Title of article :
Optical properties of the new potential infrared-detectors Cu(I)2SO3 · M(II)SO3 · 2H2O (M = Cu, Fe, Mn, and Cd) series and the influence of M(II) exchange
Author/Authors :
Silva، نويسنده , , Luciana A. and de Araْjo، نويسنده , , Marcos A. and de Andrade، نويسنده , , Jailson B. and Silva، نويسنده , , Kelly A. and David، نويسنده , , Denis G.F. and da Silva، نويسنده , , Antônio Ferreira and Pepe، نويسنده , , Iuri، نويسنده ,
Abstract :
The optical absorption of mixed-valence sulfites such as Cu(I)2SO3 · M(II)SO3 · 2H2O [M = Cu, Fe, Mn, or Cd] were studied and the influence of the M(II) cation on this parameter. A transmission spectroscopy technique was used to measure the optical band gap energies (Eg) in the infrared region and the Eg of Cu(I)2SO3 · Cu(II)SO3 · 2H2O was estimated using a numerical fitting method that can be described empirically by E g ( χ P ) = - 0.62 χ P 2 + 1.88 χ P - 0.5 , where χP is Pauling’s electronegativity of metal M. The obtained values were in the interval 0.85–0.95 eV, representing a narrow Eg, which can identify these compounds as potential infrared-detectors.
