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    Complex oxide with negative thermal expansion for producing ceramic matrix composites with invar effect / E. S. Dedova [et al.] // AIP Conf. Proc. - 2016. - Vol. 1783: Advanced materials with hierarchical structure for new technologies and reliable structures 2016. - Ст. 020037, DOI 10.1063/1.4966330. - Cited References: 12. - The research was conducted with partial financial support by an agreement with the Ministry of Education No. 14.575.21.0040 (RFMEFI57514X0040). Authors are grateful to Institute of Physics for their help in the dilatometer investigation.
   Перевод заглавия: Комплексные оксиды с отрицательным тепловым расширением для получения керамических композитов с инварным эффектом
Кл.слова (ненормированные):
ceramics -- zirconium tungstate -- negative thermal expansion coefficient -- phase transformation -- spinel
Аннотация: The article investigates the phase composition of (Al2O3 – 20 wt % ZrO2)–ZrW2O8 ceramic composites obtained by cold-pressing and sintering processes. Using X-ray analysis it has been shown that composites mainly have monoclinic modification of zirconium dioxide and orthorhombic phase of aluminum oxide. After adding zirconium tungstate the phase composition of sintered ceramics changes, followed by the formation of tungsten-aluminates spinel such as Alx(WOy)z. It has been shown that thermal expansion coefficient of material decreases approximatly by 30%, as compared with initial ceramics.

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Доп.точки доступа:
Dedova, E. S.; Pertushina, M. U.; Kondratenko, A. I.; Gorev, M. V.; Горев, Михаил Васильевич; Kulkov, S. N.; International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016(Tomsk)(19-23 Sept. 2016)
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Orientation dependence of superelasticity in quenched high-nickel Ti-51.8Ni single crystals / E. E. Timofeeva, E. Y. Panchenko, A. I. Tagiltsev [et al.] // Mater. Lett. - 2021. - Vol. 282. - Ст. 128677, DOI 10.1016/j.matlet.2020.128677. - Cited References: 12. - This work was supported by the Russian Science Foundation (grant No. 18–19–00298 ). The electron microscopy studies were carried out on the equipment of the Krasnoyarsk Regional Center for Collective Use SB RAS . - ISSN 0167-577X
Кл.слова (ненормированные):
Phase transformation -- Shape memory materials -- Ti-Ni -- Single crystals -- Superelasticity -- Strain-glass
Аннотация: The orientation dependence of the functional and mechanical properties of quenched Ti-51.8at.%Ni single crystals, undergoing a strain-glass transition upon cooling/heating was investigated. It was found that a compressive stress above 800 MPa leads to the B2-B19′ martensitic transformation (MT), regardless of orientation. In the high-strength [0 0 1]-orientation, superelasticity (SE) was observed at 203–248 K, with a reversible strain of 2.3%. Degradation of SE at deforming stresses σ > 1000 MPa was associated with the formation of {1 1 3}B2 twins during the reverse MT. In the low-strength [1 1 1]-orientation, the formation of stress-induced B19′-martensite occurred simultaneously with the plastic deformation of the B2-phase (due to the formation of reorientation bands and dislocation slip) and a reversible strain was not observed.

