Superionic Conduction in Complex Fluorides of Antimony(III) MnSbxFy (M—Cations of an Alkali Metal, Ammonium, or Thallium, n = 1–3, and x = 1–4)

• DOI: 10.1007/s11175-005-0095-y
• Publication Date: 2005-06-17T18:53:09Z
• Authors: V. Ya. Kavun; N. F. Uvarov; A. B. Slobodyuk; O. V. Brovkina; L. A. Zemnukhova; V. I. Sergienko
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Methods of 19F NMR and impedance spectroscopy are used to investigate the internal mobility of fluoride (ammonium) ions and electrophysical characteristics of complex trivalent antimony fluorides MSb4F13, MSb3F10, MSb2F7, M2Sb3F11, M3Sb4F15, and MSbF4 (M is an alkali cation, ammonium, thallium). The ion motion types in the cationic and anionic sublattices of the fluorides are determined at 150–500 K. The polymorphous transformations in the fluorides are usually phase transitions to a superionic state and their high ionic (superionic) conductivity (σ ≥ 10−4 to 10−2 S cm−1 at 400 K) is due to the diffusion motion of ions of fluoride, ammonium, and possibly sodium, potassium, and thallium. The high polarizability of thallium ions favors the development of high mobility of fluoride ions in the fluorides.