Zobrazeno 1 - 10
of 2 035
pro vyhledávání: '"Carvalho, H"'
Autor:
Gratens, X., Silva, B. de Abreu, Bernardi, M. I. B., de Carvalho, H. B., Franco Jr, A., Chitta, V. A.
The magnetization of Zn1-xCoxO (0.0055 < x < 0.073) nanoparticles has been measured as a function of temperature T (1.7 K < T , 10 K) and for magnetic field up to 65 kOe using a SQUID magnetometer. Samples were synthesized by three different growth m
Externí odkaz:
http://arxiv.org/abs/2205.06213
In this report we present a systematic study on the preparation of Co:ZnO ceramics via standard solid-state route from different Co precursors (Co3O4, CoO and metallic Co) and atmospheres (O2 and Ar). Particular emphasis was done on the defect chemis
Externí odkaz:
http://arxiv.org/abs/2203.02344
Autor:
Ferreira, M. P., de Carvalho, H. B.
The efforts in the optimization of the physical and chemical properties related to the photocatalytic efficiency of TiO2 nanoparticles relies mainly on defect engineering strategies, been the structural and the doping the most common ones. The doping
Externí odkaz:
http://arxiv.org/abs/2203.02322
Publikováno v:
In Engineering Structures 15 April 2024 305
Autor:
Lage, V. M. Almeida, da Silva, R. T., Mesquita, A., de Godoy, M. P. F., Gratens, X., Chitta, d V. A., de Carvalho, H. B.
Publikováno v:
Journal of Alloys and Compounds 863 (2021) 158320
Polycrystalline bulk Mn:ZnO ceramics with Mn nominal concentrations of 6, 11, 17 and 22 at.% were prepared trough solid-state reaction method and subjected to a heat treatment in reducing atmosphere (Ar (95%) and H2 (5%)). The samples were studied wi
Externí odkaz:
http://arxiv.org/abs/2009.14778
Autor:
de Godoy, M. P. F., Gratens, X., Chitta, V. A., Mesquita, A., Lima Jr., M. M de, Cantarero, A., Rahman, G., Morbec, J. M., de Carvalho, H. B.
Publikováno v:
Journal of Alloys and Compounds 859 (2021) 157772
The nature of the often reported room temperature ferromagnetism in transition metal doped oxides is still a matter of huge debate. Herein we report on room temperature ferromagnetism in high quality Co-doped ZnO (Zn1-xCoxO) bulk samples synthesized
Externí odkaz:
http://arxiv.org/abs/2007.14140
Publikováno v:
In Structures November 2023 57
Akademický článek
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Akademický článek
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Autor:
CARVALHO, H. I. S.
Publikováno v:
Repositório Institucional da UFESUniversidade Federal do Espírito SantoUFES.
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Este estudo apresenta como objetiv
Este estudo apresenta como objetiv
Externí odkaz:
http://repositorio.ufes.br/handle/10/7257