Zobrazeno 1 - 10
of 156
pro vyhledávání: '"Igor N. Flerov"'
Publikováno v:
Scripta Materialia. 191:149-154
We report the influence of anisotropy and texture on elasto(ElCE)- and baro(BCE)-caloric effects in single-crystal and ceramic (NH4)2SO4. Inverse extensive and intensive ElCE in ceramics, (ΔSElCE)cer = 87 J/kg·K; ΔTAD = - 11.6 K), as well as in a
Autor:
Mikhail V. Gorev, Igor N. Flerov
Publikováno v:
Ferroelectrics. 567:1-12
We performed an analysis of the phase diagrams and piezocaloric properties of fluorine–oxygen ferroics (NH4)2MeOxF6-x (Me: W, Mo, Nb; x: 1, 2) with orthorhombic symmetry. The nature of the influenc...
Autor:
Igor N. Flerov, E. I. Pogorel’tsev, Andrey V. Kartashev, N. M. Laptash, M. S. Molokeev, E. V. Bogdanov, M. V. Gorev, Svetlana V. Melnikova
Publikováno v:
Physics of the Solid State. 62:1271-1279
The (NH4)3VOF5 crystals have been synthesized and their homogeneity and single-phase structure has been established by the X-ray diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy studies. The investigations of the temp
Autor:
Ekaterina A. Mikhaleva, Mikhail V. Gorev, Vitaliy S. Bondarev, Maxim S. Molokeev, Alexsander I. Zaitsev, Ivan V. Nemtsev, Alexander V. Fokin, Igor N. Flerov
Publikováno v:
Journal of Non-Crystalline Solids. 597:121935
Publikováno v:
Journal of Alloys and Compounds. 806:1047-1051
In this study, the conventional and inverse barocaloric effects (BCE) in ferroelectric NH4HSO4 are reported. Maximum extensive and intensive BCE near order–disorder phase transition can be achieved at low pressure p ≤ 0.1 GPa. Large thermal expan
Autor:
Mikhail V. Gorev, V. S. Bondarev, L. N. Korotkov, L. S. Stekleneva, O. I. Sysoev, E. A. Mikhaleva, Maxim S. Molokeev, Ewa Rysiakiewicz-Pasek, Igor N. Flerov
Publikováno v:
Bulletin of the Russian Academy of Sciences: Physics. 83:1072-1076
Results are presented from studying the X-ray diffraction, heat capacities, dielectric permittivities, and coefficients of the volumetric thermal expansion of composite materials obtained by embedding of Rb2ZnCl4 salt into the porous matrices of boro
Publikováno v:
Journal of Solid State Chemistry. 277:376-380
New fluoride compound (NH4)2KZrF7 with the elpasolite structure (sp. gr. Fm-3m) was synthesized by partial cationic substitution in (NH4)3ZrF7 cryolite. Due to small difference in ionic radii of K+ and NH4+, non-equivalent crystallographic positions
Heat capacity, thermal expansion and barocaloric effect in fluoride $$\hbox {K}_{2}\hbox {TaF}_{7}$$
Publikováno v:
Journal of Materials Science. 54:14287-14295
The heat capacity and thermal expansion of potassium heptafluorotantalate were studied. The room temperature phase $$P2_1/c$$ is stable at least to 4 K. The strong first-order phase transition $$P2_1/c - Pnma$$ at $$T_0=486.2\,\hbox {K}$$ is accompan
Autor:
Evgeniy V. Bogdanov, Andrey V. Kartashev, Natalia M. Laptash, Igor N. Flerov, E. I. Pogorel’tsev, Mikhail V. Gorev
Publikováno v:
Journal of Solid State Chemistry. 276:152-158
Heat capacity, thermal dilatation, permittivity and sensitivity to external pressure of ( NH 4 ) 3 SiF 7 were studied. Due to the absence of cubic phases P m 3 ¯ m and P a 3 ¯ , a strong decrease in the total entropy change ∑ Δ S i = 19 J/mol K
Autor:
Maxim S. Molokeev, Evgeniy V. Bogdanov, Igor N. Flerov, Svetlana V. Melnikova, Natalia M. Laptash
Publikováno v:
Journal of Fluorine Chemistry. :75-80
Optical and calorimetric experiments on K2TaF7 are performed in a wide temperature range. No features were found in the behavior of the birefringence Δnb(T), the angle of rotation of the indicatrix ϕ(T) and the heat capacity ΔCp(T) except for thos