Search Results - "COELHO, Adelino A"

Magnetization studies of binary and ternary Co-rich phases of the Co–Si–B system by Bormio-Nunes, Cristina, Nunes, Carlos Angelo, Coelho, Adelino A., Faria, Maria Ismênia Sodero Toledo, Suzuki, Paulo Atsushi, Coelho, Gilberto Carvalho

“…[Display omitted] ▶ Co 5Si 2B phase was found to be paramagnetic, while Fe 5SiB 2 and Mn 5SiB 2 are ferromagnetic. ▶ Ferromagnetic Co 2B phase showed…”
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Magnetic characterization of Mn5SiB2 and Mn5Si3 phases by DE ALMEIDA, Daniel Martins, BORMIO-NUNES, Cristina, NUNES, Carlos Angelo, COELHO, Adelino A, CARVALHO COELHO, Gilberto

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Magnetic properties of Mn3-xFexSn compounds with tuneable Curie temperature by Fe content for thermomagnetic motors by Felez, Marissol R., Coelho, Adelino A., Gama, Sergio

“…•This paper reports a magnetic material designed to cascade thermomagnetic motors.•Mn3-xFexSn can have their magnetic TC,T tuned linearly by controlling the…”
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A General Approach to First Order Phase Transitions and the Anomalous Behavior of Coexisting Phases in the Magnetic Case by Gama, Sergio, de Campos, Ariana, Coelho, Adelino A., Alves, Cleber S., Ren, Yang, Garcia, Flávio, Brown, Dennis E., da Silva, Luzeli M., Carvalho, A. Magnus G., Gandra, Flávio C. G., dos Santos, Adenilson O., Cardoso, Lisandro P., von Ranke, Pedro J.

“…First order phase transitions for materials with exotic properties are usually believed to happen at fixed values of the intensive parameters (such as…”
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Ambient pressure colossal magnetocaloric effect tuned by composition in Mn1-xFexAs by de Campos, Ariana, Rocco, Daniel L, Carvalho, Alexandre Magnus G, Caron, Luana, Coelho, Adelino A, Gama, Sergio, da Silva, Luzeli M, Gandra, Flávio C G, dos Santos, Adenilson O, Cardoso, Lisandro P, von Ranke, Pedro J, de Oliveira, Nilson A

“…The magnetocaloric effect (MCE) is the basis for magnetic refrigeration, and can replace conventional gas compression technology due to its superior efficiency…”
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Pressure-induced colossal magnetocaloric effect in MnAs by GAMA, Sergio, COELHO, Adelino A, DE CAMPOS, Ariana, CARVALHO, A. Magnus G, GANDRA, Flavio C. G, VON RANKE, Pedro J, DE OLIVEIRA, Nilson A

“…To present day, the maximum magnetocaloric effect (MCE) at room temperature for a magnetic field change of 5 T is 40 J/(kg K) for MnAs. In this Letter we…”
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Analytic and Experimental Analysis of Magnetic Force Equations by Gama, Sergio, Ferreira, Lucas D. R., Bessa, Carlos V. X., Horikawa, Oswaldo, Coelho, Adelino A., Gandra, Flavio C., Araujo, Raul, Egolf, Peter W.

“…The design of magnetic devices requires a precise estimation of magnetic forces. In previous works, we presented a general approach to estimate these forces…”
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Colossal intrinsic magnetoelectric effect in Pb(Fe2/3W1/3)0.83Ti0.17O3 by Fraygola, B, Coelho, Adelino A, Garcia, D, Eiras, J A

“…Dielectric and magnetic properties were investigated in Pb(Fe2/3W1/3)0.83Ti0.17O3 ceramics. The dielectric constant in these samples exhibits colossal changes…”
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Fe valence fluctuations and magnetoelastic coupling in Pb-based multiferroics perovskites by Fraygola, Barbara, Mesquita, Alexandre, Coelho, Adelino A., Garcia, Ducinei, Mastelaro, Valmor R., Eiras, Jose A.

“…Lead‐based multiferroics perovskites with nominal compositions Pb(Fe1/2Nb1/2)O3 and Pb(Fe2/3W1/3)O3 were synthesized following a two‐stage method. Magnetic…”
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Evidence of new magnetic ordering at high temperatures in Pb-based multiferroics perovskites by Fraygola, Barbara, Nascimento, William J., Coelho, Adelino A., Garcia, Ducinei, Eiras, Jose A.

