few years, significant research efforts have been devoted to designing, fabricating, and exploiting polycrystalline materials. Polycrystalline materials, as a complex structural material, have excellent mechanical, physical, and chemical properties. As a result, polycrystalline materials are widely used in many fields, such as aerospace, automotive, electronics, energy, etc. By understanding and researching the preparation methods, performance characterization, and application fields of polycrystalline materials, reference and guidance can be provided for their further application and development.

This Special Issue links the synthesis process with the crystal structure and microstructure of the compounds produced, as well as their properties and potential applications. We welcome all scientists, scholars, engineers, and experts working in the fields of X-ray diffraction, microstructure analysis, or chemical performance testing to submit your research reports for evaluation and help this Special Issue to provide valuable contributions for the scientific community.

In this regard, we cordially welcome researchers working in the field to submit their contributions on the aforementioned aspects and on other subjects relevant to the theme. Original research articles, reviews, and short communications are all suitable submissions. Organometallic molecules, in addition to purely organic systems, are also deemed suitable for submissions.

Dr. Aurelia Visa
Dr. Rosario Mercedes Pérez Colodrero
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, 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. 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 2100 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

  • polycrystalline materials
  • microstructural analysis
  • polycrystalline thin films
  • solvothermal synthesis
  • mechanism
  • model
  • performance characterization
  • preparation methods
  • porous materials
  • magnetic materials
  • covalent organometallic frameworks
  • post-synthesis of porous materials
  • morphology tuning
  • processing of polycrystalline materials
  • high surface area materials
  • supramolecular interactions
  • metal–organic frameworks (MOFs)
  • layered materials
  • polymers

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Published Papers (3 papers)

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Research

17 pages, 5195 KiB  
Article
Influence of Y2O3 Concentration on the Optical Properties of Multicomponent Glasses and Glass–Ceramics
by Akram Beniaiche, Nabil Belkhir, Berta Pérez-Román, Juan Rubio and Fausto Rubio
Crystals 2024, 14(11), 970; https://doi.org/10.3390/cryst14110970 - 9 Nov 2024
Viewed by 532
Abstract
The optical properties and structural characterization of multicomponent silicate glasses of low Al2O3 and different Y2O3 concentrations have been studied. These glasses have also been crystallized to obtain glass–ceramic materials, and their properties have been characterized. The [...] Read more.
The optical properties and structural characterization of multicomponent silicate glasses of low Al2O3 and different Y2O3 concentrations have been studied. These glasses have also been crystallized to obtain glass–ceramic materials, and their properties have been characterized. The obtained glasses were transparent and their refractive indexes increased with Y2O3 concentration. After a heat treatment at 930 °C for 10 min, these glasses maintained their transparency, but a brown color appeared, and after 30 min, those glasses with high Y2O3 concentrations turned opaque or white in color. These processes of crystallization for obtaining the new glass–ceramics have been studied by means of FTIR and Raman spectroscopies, and the crystallized materials were characterized with XRD and FE-SEM techniques. These glasses and glass–ceramics have also been characterized by means of UV–vis spectroscopy, and the corresponding optical properties (reflectance, color, band-gap) have been determined as a function of the Y2O3 concentrations and the structural properties. Full article
(This article belongs to the Special Issue Polycrystalline Materials—from Microstructure Characterization to Applications)
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14 pages, 12082 KiB  
Article
Cluster Odd-Parity Multipoles by Staggered Orbital Ordering in Locally Noncentrosymmetric Crystals
by Satoru Hayami
Crystals 2024, 14(7), 632; https://doi.org/10.3390/cryst14070632 - 9 Jul 2024
Viewed by 743
Abstract
Odd-parity multipoles in crystals manifest themselves not only in their peculiar electronic orderings but also in unconventional parity-violating physical phenomena. We here report the emergence of odd-parity multipoles by considering staggered orbital orderings in a locally noncentrosymmetric crystal system with the global inversion [...] Read more.
Odd-parity multipoles in crystals manifest themselves not only in their peculiar electronic orderings but also in unconventional parity-violating physical phenomena. We here report the emergence of odd-parity multipoles by considering staggered orbital orderings in a locally noncentrosymmetric crystal system with the global inversion center but without the inversion center at each lattice site. We show that various odd-parity multipoles, such as the electric toroidal monopole, electric dipole, and electric toroidal quadrupole, are realized depending on the type of orbital orderings in the one-dimensional zigzag chain. Such odd-parity multipoles give rise to an antisymmetric spin splitting in the electronic band structure with the aid of the relativistic spin–orbit coupling. We also show that similar states with odd-parity multipoles are realized in other locally noncentrosymmetric crystals, such as the two-dimensional honeycomb and three-dimensional diamond structures. Full article
(This article belongs to the Special Issue Polycrystalline Materials—from Microstructure Characterization to Applications)
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18 pages, 1656 KiB  
Article
London Dispersive and Lewis Acid-Base Surface Energy of 2D Single-Crystalline and Polycrystalline Covalent Organic Frameworks
by Tayssir Hamieh
Crystals 2024, 14(2), 148; https://doi.org/10.3390/cryst14020148 - 31 Jan 2024
Cited by 9 | Viewed by 1774
Abstract
This paper is devoted to an accurate determination of the London dispersive, polar free energy of adsorption, Lewis acid γs+ and Lewis base γs− components of the polar surface energy γsAB of 2D single-crystalline and polycrystalline [...] Read more.
This paper is devoted to an accurate determination of the London dispersive, polar free energy of adsorption, Lewis acid γs+ and Lewis base γs− components of the polar surface energy γsAB of 2D single-crystalline and polycrystalline covalent organic frameworks such as TAPPy-TPA-COFs. The obtained results showed the highest values of polar and total surface energy of the polycrystalline COF relative to those of the single-crystalline COF. Inverse gas chromatography (IGC) at infinite dilution was used to quantify the various surface parameters of the different materials. The net retention times of the adsorption of n-alkanes and several polar solvents on single-crystalline and polycrystalline covalent organic frameworks were obtained from IGC measurements. The free surface Gibbs energy of adsorption was obtained for the various organic molecules at different temperatures from their net retention volume values. The separation between the London dispersive energy and the polar energy of adsorbed molecules was carried out by using a new thermodynamic parameter PSX chosen as new indicator variable and taking into account the deformation polarizability and the harmonic mean of the ionization energies of solvents and solid materials, derived from the London dispersion equation. The obtained results gave higher acidity (KA=0.22) for the 2D polycrystalline COF than that of the single-crystalline COF (KA=0.15) and an equivalent basicity of the two COFs. The obtained results are very promising for the accurate determination of the surface thermodynamic parameters of adsorption of organic solvents on solid surfaces. Full article
(This article belongs to the Special Issue Polycrystalline Materials—from Microstructure Characterization to Applications)
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