锰酸锶镧薄膜的制备及组织、性能研究

Films with stoichiometric formula La0.8Sr0.2MnO3 and La0.6Sr0.4MnO3 were fabricated on alumina substrates by the screen printing method. Microstructure, phase compositions and electrical conductivity of the films prepared with different slurry constitutions were investigated by SEM, XRD and four-point d.c. method, and the effects of solvent and additive in the slurry on the microstructure and properties of the films were mainly analyzed. It was indicated that the preparing technology of the films with smooth surface, uniform thickness, strong bond strength between the film and substrate, and low electrical resistance, demanded that the La1-xSrxMnO3 powder was used as the electrical matrix, terpilenol as the solvent with 63.5 ~ 254 wt% of the matrix, PEG as the additive with 16 wt%, the final sintering temperature as 1200 ℃ with 2 h. In addition, the bond strength and resistance of the La0.6Sr0.4MnO3 film have some enhancement with the addition of fritted glaze.