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Держатели документа:
Tomsk State University, Novosobornaya Square 1, Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Timofeeva, E. E.; Panchenko, E. Y.; Tagiltsev, A. I.; Larchenkova, N. G.; Tokhmetova, A. B.; Chumlyakov, Y. I.; Volochaev, M. N.; Волочаев, Михаил Николаевич
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    Sequential and reversible phase transformations in zero-dimensional organic-inorganic hybrid Sb-based halides towards multiple emissions / B. Li, J. Jin, M. Yin [et al.] // Angew. Chem. Int. Ed. - 2022. - Vol. 61, Is. 49. - Ст. e202212741, DOI 10.1002/anie.202212741. - Cited References: 35. - This work was supported by the National Natural Science Foundation of China (Grants No. 22171040 and 51961145101), and the Fundamental Research Funds for the Central Universities, China (No. N2105006) . - ISSN 1433-7851
   Перевод заглавия: Последовательные и обратимые фазовые превращения в нульмерных органо-неорганических гибридных галогенидах на основе Sb для множественных эмиссий
Кл.слова (ненормированные):
Anti-Counterfeiting -- Luminescence -- Metal Halides -- Phase Transformation
Аннотация: Zero-dimensional (0D) metal halides have drawn increasing attention due to the attractive structure dependent photoluminescence (PL) properties. Here, we report two new 0D organic–inorganic hybrid Sb-based halides, (MTP)6SbBr6Sb2Br9⋅H2O (MTP=Methyltriphenylphosphonium, crystal 1) and (MTP)2SbBr5 (crystal 2), featuring a reversible structural phase transformation and tunable orange and red emissions upon dehydration and rehydration of H2O molecules. Intriguingly, a subsequent heat treatment further enables the formation of glassy state (MTP)2SbBr5 (glass 3) with near-infrared luminescence, moreover, a sequential reverse phase transformation from glass 3 to crystal 2 and 1 is triggered by acetonitrile and water vapor stepwise. The anti-counterfeiting demo based on the tunable and reversible PL switching is finally achieved and thus the phase structure engineering in 0D metal halides expands their multiple applications in optical fields.

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Держатели документа:
Department of Chemistry, College of Sciences, Northeastern University, Liaoning, Shenyang, 110819, China
School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510641, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Li, B.; Jin, J.; Yin, M.; Zhang, X.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.; Xu, Y.
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Chemical pressure as an effective tool for tuning the structural disordering and barocaloric efficiency of complex fluorides (NH4)3MF7 (M: Sn, Ti, Ge, Si) / I. N. Flerov, M. V. Gorev, E. V. Bogdanov, N. M. Laptash // J. Phys. D: Appl. Phys. - 2024. - Vol. 57, Is. 17. - Ст. 175301, DOI 10.1088/1361-6463/ad211b. - Cited References: 39. - The study was supported by a Grant from the Russian Science Foundation No. 23-22-00115, https://rscf.ru/project/23-22-00115/ . - ISSN 0022-3727. - ISSN 1361-6463
Кл.слова (ненормированные):
fluorides -- phase transformation -- phase diagram -- entropy -- pressure -- barocaloric effect
Аннотация: Double fluoride salts (NH4)3M4+F7 (M4+: Sn, Ti, Ge, Si) demonstrate a high efficiency of using chemical pressure as a tool for control and tuning structural ordering/disordering, sensitivity to hydrostatic pressure, successions of the phase transitions, etc and, as a result, for purposeful variation within a wide range of parameters of barocaloric effect (BCE). The conventional and inverse BCEs near the triple points were found on the T − p phase diagrams, combination of which can be used to construct original cooling cycle in narrow temperature and pressure ranges. Reconstructive transformation between two cubic phases, Pm3-m ↔ Pa3-, realized in (NH4)3SnF7 at atmospheric pressure and in (NH4)3TiF7 at p ˃ 0.4 GPa are characterized by rather low thermal hysteresis, δT0 = 1 K, and a great entropy change, ΔSBCE = 110–152 J (kg · K)−1, depending on the size of the central atom. At above 300–350 K, a contribution to BCE associated with the regular thermal expansion of the crystal lattice becomes comparable to entropy and temperature changes under pressure in the region of the phase transitions. An analysis of the absolute, relative and integral barocaloric characteristics of (NH4)3M4+F7 compounds showed their high competitiveness with respect to other barocaloric materials considered as promising solid-state refrigerants.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660074 Krasnoyarsk, Russia
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, 660049 Krasnoyarsk, Russia
Institute of Chemistry, Far Eastern Department of RAS, 690022 Vladivostok, Russia

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Laptash, N. M.
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