title: A facile peroxo-precursor synthesis method and structure evolution of large specific surface area mesoporous BaSnO3.
abstract: In this paper, we propose a facile and efficient strategy for synthesizing mesoporous BaSnO3 with a surface area as large as 67 m(2)/g using a peroxo-precursor decomposition procedure. As far as we know, this is the largest surface area reported in literature for BaSnO3 materials and may have a potential to greatly promote the technological applications of this kind of functional material in the area of chemical sensors, NOx storage, and dye-sensitized solar cells. The structure evolution of the mesoporous BaSnO3 from the precursor was followed using a series of techniques. Infrared analysis indicates large amount of protons and peroxo ligands are contained in the peroxo-precursor. Although the crystal structure of the precursor appears cubic according to the analysis of X-ray diffraction data, Raman and Mössbauer spectroscopy results show that the Sn atom is offset from the center of [SnO6] octahedron. After calcination at different temperatures, the precursor gradually transforms into BaSnO3 by release of water and oxygen, and the distortion degree of [SnO6] octahedral decreases. However, a number of oxygen vacancies are generated in the calcined samples, which are further confirmed by the physical property measurement system, and they would lower the local symmetry to some content. The concentration of the oxygen vacancies reduces simultaneously as the calcination temperature increases, and their contributions to the total heat capacity of the sample are calculated based on theoretical analysis of heat capacity data in the temperature region below 10 K.
authors.affiliation: †Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.|‡University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Chuande
authors.initials: C
authors.lastname: Huang
authors.affiliation: †Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Wang
authors.affiliation: †Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Quan
authors.initials: Q
authors.lastname: Shi
authors.affiliation: †Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.affiliation: §Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: †Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.|‡University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Huang
authors.affiliation: †Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
mesh_terms: D017609:Barium Compounds / Q000737:chemistry*; D015394:Molecular Structure; D010087:Oxides / Q000138:chemical synthesis* / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties; D013696:Temperature; D017971:Tin Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D017609:Barium Compounds; D010087:Oxides; D017971:Tin Compounds; D014867:Water; D010100:Oxygen