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Crystals
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Raman Spectroscopy of Crystals Volume II
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Raman Spectroscopy of Crystals Volume II

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

Deadline for manuscript submissions: closed (10 October 2021) | Viewed by 12506

Special Issue Editor

Dr. Alexander S. Krylov

E-Mail Website
Guest Editor
Laboratory of Molecular Spectroscopy, L. V. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Academgorodok 50/38, 660036 Krasnoyarsk, Russia
Interests: phase transitions; high pressure; Raman spectroscopy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Raman spectroscopy has made remarkable progress in recent years as a technique for the investigation of crystalline matter. Raman scattering depends on the polarization and direction of incident and scattered light. The crystal symmetry and orientation also play a significant role. Raman spectroscopy could give a piece of unique information during the study of crystal phase transformations, involving but not limited to order–disorder phenomena, polymorphs, chemical diffusion, and shifts in solid–solution properties. Researchers use Raman spectroscopy during the in situ study of crystals in extreme conditions—under high pressure, at high temperatures, or both simultaneously; at low temperatures; or in electric or magnetic fields. Another aspect that merits attention is the possibility of analyzing nanocrystals, 2D crystals, and many others. Research can take place both in the laboratory and in the field for scientific or industrial interests. The properties of both newly synthesized crystals and well-known ones are being studied.

The Special Issue on “Raman Spectroscopy of Crystals Volume II” has the aim of providing a forum for describing and discussing recent achievements in crystalline matter Raman spectroscopy—whether theoretical or experimental, basic or applied research. Contributions are discussing the interconnections between crystal structure, chemical, and physical properties with Raman spectra. Modern discoveries are the principal reason for producing the current Special Issue, and submissions covering these are most welcome.

Researchers working in a wide range of disciplines are invited to contribute to this Special Issue. The topics summarized under the keywords given below are only broad examples of the more significant number of topics in mind. The volume is open not only to original manuscripts but also to feature and short review articles of current hot topics.

Dr. Alexander S. Krylov
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. 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 2600 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

  • Raman spectroscopy of solid and liquid crystals
  • Structural phase transition and lattice dynamics
  • Soft phonon modes
  • Raman spectroscopy of crystals under extreme conditions: high pressure, temperature, and magnetic and electric fields
  • Nonlinear Raman spectroscopy
  • Raman spectroscopy of minerals for solving problems in mineralogy, gemology, and petrology
  • Raman spectroscopy in space exploration
  • Practical applications of Raman spectroscopy in materials, life sciences, and earth sciences

Related Special Issue

Published Papers (4 papers)

