Chemical composition and magnetic property modifications of Na2Ti2Sb2O using PTFE as an alkali–metal ion extraction reagent

• Alkali–metal ion extraction using polytetrafluoroethylene as an extraction reagent (AEP) is applicable to highly air- and solvent-sensitive compounds.
• AEP is applicable to mixed-anion compounds.
• AEP can be utilized to modify chemical compositions and physical properties of alkali–metal ion containing inorganic compounds.

Na+ extraction from Na2Ti2Sb2O has been attempted using polytetrafluoroethylene (PTFE; empirical formula CF2) as the extraction reagent. Systematic increase in both lattice parameters a along the intralayer direction and c along the interlayer direction was observed with respect to the reacted PTFE amounts, suggesting the successful deintercalation of the interlayer Na+. In addition, ferromagnet-like behavior, which is rare for systems consisting of ions with low magnetic moments, such as Ti3+(d1), was observed in the Na+-deintercalated Na2Ti2Sb2O. This result suggests that the method of alkali–metal ion extraction using polytetrafluoroethylene as an extraction reagent (AEP) can be utilized in order to induce interesting and important properties in compounds including highly air- and solvent-sensitive mixed-anion compounds such as Na2Ti2Sb2O.

Performance of polytetrafluoroethylene (PTFE) as a reagent to deintercalate Na+ from a highly air- and solvent-sensitive compound Na2Ti2Sb2O2 has been studied.Figure optionsDownload as PowerPoint slide