Related Experiment Video
Updated: Mar 31, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
Observation of Anion Order in Pb2Ti4O9F2
Kengo Oka1, Katsuyoshi Oh-ishi1
1Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University , Bunkyo-ku, Tokyo 112-8551, Japan.
Abstract:
The observation of anion order is indispensable for the investigation of oxyfluorides. However, the negligible contrast between O(2-) and F(-) in both X-ray and neutron diffraction obscures the distinct anion sites for Rietveld refinement. Therefore, the difference in the chemical bonding of M-O(2-) and M-F(-) is the key to determining anion order. In this study, bond-valence-sum calculations and determination of the electron density distribution by the maximum entropy method illustrated anion order in the newly synthesized oxyfluoride Pb2Ti4O9F2. These results demonstrate a promising method to determine anion order in mixed anion systems.
More Related Videos
Related Concept Videos
Ionic Bonding and Electron Transfer
Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Valence Bond Theory
Ionic Radii
Ions and Ionic Charges
Ionic Compounds: Formulas and Nomenclature