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Research

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25 pages, 8705 KiB  
Article
Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2
by Yuriy G. Denisenko, Maxim S. Molokeev, Aleksandr S. Oreshonkov, Alexander S. Krylov, Aleksandr S. Aleksandrovsky, Nikita O. Azarapin, Oleg V. Andreev, Illaria A. Razumkova and Victor V. Atuchin
Crystals 2021, 11(9), 1027; https://doi.org/10.3390/cryst11091027 - 26 Aug 2021
Cited by 43 | Viewed by 3874
Abstract
Crystalline hydrate of double cesium europium sulfate [CsEu(H2O)3(SO4)2]·H2O was synthesized by the crystallization from an aqueous solution containing equimolar amounts of 1Cs+:1Eu3+:2SO42− ions. Anhydrous salt CsEu(SO4 [...] Read more.
Crystalline hydrate of double cesium europium sulfate [CsEu(H2O)3(SO4)2]·H2O was synthesized by the crystallization from an aqueous solution containing equimolar amounts of 1Cs+:1Eu3+:2SO42− ions. Anhydrous salt CsEu(SO4)2 was formed as a result of the thermal dehydration of the crystallohydrate. The unusual effects observed during the thermal dehydration were attributed to the specific coordination of water molecules in the [CsEu(H2O)3(SO4)2]·H2O structure. The crystal structure of [CsEu(H2O)3(SO4)2]·H2O was determined by a single crystal X-ray diffraction analysis, and the crystal structure of CsEu(SO4)2 was obtained by the Rietveld method. [CsEu(H2O)3(SO4)2]·H2O crystallizes in the monoclinic system, space group P21/c (a = 6.5574(1) Å, b = 19.0733(3) Å, c = 8.8364(2) Å, β = 93.931(1)°, V = 1102.58(3) Å3). The anhydrous sulfate CsEu(SO4)2 formed as a result of the thermal destruction crystallizes in the monoclinic system, space group C2/c (a = 14.327(1) Å, b = 5.3838(4) Å, c = 9.5104(6) Å, β = 101.979(3) °, V = 717.58(9) Å3). The vibration properties of the compounds are fully consistent with the structural models and are mainly determined by the deformation of non-rigid structural elements, such as H2O and SO42−. As shown by the diffused reflection spectra measurements and DFT calculations, the structural transformation from [CsEu(H2O)3(SO4)2]·H2O to CsEu(SO4)2 induced a significant band gap reduction. A noticeable difference of the luminescence spectra between cesium europium sulfate and cesium europium sulfate hydrate is detected and explained by the variation of the extent of local symmetry violation at the crystallographic sites occupied by Eu3+ ions, namely, by the increase in inversion asymmetry in [CsEu(H2O)3(SO4)2]·H2O and the increase in mirror asymmetry in CsEu(SO4)2. The chemical shift of the 5D0 energy level in cesium europium sulfate hydrate, with respect to cesium europium sulfate, is associated with the presence of H2O molecules in the vicinity of Eu3+ ion. Full article
(This article belongs to the Special Issue Raman Spectroscopy of Crystals Volume II)
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13 pages, 2464 KiB  
Article
Angle-Resolved Intensity of Polarized Micro-Raman Spectroscopy for 4H-SiC
by Ying Chang, Aixia Xiao, Rubing Li, Miaojing Wang, Saisai He, Mingyuan Sun, Lizhong Wang, Chuanyong Qu and Wei Qiu
Crystals 2021, 11(6), 626; https://doi.org/10.3390/cryst11060626 - 31 May 2021
Cited by 10 | Viewed by 3625
Abstract
Raman spectroscopy is an indispensable method for the nondestructive testing of semiconductor materials and their microstructures. This paper presents a study on the angle-resolved intensity of polarized micro-Raman spectroscopy for a 4H silicon carbide (4H-SiC) wafer. A generalized theoretical model of polarized Raman [...] Read more.
Raman spectroscopy is an indispensable method for the nondestructive testing of semiconductor materials and their microstructures. This paper presents a study on the angle-resolved intensity of polarized micro-Raman spectroscopy for a 4H silicon carbide (4H-SiC) wafer. A generalized theoretical model of polarized Raman intensity was established by considering the birefringence effect. The distributions of angle-resolved Raman intensities were achieved under normal and oblique backscattering configurations. Experiments were performed on a self-built angle-resolved Raman system, which verified the validity of the proposed model and achieved the identification of crystal orientations of the 4H-SiC sample. Full article
(This article belongs to the Special Issue Raman Spectroscopy of Crystals Volume II)
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6 pages, 6243 KiB  
Article
Structural Phase Transition in (NH4)3GeF7–Raman Spectroscopy Data
by Yulia Gerasimova, Natalia Laptash, Alexander Krylov, Vita Vonog and Alexander Vtyurin
Crystals 2021, 11(5), 506; https://doi.org/10.3390/cryst11050506 - 03 May 2021
Cited by 1 | Viewed by 1520
Abstract
We obtained Raman spectra of (NH4)3GeF7 crystals with a wide range of frequencies (10–3400 cm−1) and temperatures (8–300 K), including phase transition, which was accompanied by a symmetry increase with a temperature decrease. The internal vibrations [...] Read more.
We obtained Raman spectra of (NH4)3GeF7 crystals with a wide range of frequencies (10–3400 cm−1) and temperatures (8–300 K), including phase transition, which was accompanied by a symmetry increase with a temperature decrease. The internal vibrations of the GeF62− group were classified by the positional symmetry method. Considerable transformations of the Raman spectra were observed at the lower frequency range of lattice vibrations and the ranges of the internal vibrations of the ammonium ions. In contrast, the internal modes of the GeF62− groups changed only slightly due to their resonance splitting in the multiplied unit cell, which agreed well with the proposed phase transition mechanism induced by ammonium group ordering. Full article
(This article belongs to the Special Issue Raman Spectroscopy of Crystals Volume II)
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Review

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37 pages, 12974 KiB  
Review
Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals
by Nikolay V. Sidorov, Natalia A. Teplyakova, Olga V. Makarova, Mikhail N. Palatnikov, Roman A. Titov, Diana V. Manukovskaya and Irina V. Birukova
Crystals 2021, 11(5), 458; https://doi.org/10.3390/cryst11050458 - 21 Apr 2021
Cited by 10 | Viewed by 2683
Abstract
Defect structure of nominally pure lithium niobate crystals grown from a boron doped charge have been studied by Raman and optical spectroscopy, laser conoscopy, and photoinduced light scattering. An influence of boron dopant on optical uniformity, photoelectrical fields values, and band gap have [...] Read more.
Defect structure of nominally pure lithium niobate crystals grown from a boron doped charge have been studied by Raman and optical spectroscopy, laser conoscopy, and photoinduced light scattering. An influence of boron dopant on optical uniformity, photoelectrical fields values, and band gap have been also studied by these methods in LiNbO3 crystals. Despite a high concentration of boron in the charge (up to 2 mol%), content in the crystal does not exceed 10−4 wt%. We have calculated that boron incorporates only into tetrahedral voids of crystal structure as a part of groups [BO3]3−, which changes O–O bonds lengths in O6 octahedra. At this oxygen–metal clusters MeO6 (Me: Li, Nb) change their polarizability. The clusters determine optically nonlinear and ferroelectric properties of a crystal. Chemical interactions in the system Li2O–Nb2O5–B2O3 have been considered. Boron, being an active element, structures lithium niobate melt, which significantly influences defect structure and physical properties of a crystal grown from such a melt. At the same time, amount of defects NbLi and concentration of OH groups in LiNbO3:B is close to that in stoichiometric crystals; photorefractive effect, optical, and compositional uniformity on the contrary is higher. Full article
(This article belongs to the Special Issue Raman Spectroscopy of Crystals Volume II)
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