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    The trigonal polymorph of strontium tetraborate, beta-SrB4O7 [Text] / A. D. Vasiliev, A. V. Cherepakhin, A. I. Zaitsev // Acta Crystallogr. Sect. E.-Struct Rep. Online. - 2010. - Vol. 66, Part 6. - PI48-U132, DOI 10.1107/S1600536810019069. - Cited Reference Count: 22. - Гранты: We thank the State Program for Support of Leading Scientific Schools (grant LS-4645.2010.2.). - Финансирующая организация: Leading Scientific Schools [LS-4645.2010.2] . - JUN. - ISSN 1600-5368
Рубрики:
CRYSTAL-STRUCTURE
   SRB4O7
   LUMINESCENCE
   MODEL
Кл.слова (ненормированные):
Tetra
Аннотация: The asymmetric unit of the title compound, beta-SrB4O7, contains five Sr atoms (three located on a threefold rotation axis), twelve B and 21 O atoms. The structure is made up from BO3 triangles and BO4 tetrahedra in a 1:1 ratio. Pairs of BO3 triangles are linked to BO4 tetrahedra via common corners, forming chains. These chains are further linked to adjacent chains through corner-sharing, leading to a three-dimensional framework with channels running parallel to [001]. The Sr2+ ions reside in the channels and exhibit strongly distorted polyhedra The density of the beta-polymorph is considerably lower than that of beta-SrB4O7, which is constructed solely from BO4 tetrahedra.

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Держатели документа:
Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Vasiliev, Alexander D.; Cherepakhin, Alexander V.; Zaitsev, Alexander I.
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Nonlinear photonic crystals of strontium tetra borate: properties and conversion of radiation [Text] / A. Aleksandrovsky, A. Vyunishev [et al.] // SPIE Photonics Europe Conference / SPIE Photonics Europe Conference (2010 ; Apr. ; 12-16 ; Brussels, Belgium). - 2010. - P72

Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Vyunishev, A. M.; Вьюнышев, Андрей Михайлович; Slabko, V. V.; Слабко, Виталий Васильевич; Zaitsev, A. I.; Зайцев, Александр Иванович; SPIE Photonics Europe Conference(2010 ; Apr. ; 12-16 ; Brussels, Belgium)
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    Random quasi-phase-matching in a nonlinear photonic crystal structure of strontium tetraborate / A. S. Aleksandrovsky [et al.] // Phys. Rev. A. - 2008. - Vol. 78, Is. 3. - Ст. 031802, DOI 10.1103/PhysRevA.78.031802. - Cited Reference Count: 20. - Гранты: This work was supported by RFBR Grant No. 02-0700497, Grants of the President of the Russian Federation for the support of leading scientific schools (No. SS-1011.2008.2 and No. SS-3818.2008.3), Grant No. RNP.2.1.1.1814, and the Interdisciplinary Integration project of SB RAS 33. - Финансирующая организация: RFBR [02-0700497]; Russian Federation [SS-1011.2008.2, SS-3818.2008.3, RNP.2.1.1.1814]; SB RAS 33 . - ISSN 1050-2947
Рубрики:
HARMONIC-GENERATION
   DOMAIN-STRUCTURE
Кл.слова (ненормированные):
Alkaline earth metals -- Crystal atomic structure -- Experiments -- Harmonic generation -- Photonic crystals -- Powders -- Random processes -- Strontium -- Angular dependences -- Enhancement factors -- Near ultraviolet -- Photonic Crystal structures -- Quasi phase-matching -- Second-harmonic generation -- Spectral dependences -- Tetra borate -- Crystal structure
Аннотация: Random quasi-phase-matching (RQPM) of the second-harmonic generation process is investigated experimentally and theoretically in a strongly randomized spontaneously grown nonlinear photonic crystal structure of strontium tetraborate. The thickness of domains in the structure is measured and employed in calculations of angular and spectral dependences of random quasi-phase-matching. Despite the great scale of randomness, the RQPM effect is preserved. The calculated enhancement factor due to RQPM is in excellent agreement with experiment, and good agreement between calculations and experiment is obtained for the shape of the angular dependence of RQPM. The calculated spectral dependence of RQPM consists of a number of narrow peaks, and a maximum enhancement factor is attained in the near ultraviolet. The band structure of randomized nonlinear photonic crystal is calculated.

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Держатели документа:
Akademgorodok, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Zaitsev, A. I.; Зайцев, Александр Иванович; Shakhura, I. E. ; Zamkov, A. V.; Замков, Анатолий Васильевич; Vyunishev, A. M.; Вьюнышев, Андрей Михайлович
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Mn–Mn magnetic coupling interaction-induced red emission in a tetra-coordinated lattice / W. Wang, Y. Wei, L. Qiu [et al.] // Chem. Mater. - 2024. - Vol. 36, Is. 11. - P. 5574-5586, DOI 10.1021/acs.chemmater.4c00548. - Cited References: 58. - This work was supported by the National Natural Science Foundation of China (NSFC No. Grants 12374386 and 52072349). We acknowledge Prof Maxim S. Molokeev for the help of Rietveld refinement; his work was supported by the Russian Science Foundation, grant 24-43-00006 . - ISSN 0897-4756. - ISSN 1520-5002
Аннотация: Strong magnetic coupling interactions originating from a short Mn–Mn distance in some heavy Mn2+-doped matrices have important effects on luminescence of single Mn2+ ions and close-knit Mn2+–Mn2+ pairs. However, the intrinsic mechanism of controlling spectral regulation remains elusive since the underlying relationship among Mn–Mn distances, magnetic coupling interactions, and optical properties is unclear. Herein, we create an unusual red emission (620 nm) of Mn2+ in a typical tetra-coordinated lattice of Li2CdGeO4 by simply enhancing the Mn2+-doped level in addition to regular green emission (528 nm). Although the dual emission peaks occupy the same tetra-coordinated crystallographic lattice of CdO4, different temperature-dependent emission behaviors are observed, which expands a possibility in optical thermometry sensors. Detailed Mn–Mn distances are calculated via Rietveld refinement analysis, and their effects on the Mn–Mn coupling interactions are evaluated. Furthermore, the Mn–Mn coupling interaction types are identified through electron spin resonance and magnetic measurements. The continuously decreasing distances between Mn2+ ions strengthen the dipole–dipole coupling effect, resulting in the atypical red emission in a tetra-coordinated lattice environment. These findings elucidate the spectral regulation mechanism from the perspective of magnetic coupling interactions, providing a new pathway to regulate Mn2+-related emission.

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Держатели документа:
Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road , Wuhan 430074, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia

Доп.точки доступа:
Wang, W.; Wei, Y.; Qiu, L.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Yang, H.; Liu, H.; Gao, R.; Guan, M.; Tu, D.; Li, G.
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