COMPOSITION STUDIES OF 1 F NOISE IN RUO2-GLASS FILMS/

Relative power spectral density S-U/U-2 of 1/f noise in RuO2-glass fil ms versus RuO2 volume fraction v has been studied. Pastes that are bin ary mixtures of RuO2 and glass powders with the mean particle sizes of 10 nm and 550 nm have been used. Films of different RuO2 concentratio n v in the range from 0.06 to 0.28 have been produced by conventional screen printing and firing of the pastes deposited on alumina substrat es. The firing was carried out at the peak temperature of 850 degrees C in the air atmosphere belt-type furnace. Noise power spectral densit y has been measured using cross-correlation technique in a measuring s ystem based on Hewlett Packard Dynamic Signal Analyzer and personal co mputer to storage and process the noise signal data. Typical 1/f noise behavior with power spectral density inversely proportional to freque ncy and proportional to the square of the de voltage U applied to the sample have been observed. The relative power spectral density of 1/f noise at 1Hz versus resistance per square has been analyzed in terms o f the percolation power-law. Discussion of the 1/f noise models based on percolation and localization theories has been presented. (C) 1998 Elsevier Science Ltd. All rights reserved.