Zobrazeno 1 - 8 of 8 pro vyhledávání: '"W. C. Las"'
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Autor: Italo Odone Mazali, W. C. Las, Mario Cilense
Publikováno v: Journal of Materials Science. 38:3325-3330
The sintering behavior of SnO2-CuO system has been investigated for two preparation methods and as a function of antimony concentration. A chemical preparation (Pechini's method) resulted in powders with smaller particle sizes than for a conventional
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6d424a92dca054be3706ad33e689fc2f
https://doi.org/10.1023/a:1025102524795
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3
Electrical characterization of lead zirconate titanate prepared by organic solution route
Autor: Mario Cilense, Priscila D Spagnol, Maria Aparecida Zaghete, W. C. Las
Publikováno v: Ceramics International. 27:367-372
Two series of lead zirconate titanate (PZT) ceramics with composition Zr/Ti ≈ 53/47 have been prepared by the organic solution route. The effects on the electrical properties of calcination temperature in one series and of sintering time period in
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::32d2838a3ec806a979b6400e145fcb59
https://doi.org/10.1016/s0272-8842(00)00089-4
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4
The effect of isostructural seeding on the microstructure and piezoelectric properties of PZT ceramics
Autor: José Arana Varela, Maria Aparecida Zaghete, W. C. Las, Elson Longo, Mario Cilense, Carlos O. Paiva-Santos
Publikováno v: Ceramics International. 25:239-244
Pechini’s method was used to prepare lead titanate zirconate with Zr/Ti ratio equal to 53/47. X-ray diffraction data revealed the presence of a rhombohedral phase, rich in zirconium, due to difference in carbonate stabilities, in PZT ceramics calci
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2350cd3662713baa77440c3e37620023
https://doi.org/10.1016/s0272-8842(98)00029-7
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5
Influence of additives on the electrical properties of dense SnO2‐based ceramics
Autor: P. Dordor, J. P. Bonnet, N. Dolet, W. C. Las
Publikováno v: Journal of Applied Physics. 74:6191-6196
Highly densified 0.99 SnO2‐0.01 CuO‐based ceramics with antimony, tantalum, or niobium oxides as additives have been prepared. Samples have been characterized by dc conductivity and complex impedance spectroscopy as a function of temperature and
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9a145a0fa23046ad0ffb2bc6d979ae50
https://doi.org/10.1063/1.355188
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6
The effect of Cr concentration and preparation method on the microstructure and electrical characterization of SnO2-based ceramics
Autor: W. C. Las, Maria Aparecida Zaghete, Mario Cilense, Daniela Russo Leite, José Arana Varela
Publikováno v: SciELO
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Materials Research, Vol 6, Iss 4, Pp 457-461 (2003)
Materials Research v.6 n.4 2003
Materials research (São Carlos. Online)
Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
Materials Research, Volume: 6, Issue: 4, Pages: 457-461, Published: DEC 2003
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Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18bad0e060b7fe824db4ad186071fc38
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7
Thermoluminescent mechanisms involving transition metal ion impurities and V-type centres in MgO crystals exposed to ultraviolet radiation
Autor: W. C. Las, T. G. Stoebe
Publikováno v: Journal of Materials Science. 17:2585-2593
Thermoluminescent (TL) mechanisms involving Fe, Cr, Mn and V ions in both divalent and trivalent valence states, and V-type centres were studied in MgO single crystals of varying impurity content after exposure to ultraviolet radiation. Using the ESR
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2c47a62a04e1d4c94743232f25d8dae5
https://doi.org/10.1007/bf00543891
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8
Effects of the equilibrium concentration of impurities on the reproducibility of thermoluminescence in MgO
Autor: W. C. Las, T. G. Stoebe
Publikováno v: Journal of Materials Science. 16:1191-1196
A study of thermoluminescent (TL) sensitivity and reproducibility is undertaken in crystals of MgO exposed to ultraviolet radiation in the as-received condition, and heat treated in air or in a mixtue of CO/CO2 at either 1000 or 1400° C. The changes
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3d39107d0a0dad980d1815a805b7cf22
https://doi.org/10.1007/bf01033831
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