7 documents found, page 1 of 1
Cluster spin glass behaviour of Co2+−Al3+ layered double hydroxides
Fertman, E.L.; Fedorchenko, A.V.; Čižmár, E.; Pashkevich, Yu.G.; Holub, M.; Tkáč, V.; Tarasenko, R.; Feher, A.; Neves, C.S.; Vieira, D E L; Salak, A.N.Frequency-dependent magnetic behaviour of cobalt-aluminium layered double hydroxides (LDH) with the Co/Al ratio of 2 and 3, was studied between 2 and 300 K. It was found from analysis of the temperature-dependent ac magnetic susceptibility that these LDH exhibit a magnetic cluster spin glass behaviour regardless of their basal spacing value and the Co/Al ratio as evidenced by EA/kBT0 > 1 relation obtained using...
Combined effect of 2D nature and structural glass behaviour and true magnetic c...
Tkáč, V.; Pashkevich, Yu.G.; Fertman, E.L.; Tarasenko, R.; Čižmár, E.; Feher, A.; Fedorchenko, A.V.; Neves, C.S.; Vieira, D.E.L.; Salak, A.N.Heat capacity of cobalt-aluminium and magnesium-aluminium layered double hydroxides (LDH) with the divalent-to-trivalent cations ratio (n) of 2 and 3, and intercalated with NO3 − , CO3 2− and OH− , was measured as a function of temperature between 2 and 100 K. Magnetic contribution to the heat capacity (Cmag) of ConAl LDH was extracted from comparison of the C(T) dependences with the respective reduced dependen...
Magnetic ordering in Co2+-containing layered double hydroxides via the low-temp...
Pashkevich, Yu.G.; Fertman, E.L.; Fedorchenko, A.V.; Vieira, D. E. L.; Neves, C. S.; Babkin, R.Yu.; Lyogenkaya, A.А.; Tarasenko, R.; Tkáč, V.The low-temperature heat capacity and the magnetisation of Co2+ n Al3+ layered double hydroxides (LDH) with the cobalt-to-aluminium ratio n = 2 and 3 and intercalated with different anions have been studied in a wide range of magnetic fields up to 50 kOe. The heat capacity, C(T), was found to demonstrate a Schottky-like anomaly observed as a broad local maximum in the temperature dependence below 10 K. The effe...
The phenomenon of conversion polymorphism in Bi-containing metastable perovskites
Khalyavin, D.D.; Salak, A.N.; Fertman, E.L.; Kotlyar, O.V..; Eardley, E.; Olekhnovich, N.M.; Pushkarev, A.V.; Radyush, Yu.V.; Fedorchenko, A.V.A post-synthesis thermal treatment of metastable phases in the high-pressure stabilised perovskite BiFe1-yScyO3 system results in the irreversible formation of polymorphs which represent novel polar and antipolar structures with interesting magnetic properties. Such annealing-stimulated polymorphism is believed to be a general phenomenon which can be found in other systems.
Unusual magnetic properties of the polar orthorhombic BiFe0.5Sc0.5O3 perovskite
Fedorchenko, A.V.; Fertman, E.L.; Salak, A.N.; Desnenko, V.A.; Čižmár, E.; Feher, A.; Vaisburd, A.I.; Olekhnovich, N.M.; Pushkarev, A.V.; Radyush, Yu.V.
Multiferroic Bi 0.65 La 0.35 Fe 0.5 Sc 0.5 O 3 perovskite: magnetic and thermod...
Fertman, E.L.; Fedorchenko, A. V.; Khalyavin, D. D.; Salak, A. N.; Baran, A.; Desnenko, V. A.; Kotlyar, O. V.; Čižmár, E.; Feher, A.; Syrkin, E. S.Magnetic and thermodynamic properties of polycrystalline multiferroic Bi0.65La0.35Fe0.5Sc0.5O3 synthesized under high-pressure and high-temperature conditions are reported. Magnetic properties were studied using a SQUID magnetometer technique over the temperature range of 5−300 K in magnetic fields up to H=10 kOe. The field dependent magnetization M(H) was measured in magnetic fields up to 50 kOe at different t...
Magnetic properties of the Bi0.65La0.35Fe0.5Sc0.5O3 perovskite
Fedorchenko, A.V.; Fertman, E.L.; Desnenko, V.A.; Kotlyar, O.V.; Čižmár, E.; Shvartsman, V.V.; Lupascu, D.C.; Salamon, S.; Wende, H.; Salak, A.N.Magnetic properties of polycrystalline multiferroic Bi0.65La0.35Fe0.5Sc0.5O3 synthesized under high-pressure (6 GPa) and high-temperature (1500 K) conditions were studied using a SQUID magnetometer technique. The temperature dependent static magnetic moment M was measured in both zero-field-cooled and field-cooled modes over the temperature range of 5-300 K in low magnetic field H = 0.02 kOe. The field dependen...