Thermally Induced Bi(III) Lone Pair Stereoactivity: Ferroelectric Phase Transition and Semiconducting Properties of (MV)BiBr5 (MV= methylviologen)

By Wenhua Bi, Nicolas Leblanc, N. Mercier, P. Auban-Senzier, C. Pasquier. 2009

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Regular BiBr5 chains of trans-connected octahedra are stabilized by methyviologen cations. The Bi3+ electron lone pair is sterochemically activated below −30 °C, leading to an acentric polar phase, and this is correlated with an increase of the band gap, and with the transfer from a para- to a ferroelectric phase.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/fcfd67b97224ddd2110f6fb312507445a99f0d6a