Unprecedented lattice volume expansion on doping stereochemically active Pb²⁺ into uniaxially strained structure of CaBa_1-xPb_xZn₂Ga₂O₇.

ABSTRACT: Lone pair cations like Pb²⁺ are extensively utilized to modify and tune physical properties, such as nonlinear optical property and ferroelectricity, of some specific structures owing to their preference to adopt a local distorted coordination environment. Here we report that the incorporation of Pb²⁺ into the polar "114"-type structure of CaBaZn₂Ga₂O₇ leads to an unexpected cell volume expansion of CaBa_1-xPb_xZn₂Ga₂O₇ (0 ≤ x ≤ 1), which is a unique structural phenomenon in solid state chemistry. Structure refinements against neutron diffraction and total scattering data and theoretical calculations demonstrate that the unusual evolution of the unit cell for CaBa_1-xPb

SUBMITTER: Jiang P 

PROVIDER: S-EPMC7066146 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature