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论文类型：期刊论文

发表时间：2008-11-01

发表刊物：IONICS

收录刊物：SCIE、EI

卷号：14

期号：6

页面范围：471-476

ISSN号：0947-7047

关键字：Lanthanum silicate; Apatite structure; IT-SOFC; Magnetron sputtering

摘要：Apatite-type La9.33Si6O26 thin films were elaborated by co-sputtering of two metallic La and Si targets powered, respectively, by high power impulse magnetron sputtering and direct current sources, in pure Ar atmosphere, followed by a subsequent high temperature oxidation treatment in air. The structural and chemical features of these films have been assessed by X-ray diffraction and scanning electron microscopy (SEM). The film with near lanthanum silicate La/Si atomic ratio deposited on a porous Ni-YSZ cermet substrates was initially amorphous. After thermal oxidation at 1,173 K in air, the coating crystallised under the expected apatite structure. SEM observation revealed that both film compactness and thickness increased after thermal oxidation. The conductivity evolution with temperature of the pure apatite-like lanthanum silicate coatings, as measured by complex impedance spectroscopy, showed that the activation energy of is quite low compared to the literature data.