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Titolo:
STRUCTURAL AND ELECTRICAL-PROPERTIES OF SOL-GEL-PROCESSED CDTIO3 POWDERS AND FILMS
Autore:
MONTENERO A; CANALI M; GNAPPI G; BERSANI D; LOTTICI PP; NUNZIANTE P; TRAVERSA E;
Indirizzi:
UNIV ROMA TOR VERGATA,DEPT CHEM SCI & TECHNOL,VIA RICERCA SCI I-00133ROME ITALY UNIV ROMA TOR VERGATA,DEPT CHEM SCI & TECHNOL I-00133 ROME ITALY UNIV PARMA,DEPT CHEM I-43100 PARMA ITALY UNIV PARMA,CORIVE I-43100 PARMA ITALY UNIV PARMA,DEPT PHYS I-43100 PARMA ITALY
Titolo Testata:
Applied organometallic chemistry
fascicolo: 2, volume: 11, anno: 1997,
pagine: 137 - 146
SICI:
0268-2605(1997)11:2<137:SAEOSC>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
THIN-FILMS; METAL-OXIDES; SENSORS;
Keywords:
CDTIO3; SOL-GEL; THIN FILMS; POWDERS; RAMAN SPECTROSCOPY; X-RAY DIFFRACTION (XRD); SCANNING ELECTRON MICROSCOPY (SEM); ELECTRICAL PROPERTIES; STRUCTURAL PROPERTIES; HUMIDITY SENSORS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
A. Montenero et al., "STRUCTURAL AND ELECTRICAL-PROPERTIES OF SOL-GEL-PROCESSED CDTIO3 POWDERS AND FILMS", Applied organometallic chemistry, 11(2), 1997, pp. 137-146

Abstract

Cadmium titanate, CdTiO3, was prepared by the sol-gel technique in bulk and in thin film form, The thermal evolution of the gels and the phase changes were studied by thermogravimetric analysis (TGA), X-ray diffractometry (XRD) and Raman and energy-dispersive (EDS) spectroscopies, The morphology of the samples was observed using scanning electron microscopy (SEM), Gels heated to 800 degrees C gave rise to powders with only the ilmenite-like phase, The orthorhombic perovskite phase is the only crystalline phase observed after a 4 h heat-treatment at 1100degrees C, With respect to the conventional preparation method by solid-state reaction, by the sol-gel method it is possible to prepare theilmenite phase at lower temperatures and the perovskite phase in a shorter time, Clear, homogeneous thin films were obtained by the dip-coating method, The refraction index and the thickness of the films were measured using ellipsometry, The humidity-sensitive electrical properties were measured for thin films deposited on alumina substrates with comb-type gold electrodes, heated to 200 degrees C and 450 degrees C. The films heated to 200 degrees C, which still contained organics, showed a variation of the resistance of six orders of magnitude in the relative humidity (RH) range tested (4-87% RH), The films heated to 450 degrees C, made of ilmenite-type CdTiO3, were nearly insensitive to RH. (C) 1997 by John Wiley & Sons, Ltd.

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Documento generato il 12/07/20 alle ore 03:09:47