Structural and magnetic properties of nanostructured composites (SrFe<inf>12</inf>O<inf>19</inf>)<inf>x</inf>(CaCu<inf>3</inf>Ti<inf>4</inf>O<inf>12</inf>)<inf>1-x</inf>

© 2017 Elsevier B.V. (SrFe 12 O 19 ) x (CaCu 3 Ti 4 O 12 ) 1-x (x = 0.01, 0.03, 0.07, 0.1) composites were synthesized using a solid state method, while the pre-synthesized strontium hexaferrite SrFe 12 O 19 (SFO) was added to the stoichiometric amount of CaO, CuO and TiO oxides to form the CaCu 3 Ti 4 O 12 (CCTO) structure around SFO microinclusions. The structural and microstructural properties of obtained composites were studied by X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The magnetic properties were studied by electron spin resonance and magnetometry methods. Based on all experimental data we can conclude, that SFO x CCTO 1-x nanostructured composites were formed only for concentrations x = 0.03 and x = 0.07, where SFO nanoinclusions are inside CCTO matrix, that leads to the strong mutual influence of the magnetic properties of both component

Structural and magnetic properties of nanostructured composites (SrFe<inf>12</inf>O<inf>19</inf>)<inf>x</inf>(CaCu<inf>3</inf>Ti<inf>4</inf>O<inf>12</inf>)<inf>1-x</inf>

© 2017 Elsevier B.V. (SrFe 12 O 19 ) x (CaCu 3 Ti 4 O 12 ) 1-x (x = 0.01, 0.03, 0.07, 0.1) composites were synthesized using a solid state method, while the pre-synthesized strontium hexaferrite SrFe 12 O 19 (SFO) was added to the stoichiometric amount of CaO, CuO and TiO oxides to form the CaCu 3 Ti 4 O 12 (CCTO) structure around SFO microinclusions. The structural and microstructural properties of obtained composites were studied by X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The magnetic properties were studied by electron spin resonance and magnetometry methods. Based on all experimental data we can conclude, that SFO x CCTO 1-x nanostructured composites were formed only for concentrations x = 0.03 and x = 0.07, where SFO nanoinclusions are inside CCTO matrix, that leads to the strong mutual influence of the magnetic properties of both component

Magnetic and magnetocaloric properties of (1 − x)La<inf>0.7</inf>Sr<inf>0.3</inf>MnO<inf>3</inf>/xNaF composites

© 2018 Elsevier B.V. (1 − x)La0.7Sr0.3MnO3/xNaF (x = 0.05, 0.15, 0.2) composites were synthesized by the conventional solid-state synthesis route, while the sodium fluoride NaF was added to the stoichiometric amount of La2O3, SrCO3 and Mn2O3, that allowed to reduce the synthesis temperature of composites in respect to the pure lanthanum strontium manganite. The phase purity and microstructures of composites were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Magnetocaloric effect was investigated by means of field dependence magnetization measurements. The significant affect of the additive NaF to the final size and morphology of (1 − x)La0.7Sr0.3MnO3/xNaF composite samples was observed. Though the high-concentration samples (x = 0.15, 0.2) exhibit the lower magnetic entropy changes ΔSM in respect to the pure La0.7Sr0.3MnO3, the expanded temperature dependence of ΔSM curves leads to the slightly higher values of the relative cooling power

Magnetic and magnetocaloric properties of (1 − x)La<inf>0.7</inf>Sr<inf>0.3</inf>MnO<inf>3</inf>/xNaF composites

© 2018 Elsevier B.V. (1 − x)La0.7Sr0.3MnO3/xNaF (x = 0.05, 0.15, 0.2) composites were synthesized by the conventional solid-state synthesis route, while the sodium fluoride NaF was added to the stoichiometric amount of La2O3, SrCO3 and Mn2O3, that allowed to reduce the synthesis temperature of composites in respect to the pure lanthanum strontium manganite. The phase purity and microstructures of composites were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Magnetocaloric effect was investigated by means of field dependence magnetization measurements. The significant affect of the additive NaF to the final size and morphology of (1 − x)La0.7Sr0.3MnO3/xNaF composite samples was observed. Though the high-concentration samples (x = 0.15, 0.2) exhibit the lower magnetic entropy changes ΔSM in respect to the pure La0.7Sr0.3MnO3, the expanded temperature dependence of ΔSM curves leads to the slightly higher values of the relative cooling power

Structural and magnetic properties of nanostructured composites (SrFe<inf>12</inf>O<inf>19</inf>)<inf>x</inf>(CaCu<inf>3</inf>Ti<inf>4</inf>O<inf>12</inf>)<inf>1-x</inf>

© 2017 Elsevier B.V. (SrFe 12 O 19 ) x (CaCu 3 Ti 4 O 12 ) 1-x (x = 0.01, 0.03, 0.07, 0.1) composites were synthesized using a solid state method, while the pre-synthesized strontium hexaferrite SrFe 12 O 19 (SFO) was added to the stoichiometric amount of CaO, CuO and TiO oxides to form the CaCu 3 Ti 4 O 12 (CCTO) structure around SFO microinclusions. The structural and microstructural properties of obtained composites were studied by X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The magnetic properties were studied by electron spin resonance and magnetometry methods. Based on all experimental data we can conclude, that SFO x CCTO 1-x nanostructured composites were formed only for concentrations x = 0.03 and x = 0.07, where SFO nanoinclusions are inside CCTO matrix, that leads to the strong mutual influence of the magnetic properties of both component

Structural and magnetic properties of nanostructured composites (SrFe<inf>12</inf>O<inf>19</inf>)<inf>x</inf>(CaCu<inf>3</inf>Ti<inf>4</inf>O<inf>12</inf>)<inf>1-x</inf>

© 2017 Elsevier B.V. (SrFe 12 O 19 ) x (CaCu 3 Ti 4 O 12 ) 1-x (x = 0.01, 0.03, 0.07, 0.1) composites were synthesized using a solid state method, while the pre-synthesized strontium hexaferrite SrFe 12 O 19 (SFO) was added to the stoichiometric amount of CaO, CuO and TiO oxides to form the CaCu 3 Ti 4 O 12 (CCTO) structure around SFO microinclusions. The structural and microstructural properties of obtained composites were studied by X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The magnetic properties were studied by electron spin resonance and magnetometry methods. Based on all experimental data we can conclude, that SFO x CCTO 1-x nanostructured composites were formed only for concentrations x = 0.03 and x = 0.07, where SFO nanoinclusions are inside CCTO matrix, that leads to the strong mutual influence of the magnetic properties of both component