23 KB3035 KB21 KB200020242007Maček, JadranMarinšek, MarjanRazpotnik, TanjaZupan, Klementinaštevilka:2letnik:416 stranistr. 85-90ISSN:1580-2949COBISSID:603562URN:URN:NBN:SI:doc-A0ICAPFIenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeelektrična prevodnostkatodakoprecipitacijalantanov stroncijev manganitmikrostrukturaA co-precipitation procedure for the synthesis of LSM material| Sobarjanje LSM za pripravo katodnih materialov za gorivne celice|Lanthanum manganite substituted with strontium is a strong candidate for use as a mixed conductor at the cathode site in solid-oxide fuel-cell systems. In the present work a co-precipitation method for the preparation of LSM is described and some material properties are reported. Since the co-precipitation involved calcination at 1000 °C and subsequent sintering, the crystalline phase development and the material homogeneity were followed by X-ray powder diffraction. It was found that no secondary crystalline phases were present in the system when the samples were thermally treated up to 1200 °C. The sintering behaviour of the calcined powders and their density evolution are also reported. Relatively dense bodies were prepared after thermal treatment at 1200 °C for 2 hours. The electrical characteristics of the material were determined from screen-printed LSM sintered layers. The electrical conductivity of the screen-printed layers increased with the sintering temperature due to an additional densification effect. Porous LSM bodies were prepared by methyl cellulose admixing as a pore-formerNajpogosteje uporabljan katodni material v visokotemperaturni izvedbi gorivnih celic (SOFC) je lantanov manganit, dopiran s stroncijem (LSM). LSM s sestavo Laspodaj{0,85}Srspodaj{0,15}MnOspodaj{3-d} smo priprav!li z novo metodo soobarjanja iz raztopine karbonatov. Oborino smo po filtraciji in spiranju sušili pri 110 °C in nato kalcinirali pri 1000 °C. Po kalcinaciji pri različnih temperaturah in po sintranju smo prahove analizirali z rentgensko praškovno analizo. Materialiso po sintranju vsebovali le perovskitno kristalno obliko lantanovega manganita. Parametre sintranja prahov LSM po kalcinaciji pri 1000 °C smo določili s segrevalnim mikroskopom. Vzorce LSM z dodatkom tvorca por in brez njega smo po sintranju analizirali z elektronsko mikroskopijo. Električne karakteristike tiskanih plasti LSM smo določili s štiritočkovno metodo. Specifična električna prevodnost pripravljenih plasti LSM je primerljiva z literaturnimi podatki za materiale LSM, ki so bili pripravljeni po kalcinacijskem postopkuTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije