Mössbauer and electronic-reflectance spectroscopic studies and resistivity measurements on the systems CsPb_1–xSn_xBr₃, CsPb_1–xSn_xBr₂Cl, M_xCs_1–xSnBr₃, and M_xCs_1–xSnBr₂Cl (M = Na, K, Rb, and NH₄)

1 January 1977

journal article
research article
Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.

No. 9,p. 906-908
https://doi.org/10.1039/dt9770000906

Abstract

A series of coloured compounds of general formula CsPb_1–xSn_xX₃(X₃= Br₃ or Br₂Cl) has been prepared. X-Ray and Mössbauer data show that the compounds have highly symmetrical tin–lead environments. Their electronic resistivity and optical-reflectance spectra are interpretable in terms of the partial filling of electronic bands produced by the interaction of orbitals of the bromine atoms. As x increases the band population increases, consistent with the lower ionisation energies of the tin 5s electrons compared to those of the lead 6s electrons. Replacement of Cs⁺ by Na⁺, K⁺, Rb⁺, or [NH₄]⁺ shows that these singly charged ions have no effect on band formation. Replacement of Br₃ by Br₂Cl raises the energy of the band due to the inclusion of the higher-energy chlorine orbitals.

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Mössbauer and electronic-reflectance spectroscopic studies and resistivity measurements on the systems CsPb1–xSnxBr3, CsPb1–xSnxBr2Cl, MxCs1–xSnBr3, and MxCs1–xSnBr2Cl (M = Na, K, Rb, and NH4)

Abstract

Keywords

Mössbauer and electronic-reflectance spectroscopic studies and resistivity measurements on the systems CsPb_1–xSn_xBr₃, CsPb_1–xSn_xBr₂Cl, M_xCs_1–xSnBr₃, and M_xCs_1–xSnBr₂Cl (M = Na, K, Rb, and NH₄)