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Titolo:
STUDY OF THE CONDUCTION MECHANISM OF MGAL2O4 AT DIFFERENT ENVIRONMENTAL HUMIDITIES
Autore:
GUSMANO G; MONTESPERELLI G; NUNZIANTE P; TRAVERSA E;
Indirizzi:
UNIV ROMA TOR VERGATA,DIPARTIMENTO SCI & TECNOL CHIM I-00173 ROME ITALY
Titolo Testata:
Electrochimica acta
fascicolo: 17, volume: 38, anno: 1993,
pagine: 2617 - 2621
SICI:
0013-4686(1993)38:17<2617:SOTCMO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRICAL-PROPERTIES; SENSORS; SENSITIVITY; CERAMICS;
Keywords:
HUMIDITY SENSORS; MGAL2O4; ELECTRICAL PROPERTIES; CONDUCTION MECHANISM; MICROSTRUCTURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
G. Gusmano et al., "STUDY OF THE CONDUCTION MECHANISM OF MGAL2O4 AT DIFFERENT ENVIRONMENTAL HUMIDITIES", Electrochimica acta, 38(17), 1993, pp. 2617-2621

Abstract

In this paper, the electrical properties of MgAl2O4, which has been proposed as a sensitive material for humidity detection devices, are discussed in relation to its microstructure. MgAl2O4 was studied both inbulk and in thin-film forms. Different pellets of MgAl2O4 were obtained by sintering powders prepared by different processes, in order to produce a different microstructure. 80 nm thick thin-films were prepared by radio-frequency sputtering on a Si/SiO2 substrate. Surface area, density and pore-size distribution were measured for the pellets. The microstructure of all the specimens was observed using SEM. The electrical behaviour of the specimens was studied using electrochemical impedance spectroscopy in the frequency range from 10(-2) to 10(5)Hz at relative humidity (RH) values ranging from 5 to 85%. The variation of dielectric parameters, calculated at different frequencies as a functionof RH, was investigated to study the conduction mechanism. The humidity-sensitive electrical properties of MgAl2O4 were correlated with itsmicrostructure. In order to determine the conduction carriers, the samples were polarized at 1 V dc and the charging and discharging currents were measured.

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Documento generato il 12/07/20 alle ore 01:29:13