“…Presented here are the results of magnetic data that reveal that both Pb‐based perovskites samples, Pb(Fe1/2Nb1/2)O3 (lead iron niobate – PFN) and…”
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Effect of the synthesis atmosphere on the magnetic and structural properties of TbMnO3 multiferroic polycrystals by Dias, Gustavo S., Silveira, Luiz Gustavo D., Cótica, Luiz F., Santos, Ivair A., Coelho, Adelino A., Garcia, Ducinei, Eiras, José A., Sampaio, Juraci A.

“…Nanostructured orthorhombic TbMnO3 polycrystals were synthesized by high-energy ball milling and annealing in Ar or O2 atmospheres. Oxygen annealed samples…”
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Analysis of the crystallographic and magnetic structures of the Tb0.1Pr0.9Al2 and Tb0.25Pr0.75Al2 magnetocaloric compounds by means of neutron scattering by Tedesco, Julio C. G., Carvalho, Alexandre Magnus G., Christensen, Niels Bech, Kockelmann, Winfried, Telling, Mark T. F., Yokaichiya, Fabiano, Többens, Daniel M., Simeoni, Giovanna G., Cardoso, Lisandro P., Coelho, Adelino A., Bordallo, Heloisa N.

“…Neutron powder diffraction and inelastic neutron scattering data were used to simulate and understand the magnetization and heat capacity curves of the…”
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Ambient pressure colossal magnetocaloric effect tuned by composition in Mn1−xFexAs by de Campos, Ariana, Rocco, Daniel L, Carvalho, Alexandre Magnus G., Caron, Luana, Coelho, Adelino A., Gama, Sergio, da Silva, Luzeli M., Gandra, Flávio C. G., dos Santos, Adenilson O., Cardoso, Lisandro P., von Ranke, Pedro J., de Oliveira, Nilson A.

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Magnetic characterization of Mn 5SiB 2 and Mn 5Si 3 phases by de Almeida, Daniel Martins, Bormio-Nunes, Cristina, Nunes, Carlos Angelo, Coelho, Adelino A., Coelho, Gilberto Carvalho

“…In this work the Mn 5Si 3 and Mn 5SiB 2 phases were produced via arc melting and heat treatment at 1000 °C for 50 h under argon. A detailed microstructure…”
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Dielectric study at microwave frequencies of phase transitions in multiferroic ceramics by Fraygola, B, Coelho, A A, Eiras, J A

“…Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O3 (PFW) and "normal" ferroelectric PbTiO3 (PT) - PFW-PT were synthesised…”
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Magnetoelectric Contribution to Magnetoelastic Coupling in Pb(Fe1/2Nb1/2)O3 Multiferroics Ceramics by Fraygola, B., Frizon, N., Lente, M. H., Coelho, Adelino A., Garcia, D., Eiras, J. A.

“…In this work, electrical permittivity, magnetic and anelastic measurements in lead iron niobate ceramics (PFN) were performed in the frequency and temperature…”
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Tunable magnetocaloric effect around room temperature by Fe doping in Mn0.98Cr(0.02-x)Fex As compound by Ipus, Jhon J, Ribeiro, Paula O, von Ranke, P, Vivas, RJ Caraballo, Carvalho, Alexandre MG, Coelho, Adelino A, Franco, Victorino, Rocco, Daniel L

“…In this work, we present an investigation of the magnetic and magnetocaloric properties of Mn0.98Cr(0.02-x)FexAs compounds with x = 0.002, 0.005 and 0.010. Our…”
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Tunable magnetocaloric effect around room temperature by Fe doping in Mn 0.98 Cr ( 0.02 - x ) Fe x As compound by Ipus, Jhon J., Ribeiro, Paula O., von Ranke, P., Caraballo Vivas, R.J., Carvalho, Alexandre M.G., Coelho, Adelino A., Franco, Victorino, Rocco, Daniel L.

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Colossal intrinsic magnetoelectric effect in Pb(Fe 2/3 W 1/3 ) 0.83 Ti 0.17 O 3 by Fraygola, B., Coelho, Adelino A., Garcia, D., Eiras, J. A.

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Tunable magnetocaloric effect around room temperature by Fe doping in Mn0.98Cr(0.02-x)FexAs compound by Ipus, Jhon J., Ribeiro, Paula O., von Ranke, P., Caraballo Vivas, R.J., Carvalho, Alexandre M.G., Coelho, Adelino A., Franco, Victorino, Rocco, Daniel L.

“…•Realistic values from the MCE of the MnAs-type compounds were determined.•δTFWHM of 33K was found for a simulated composite formed by our samples.•A…”
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