title: Mild hydrothermal synthesis of Cu(SeO(3)).2H(2)O: structural characterization, thermal, spectroscopic and magnetic studies.
abstract: Cu(SeO(3)).2H(2)O has been synthesized by hydrothermal technique under autogeneous pressure. The compound crystallizes in the P2(1)2(1)2(1) orthorhombic space group. The unit cell parameters are a=6.672(1), b=9.167(1) and c=7.372(1) A with Z=4. The crystal structure has been refined using the Rietveld method. The limit of thermal stability is 130 degrees C, temperature at which the water content is lost. Above 470 degrees C the compound decomposes in SeO(2)(g) and CuO(s). The IR spectrum shows the characteristic bands of the (SeO(3))(2-) oxoanion and water molecules. An intense absorption band characteristic of Cu(II) cations in five-coordination is observed in the diffuse reflectance spectrum. The ESR spectra are isotropic from room temperature to 4.2K, with g=2.13(1). Magnetic measurements confirm the existence of a global antiferromagnetic behavior with a spin canting phenomenon detected at, approximately, 30K.
authors.affiliation: Departamento de Mineralogía y Petrología, Universidad del País Vasco/EHU, Apdo. 644, E-48080 Bilbao. Spain.
authors.forename: Aitor
authors.initials: A
authors.lastname: Larrañaga
authors.forename: José L
authors.initials: JL
authors.lastname: Mesa
authors.forename: Luis
authors.initials: L
authors.lastname: Lezama
authors.forename: María I
authors.initials: MI
authors.lastname: Arriortua
authors.forename: Teófilo
authors.initials: T
authors.lastname: Rojo
mesh_terms: D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry; D008280:Magnetics; D008958:Models, Molecular; D015394:Molecular Structure; D012643:Selenium / Q000737:chemistry*; D013057:Spectrum Analysis; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D003300:Copper; D012643:Selenium