title: [XPS study on the influence of calcination conditions to cerium ion valence].
authors.affiliation: College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China. meiyan@bjut.edu.cn
authors.forename: Yan
authors.initials: Y
authors.lastname: Mei
authors.forename: Jian-ping
authors.initials: JP
authors.lastname: Yan
authors.forename: Zuo-ren
authors.initials: ZR
authors.lastname: Nie