%0 Conference Paper %K Thin films %K Spectroscopy %K Oxygen %K Lanthanum compounds %K Strontium %K Doping (additives) %K Point defects %K Positrons %K Defect structure %K Oxygen vacancy related defects %K Positron annihilation spectroscopy %A T Friessnegg %A B Nielsen %A V.J Ghosh %A A.R Moodenbaugh %A S Madhukar %A S Aggarwal %A D.J Keeble %A E.H Poindexter %A P Mascher %A Ramamoorthy Ramesh %B Proceedings of the Materials Research Society Symposium - %D 1999 %G eng %P 161-165 %S Materials Research Society Symposium - %T Defect identification in (La, Sr)CoO3-δ using positron annihilation spectroscopy %V 541