5 documents found, page 1 of 1
Intermediate structural state in Bi1−xPrxFeO3 ceramics at the rhombohedral–orth...
Karpinsky D.V.; Troyanchuk, I. O.; Willinger, M.; Khomchenko, V. A.; Salak, A. N.; Sikolenko, V.; Silibin, M. V.Crystal structure of the Bi1−xPrxFeO3 ceramics of the compositions corresponding to the threshold concentrations separating the polar rhombohedral (R3c) and anti-polar orthorhombic (Pbam) phases has been investigated with X-ray diffraction, transmission electron microscopy and differential scanning calorimetry measurements performed in a broad temperature range. The structural study specifies the peculiarities ...
Phase coexistence in Bi1-xPrxFeO3 ceramics
Karpinsky, D. V.; Troyanchuk, I. O.; Sikolenko, V.; Efimov, V.; Efimova, E.; Willinger, M.; Salak, A. N.; Kholkin, A. L.Bi1-x Pr (x) FeO3 ceramics across the rhombohedral-orthorhombic phase boundary have been studied by X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. The structural phase transitions in Bi1-x Pr (x) FeO3 driven by doping concentration and temperature are significantly different from those in BiFeO3 compounds doped with other rare-earth elements. The features of the stru...
Strain induced enhanced ferromagnetic behavior in inhomogeneous low doped La0.9...
Das, S.; Amaral, J. S.; De, K.; Willinger, M.; Gonçalves, J. N.; Roy, A.; Dhak, P.; Giri, S.; Majumder, S.; Silva, Carlos J. R.; Gomes, M. J. M.We report an unusual high-temperature ferromagnetic transition in bulk single-phase nanocrystalline La0.95Sr0.05MnO3þd, achieved through localized strain and inhomogeneous Sr-doping. Magnetization measurements show a well defined transition at 290 K and a broad one at 150 K. HRTEM imaging reveals the strain on the highly crystalline nanometer sized grains and Sr-doping gradients, while oxygen homogeneity at the...
Strain induced enhanced ferromagnetic behavior in inhomogeneous low doped La0.9...
Das, S.; Amaral, J. S.; De, K.; Willinger, M.; Goncalves, J. N.; Roy, A.; Dhak, P.; Giri, S.; Majumder, S.; Silva, C. J. R.; Gomes, M. J. M.We report an unusual high-temperature ferromagnetic transition in bulk single-phase nanocrystalline La0.95Sr0.05MnO3+delta, achieved through localized strain and inhomogeneous Sr-doping. Magnetization measurements show a well defined transition at 290K and a broad one at similar to 150 K. HRTEM imaging reveals the strain on the highly crystalline nanometer sized grains and Sr-doping gradients, while oxygen homo...
Enhanced ferromagnetism and glassy state in phase separated La0.95Sr0.05MnO3 + δ
De, K.; Das, S.; Roy, A.; Dhak, P.; Willinger, M.; Amaral, J. S.; Amaral, V. S.; Giri, S.; Majumder, S.; Silva, Carlos J. R.; Gomes, M. J. M.Unusual high temperature ferromagentism is reported for La0.95Sr0.05MnO3+δ with Curie temperatures (TC1 and TC2) TC1 at 290 K and TC2 ∼ 150 K. Weak antiferromagnetism (AFM) is thought to give low moment, low temperature irreversibility, and non-saturation up to 10 T at 5 K. A short-range ferromagnetism is predicted from well-defined hysteresis at 5 K and field-cooled (FC) magnetization curves. Strong irreversib...