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Research of features magnetic permeability and domain structures in Fe 2O3:GA crystals near the morin transition / A. V. Chzhan [et al.] // Solid State Phenomena. - 2009. - Vol. 152-153. - P29-32, DOI 10.4028/www.scientific.net/SSP.152-153.29 . - ISSN 1012-0394
Кл.слова (ненормированные):
Antiferromagnetic -- Domain structure -- Hematite -- Morin transition -- Weakly ferromagnetic -- Antiferromagnetic materials -- Antiferromagnetism -- Capillarity -- Crystal impurities -- Crystals -- Ferromagnetic materials -- Ferromagnetic resonance -- Ferromagnetism -- Gallium -- Hematite -- Iron ores -- Magnetic permeability -- Oxide minerals -- Permanent magnets -- Antiferromagnetism -- Crystal impurities -- Ferromagnetic materials -- Ferromagnetism -- Gallium -- Hematite -- Iron compounds -- Magnetic materials -- Magnetic permeability -- Magnetism -- AFM -- Antiferromagnetic -- Antiferromagnetic domains -- Antiferromagnetics -- Basal planes -- Domain configurations -- Domain structure -- Morin transitions -- Multi-layered structure -- Weakly ferromagnetic -- Magnetic domains -- Magnetic domains
Аннотация: Specially picked up web-chamber is used for visualization of domain structure in hematite. An analysis of domain configuration shows, that domain structure of hematite in a basal plane represents multilayered structure which contains domains both in paralleled thickness and in the parallel basal planes. The temperature features of magnetic permeability and domain structures in Fe2O3:Ga crystals near the Morin transition are investigated. Observable changes of magnetic permeability and changes in domain structure confirm that transition from AFM to WFM occurs in the hematite with Ga impurity as transition of the first sort. Results of research of antiferromagnetic and weakly ferromagnetic resonances (AFMR and WFMR) in these compounds are presented.

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Держатели документа:
Kirenskii Institute of Physics, Siberian Branch of RAS, Institute of Physics, Krasnoyarsk 660036Academgorodok, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Chzhan, A.V.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Isaeva, T. N.; Patrin, G. S.; Патрин, Геннадий Семёнович; Moscow International Symposium on Magnetism(4 ; 2008 ; Jun. ; Moscow)
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Spontaneous imbibition experiments for enhanced oil recovery with silica nanosols / M. I. Pryazhnikov, V. A. Zhigarev, A. V. Minakov, I. V. Nemtsev // Capillarity. - 2024. - Vol. 10, Is. 3. - P. 73-86, DOI 10.46690/capi.2024.03.02. - Cited References: 53. - This work is partially financed by Ministry of Science and Higher Education of the Russian Federation (No. FSRZ2020-0012) . - ISSN 2709-2119. - ISSN 2652-3310
Кл.слова (ненормированные):
Spontaneous imbibition -- enhanced oil recovery -- silica nanosols -- wettability -- interfacial tension
Аннотация: Experimental oil displacement as a result of spontaneous imbibition of silica nanosols has been carried out using two types of sandstone as the reservoir rock. The permeability of the cores ranged from 0.34 to 333 mD, while the porosity was 11% and 22%, respectively. During the research, the influence of the concentration and nanoparticle size, as well as the permeability of the rock, on the process of spontaneous imbibition, was studied. Silica nanosols were considered as an object of study. The nanoparticle size ranged from 10 to 35 nm. The mass concentration of nanoparticles varied from 0.01% to 0.25%. It was found that the use of silica nanosols significantly increases the rate of the spontaneous imbibition process. It was established that a silica nanosol with a nanoparticle size of 10 nm and a concentration of 0.25% allows to displace more than six times oil compared to the reservoir water model in the same time. As a result, it was shown that the oil displacement efficiency and the efficiency of spontaneous imbibition increase along with an increase in the nanoparticle concentration and a decrease in the nanoparticle size.

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Держатели документа:
Laboratory of Physical and Chemical Technologies for the Development of Hard-to-Recover Hydrocarbon Reserve, Siberian Federal University, Krasnoyarsk 660041, Russia
Laboratory of Heat Exchange Control in Phase and Chemical Transformations, Kutateladze Institute of Thermophysics, SB RAS, Novosibirsk 630090, Russia
Department of Molecular Electronics, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk 660036, Russia
Laboratory of molecular spectroscopy, L.V. Kirensky Institute of Physics, SB RAS, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Pryazhnikov, M. I.; Zhigarev, V. A.; Minakov, A. V.; Nemtsev, I. V.; Немцев, Иван Васильевич
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