The anhydrous solid trehalose: Low-temperature EPR study of glassy and boson peak modes.
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| Title: | The anhydrous solid trehalose: Low-temperature EPR study of glassy and boson peak modes. |
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| Authors: | Kveder, M.1 kveder@irb.hr, Šarić, I.2, Merunka, D.1, Jokić, M.1, Valić, S.1,3, Rakvin, B.1 |
| Source: | Journal of Non-Crystalline Solids. Sep2013, Vol. 375, p19-24. 6p. |
| Subjects: | Trehalose, Low temperatures, Electron spin, Spin-lattice relaxation, Electron paramagnetic resonance spectroscopy, Bosons, Metallic glasses |
| Abstract: | Abstract: Electron spin–lattice relaxation times (T 1) were measured by X-band electron paramagnetic resonance (EPR) spectroscopy in irradiated trehalose glass (TR-G) and trehalose-β crystalline state (TR-C) from 5 to 290K. Throughout the whole temperature interval studied, a consistently shorter T 1 was observed in TR-G than TR-C while the largest difference was detected below ca. 80K. Here, the theoretical analysis within the soft potential model pointed to the two mechanisms responsible for a more efficient energy exchange between the spin system and the lattice in TR-G: the thermally activated dynamics of glassy modes and the Raman process with boson peak (BP) modes. In this context, the glassy polymorph of anhydrous trehalose corroborates the idea that the boson peak, being a universal property of amorphous/disordered solids, can be studied by EPR even at X-band frequencies. It is further suggested that the mechanisms, involving glassy/soft/BP modes, which provide additional channel for the electron spin coupling with the lattice in glassy as compared to the crystalline state, could be proposed as a universal phenomenon aiming to explain the electron spin relaxation in disordered matrices at temperatures above a few Kelvin in general. [Copyright &y& Elsevier] |
| Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 89311508 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The anhydrous solid trehalose: Low-temperature EPR study of glassy and boson peak modes. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kveder%2C+M%2E%22">Kveder, M.</searchLink><relatesTo>1</relatesTo><i> kveder@irb.hr</i><br /><searchLink fieldCode="AR" term="%22Šarić%2C+I%2E%22">Šarić, I.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Merunka%2C+D%2E%22">Merunka, D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jokić%2C+M%2E%22">Jokić, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Valić%2C+S%2E%22">Valić, S.</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Rakvin%2C+B%2E%22">Rakvin, B.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Non-Crystalline+Solids%22">Journal of Non-Crystalline Solids</searchLink>. Sep2013, Vol. 375, p19-24. 6p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Trehalose%22">Trehalose</searchLink><br /><searchLink fieldCode="DE" term="%22Low+temperatures%22">Low temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+spin%22">Electron spin</searchLink><br /><searchLink fieldCode="DE" term="%22Spin-lattice+relaxation%22">Spin-lattice relaxation</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+paramagnetic+resonance+spectroscopy%22">Electron paramagnetic resonance spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Bosons%22">Bosons</searchLink><br /><searchLink fieldCode="DE" term="%22Metallic+glasses%22">Metallic glasses</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Electron spin–lattice relaxation times (T 1) were measured by X-band electron paramagnetic resonance (EPR) spectroscopy in irradiated trehalose glass (TR-G) and trehalose-β crystalline state (TR-C) from 5 to 290K. Throughout the whole temperature interval studied, a consistently shorter T 1 was observed in TR-G than TR-C while the largest difference was detected below ca. 80K. Here, the theoretical analysis within the soft potential model pointed to the two mechanisms responsible for a more efficient energy exchange between the spin system and the lattice in TR-G: the thermally activated dynamics of glassy modes and the Raman process with boson peak (BP) modes. In this context, the glassy polymorph of anhydrous trehalose corroborates the idea that the boson peak, being a universal property of amorphous/disordered solids, can be studied by EPR even at X-band frequencies. It is further suggested that the mechanisms, involving glassy/soft/BP modes, which provide additional channel for the electron spin coupling with the lattice in glassy as compared to the crystalline state, could be proposed as a universal phenomenon aiming to explain the electron spin relaxation in disordered matrices at temperatures above a few Kelvin in general. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jnoncrysol.2013.05.016 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 19 Subjects: – SubjectFull: Trehalose Type: general – SubjectFull: Low temperatures Type: general – SubjectFull: Electron spin Type: general – SubjectFull: Spin-lattice relaxation Type: general – SubjectFull: Electron paramagnetic resonance spectroscopy Type: general – SubjectFull: Bosons Type: general – SubjectFull: Metallic glasses Type: general Titles: – TitleFull: The anhydrous solid trehalose: Low-temperature EPR study of glassy and boson peak modes. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kveder, M. – PersonEntity: Name: NameFull: Šarić, I. – PersonEntity: Name: NameFull: Merunka, D. – PersonEntity: Name: NameFull: Jokić, M. – PersonEntity: Name: NameFull: Valić, S. – PersonEntity: Name: NameFull: Rakvin, B. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2013 Type: published Y: 2013 Identifiers: – Type: issn-print Value: 00223093 Numbering: – Type: volume Value: 375 Titles: – TitleFull: Journal of Non-Crystalline Solids Type: main |
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