Výsledky vyhledávání - "A. I. C. Persiano"

Hydroxycalciomicrolite, Ca1.5Ta2O6(OH), a new member of the microlite group from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil

Autor: Robert T. Downs, Nikita V. Chukanov, Javier Ellena, A. I. C. Persiano, Daniel Atencio, Hexiong Yang, Andrés E. Goeta, Marcelo B. Andrade, M. H. Lemée-Cailleau

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Hydroxycalciomicrolite, Ca1.5Ta2O6(OH) is a new microlite-group mineral found in the Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. It occurs as isolated octahedral and as a combination of octahedral and rhombic dodecahedral crystals, up to1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ffe208b4be8f219de43e1087776ba88
https://doi.org/10.1180/minmag.2016.080.116

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Almeidaite, Pb(Mn,Y)Zn2(Ti,Fe3+)18O36(O,OH)2, a new crichtonite-group mineral, from Novo Horizonte, Bahia, Brazil

Autor: Nikita V. Chukanov, Antônio W. Romano, Luiz A.D. Menezes Filho, Luiz C.A. Oliveira, Mario Luiz de Sá Carneiro Chaves, Daniel Atencio, Igor V. Pekov, Roberto L. Moreira, A. I. C. Persiano, Ramiza K. Rastsvetaeva, Frederico Sousa Guimarães, Paulo Roberto Gomes Brandão, Ricardo Scholz, José D. Ardisson, Sergey M. Aksenov, R. Peter Richards, Klaus Krambrock

Publikováno v: Mineralogical Magazine. 79:269-283

Almeidaite (IMA 2013-020), ideally Pb(Mn, Y)Zn2(Ti,Fe3+)18O36(O, OH)2, from Novo Horizonte, Bahia, Brazil, occurs in association with quartz, rutile, anatase, hematite, kaolinite, muscovite, xenotime-(Y) and bastnaesite-(La). Almeidaite forms isolate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0df1d8b7de61872a3505392daee62b83
https://doi.org/10.1180/minmag.2015.079.2.06

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Purplish-red almandine garnets with alexandrite-like effect: causes of colors and color-enhancing treatments

Autor: Joachim Karfunkel, Frederico Sousa Guimarães, A. I. C. Persiano, Ariete Righi, Maurício V. B. Pinheiro, D. B. Hoover, Roberto M. Paniago, Klaus Krambrock

Publikováno v: Physics and Chemistry of Minerals. 40:555-562

Fine gem-quality, purplish-red garnets from the Tocantins State, Brazil, were investigated for their crystal chemistry and optical properties by several spectroscopic techniques, including electron microprobe analysis, Mossbauer, Raman spectroscopy a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::598bcc82fd06a2fade36b004d274997b
https://doi.org/10.1007/s00269-013-0592-6

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Strong dependence of ferrimagnetic properties on Co concentration in the Mn1−xAl1−yCox+y system

Autor: A. I. C. Persiano, J. D. Ardisson, Jacob Schaf, C. Paduani, A.Y. Takeuchi, I.C. Riegel

Publikováno v: Intermetallics. 18:1659-1662

The magnetic properties of Mn 1− x Al 1− y Co x + y alloys are outlined. Electron probe microanalysis (EPMA), scanning electron microscopy (SEM) and X-ray diffraction (DRX) measurements showed that all investigated samples are thoroughly homogene

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7741b72c910216806f37fb2094b93fca
https://doi.org/10.1016/j.intermet.2010.04.022

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Observation of weak ferromagnetism in the C14 Laves phase of the (Fe1-xNix)2Nb system

Autor: Jacob Schaf, A.Y. Takeuchi, J. D. Ardisson, M. T. Raposo, C. Paduani, A. I. C. Persiano

Publikováno v: physica status solidi (b). 246:1362-1365

In this work we report the observation of weak ferromagnetism in the hexagonal C14 Laves phase (s.g. P63/mmc) of the (Fe1–xNix)2Nb system, which has been reported as nonmagnetic in the literature. A larger unit cell volume is observed as compared t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::16a703e8c51774cf0a7c998956a63692
https://doi.org/10.1002/pssb.200844462

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Investigation of ferromagnetism in Mn1−xAl1−yFex+y alloys

Autor: José D. Ardisson, Jacob Schaf, A. I. C. Persiano, C. Paduani

Publikováno v: Journal of Alloys and Compounds. 479:1-5

The Mn1−xAl1−yFex+yalloys have been magnetically and structurally characterized. X-ray diffraction measurements showed that all investigated specimens possess predominantly a crystallographic phase with B2 structure, besides two minority phases i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f9f22c70580e86f40db1cc44fa071a12
https://doi.org/10.1016/j.jallcom.2008.12.062

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Evidence of weak ferromagnetism in the C14 Laves phase (Fe1−xCox)2Nb system

Autor: A. I. C. Persiano, A.Y. Takeuchi, José D. Ardisson, M. T. Raposo, C. Paduani, Jacob Schaf

Publikováno v: Journal of Alloys and Compounds. 474:34-37

In this work are studied the structure and magnetic properties of the (Fe 1− x Co x ) 2 Nb alloys with X-ray diffraction and magnetization measurements. The results confirm the formation of the C14 Laves phase in the Co concentration range 0 ≤ x

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0049bc3106d9e19dc3b7ffe72ede61c7
https://doi.org/10.1016/j.jallcom.2008.06.119

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Magnetocaloric effect and transport properties of Gd5Ge2(Si1−xSnx)2 (x=0.23 and 0.40) compounds

Autor: Fabiana Cristina Nascimento, M.C. Pereira, Sergio Gama, A. I. C. Persiano, Lisandro Pavie Cardoso, M. T. Raposo, J.C.P. Campoy, José Domingos Fabris, E. J. R. Plaza, Adelino A. Coelho

Publikováno v: Journal of Magnetism and Magnetic Materials. 316:368-371

We report a study about the structural properties of polycrystalline samples of nominal composition Gd 5 Ge 2 (Si 1− x Sn x ) 2 ( x =0.23, 0.40) that closely influence their physical behavior particularly related to electric resistivity and magneto

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::31889861718885324807cf26bff0d72f
https://doi.org/10.1016/j.jmmm.2007.03.023

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Giant magnetocaloric effect in Gd5(Si2Ge2) alloy with low purity Gd

Autor: Sergio Gama, A. M. G. Carvalho, C.S. Alves, A. I. C. Persiano, Edson Jesus Ramirez Plaza, Adelino A. Coelho, Lisandro Pavie Cardoso

Publikováno v: Materials Research, Volume: 7, Issue: 4, Pages: 535-538, Published: DEC 2004
Materials Research v.7 n.4 2004
Materials research (São Carlos. Online)
Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
Materials Research, Vol 7, Iss 4, Pp 535-538 (2004)

Gd5(Ge1-xSi x), x < 4 based alloys are potential candidates for magnetic refrigeration in the range ~20 - ~290 K. However, one of the greatest obstacles for the use of that technology in large scale is the utilization of high pure Gd metal (99.99 wt.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8681baa4f7c2cab677b1255fa27e5466
https://doi.org/10.1590/s1516-14392004000400005

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[Untitled]

Autor: A. I. C. Persiano

Publikováno v: Hyperfine Interactions. 122:71-82

A survey of some important applications of 57Fe Mossbauer spectroscopy to the study of local magnetic and structural characteristics of the main phases in the rare-earth-transition metal (RE–TM) class of materials used in the development of the new

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6154b4d4de35472d5ca94de8d061fe10
https://doi.org/10.1023/a:1012637404652

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