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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 47, Iss. 10 — Oct. 1, 1993
  • pp: 1704–1711

Reflectance Spectra and Color of Potassium and Silver Chromates in Various Matrices

T. Tłaczała, M. Cieślak-Golonka, A. Bartecki, and M. Raczko

Applied Spectroscopy, Vol. 47, Issue 10, pp. 1704-1711 (1993)


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Abstract

The matrix influence on the diffuse reflectance spectra of K<sub>2</sub>CrO<sub>4</sub> and Ag<sub>2</sub>CrO<sub>4</sub> has been studied spectroscopically and colorimetrically. Oxide matrices (MgO, BaO, Li<sub>2</sub>CO<sub>3</sub>) were found to be inert towards the studied compounds. In halide matrices, the symmetry decrease of the tetrahedral CrO<sub>4</sub><sup>2-</sup> ion was observed through the appearance of the symmetry-forbidden transitions and intensity reversal. A bathochromic shift of the bands, in comparison to the results for K<sub>2</sub>CrO<sub>4</sub>, was found in the Ag<sub>2</sub>CrO<sub>4</sub>/Ag<sub>2</sub>SO<sub>4</sub> system. It is explained under the assumption of strong cationanion interaction in the latter. On the basis of the color parameters, the halide matrices can be ordered according to their inertness towards K<sub>2</sub>CrO<sub>4</sub>. The quantitative relationship between the matrix effect and the molecular size of the host lattice components is given for K<sub>2</sub>CrO<sub>4</sub>.

Citation
T. Tłaczała, M. Cieślak-Golonka, A. Bartecki, and M. Raczko, "Reflectance Spectra and Color of Potassium and Silver Chromates in Various Matrices," Appl. Spectrosc. 47, 1704-1711 (1993)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-47-10-1704


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