Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Michael W, Lufaso"'
Publikováno v:
APL Materials, Vol 6, Iss 8, Pp 086106-086106-8 (2018)
Materials showing negative thermal expansion (NTE) are technologically important and a few transition-metal oxides with the perovskite structure show large NTE-like volume changes due to intermetallic charge transfer. Here we show that the observed v
Externí odkaz:
https://doaj.org/article/6aa3925a2f2e40ff958e77af5cc6ae3c
Publikováno v:
AIP Advances, Vol 4, Iss 8, Pp 087125-087125-10 (2014)
We present an electron diffraction study of three sillenites, Bi12SiO20, Bi25FeO39, and Bi25InO39 synthesized using the solid-state method. We explore a hypothesis, inspired by optical studies in the literature, that suggests that trivalent sillenite
Externí odkaz:
https://doaj.org/article/1ad04961d17d46cdb801de4a1306f8f8
Autor:
Michael W. Lufaso, Xavi Marti, Adeilton Pereira Maciel, Marcos V.S. Rezende, Carlos William de Araujo Paschoal, D. A. B. Barbosa, Helena Reichlova
Publikováno v:
Journal of Alloys and Compounds. 663:899-905
Barium-doped La 2 NiMnO 6 double perovskites have been investigated in order to elucidate the role of the B-site doping on its magnetic, dielectric and vibrational properties. In all cases, we have obtained a non-linear dependence with the Barium con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ff9fcdbf0d5b38d9a534f32058ab3be
https://doi.org/10.1016/j.jallcom.2015.11.099
https://doi.org/10.1016/j.jallcom.2015.11.099
Autor:
Mark W. Meisel, Matthew J. Andrus, Pedro A. Quintero, Daniel R. Talham, T. V. Brinzari, Michael W. Lufaso, Olivia N. Risset
Publikováno v:
Journal of the American Chemical Society. 136:15660-15669
Particles of formula Rb0.24Co[Fe(CN)6]0.74@K0.10Co[Cr(CN)6]0.70·nH2O with a light-responsive rubidium cobalt hexacyanoferrate (RbCoFe) core and a magnetic potassium cobalt hexacyanochromate (KCoCr) shell have been prepared and exhibit light-induced
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d528fb536e29d0c809b81f9a3a4e82c
https://doi.org/10.1021/ja5084283
https://doi.org/10.1021/ja5084283
Autor:
Michael W. Lufaso, Waldeci Paraguassu, M. C. Castro Junior, F M Silva Júnior, Alejandro Ayala, Carlos William de Araujo Paschoal, Zachary R. Kann, Rossana Almeida, R. L. Moreira
Publikováno v:
Vibrational Spectroscopy. 66:43-49
Raman and infrared spectroscopic measurements were performed and combined with lattice dynamics simulations in order to describe the room temperature vibrational properties of the BiMn 2 O 5 mullite ceramic. A total of 13 Raman active modes and 19 in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f21e26189b702309a24a1e0478b13b8
https://doi.org/10.1016/j.vibspec.2013.01.010
https://doi.org/10.1016/j.vibspec.2013.01.010
Autor:
Jeffrey T. Auletta, M. Carvalho Castro, R. X. Silva, Carlos William de Araujo Paschoal, Rossana Almeida, Alejandro Ayala, Michael W. Lufaso
Publikováno v:
Vibrational Spectroscopy. 64:172-177
The Bi2Sn2O7 pyrochlore is known to undergo a sequence of structural phase transitions with an increase in temperature. Raman spectroscopy was employed in the investigation of the temperature dependence of the active phonons in the Raman spectrum. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::286411d58c542fed53815daf9e9cba24
https://doi.org/10.1016/j.vibspec.2012.05.009
https://doi.org/10.1016/j.vibspec.2012.05.009
Autor:
Michael W. Lufaso, Carlos William de Araujo Paschoal, Roberto L. Moreira, E. N. Silva, Alejandro Ayala, A. Nonato
Publikováno v:
Vibrational Spectroscopy. 63:409-417
We have investigated the Raman scattering and infrared active optical phonons in Bi3Fe1/2Nb3/2O9. At room temperature the phonons were assigned according to lattice dynamic calculations performed using the Wilson's FG method. The infrared phonon para
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::abb909994e8ac9963d81617837ca9cad
https://doi.org/10.1016/j.vibspec.2012.09.013
https://doi.org/10.1016/j.vibspec.2012.09.013
Autor:
Michael W. Lufaso, N Florida, Patricia E. Kalita, Kristina Lipinska, Koln, CIW, Zachary R. Kann, Hartmut Schneider, Stanislav V. Sinogeikin, Andrew Cornelius, Oliver Hemmers
Publikováno v:
International Journal of Materials Research. 103:464-468
Single phased mullite-type Bi2Fe4 – x Mn x O10 – δ mixed crystals (0.25 ≤ x ≤ 3.125) and the end-member Bi2Fe4O9, synthesized from the oxides by reaction sintering up to 825°C, were studied at high-pressures in order to probe their high-pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c0fd1ff710c42063159142a3164bdbe
https://doi.org/10.3139/146.110719
https://doi.org/10.3139/146.110719
Autor:
João Elias Figuereido Soares Rodrigues, E. N. Silva, Carlos William de Araujo Paschoal, Kathryn A. Mince, Michael W. Lufaso
Publikováno v:
Materials Research Bulletin. 47:878-882
Impedance spectroscopy analysis of the dielectric properties of a Ba2BiTaO6 ceramic was performed in the temperature range from room temperature to 500 K. The sample was prepared using conventional solid state synthesis under air and the X-ray diffra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7744a3c225d45315836c8b157346277c
https://doi.org/10.1016/j.materresbull.2011.11.036
https://doi.org/10.1016/j.materresbull.2011.11.036
Autor:
Rafael M. Almeida, Carlos William de Araujo Paschoal, Zachary R. Kann, Michael W. Lufaso, Jeffrey T. Auletta
Publikováno v:
Ceramics International. 38:1275-1279
Impedance spectroscopy measurements, in the temperature range from room temperature to 600 K, were performed in order to investigate the dielectric and ionic properties of Bi 2 Sn 2 O 7 ceramics. The results show that the conductivity in this pyrochl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5bde9b5e4c9cc742fa4a4755814bbd5c
https://doi.org/10.1016/j.ceramint.2011.08.060
https://doi.org/10.1016/j.ceramint.2011.08.060