Lanthanum strontium manganite
It has a perovskite-based crystal structure, which has the general form ABO3. In the crystal, the 'A' sites are occupied by lanthanum and strontium atoms, and the 'B' sites are occupied by manganese atoms. In other words, the material consists of lanthanum manganite doped with strontium oxide.
LSM is black in color and has a density of approximately 6.5 grams/mL. The actual density will vary depending on the processing method and actual stoichiometry. LSM is primarily an electronic conductor, with transference number close to 1.
This material is commonly used in as a cathode material in commercially produced solid oxide fuel cells (SOFCs) because it has a high electrical conductivity at higher temperatures, and its thermal expansion coefficient is well matched with yttria-stabilized zirconia (YSZ), a common material for SOFC electrolytes.
LSM behaves like a half-metal, suggesting its possible use in spintronics. It displays a colossal magnetoresistance effect. Above its Curie temperature (about 350K) Jahn-Teller polarons are formed; the material's ability to conduct electricity is dependent on the presence of the polarons.
- "Lanthanum Strontium Manganite Supplier & Tech Info". American Elements. Retrieved 2008-04-19.
- Performance of Solid Oxide Fuel Cells with LSGM-LSM Composite Cathodes, J. Electrochem. Soc., Volume 149, Issue 12, pp. A1565-A1571 (2002)
- A P Ramirez (1997) Colossal magnetoresistance. J. Phys.: Condens. Matter 9, 8171-8199.
- J H Park et al (1998) Direct evidence for a half-metallic ferromagnet. Nature 392, 794-796.
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