Etude des proprietes structurales et electrioues d'un nouveau conducteur anionique: PbSnF4

Temperature dependence of19F NMR and ion transport parameters of fluoride ion conductors SnF2—PbF2and 2SnF2—NH4F prepared by mechanical milling

“…have been reported to be good fluoride ion conductors with room temperature conductivity of the order of 10 -3 to 10 -4 S/cm [1][2][3][4][5]. The synthesis of mixed metal fluorides is generally carried out by solid state reaction method and sometimes by solution method [1][2][3][4][5][6][7][8][9][10] and the loss of fluorine (if any) is generally minimized either by the addition of ammonium bifluoride to the starting composition or by the fluorination method [11,12]. Ball milling which is generally used in the synthesis of various non-equilibrium compounds, amorphous phases etc.…”

The thermodynamics of the divalent metal fluorides. I. Heat capacity of lead tetrafluorostannate, PbSnF4, from 10.3 to 352 K

“…PbSnF4 has been found to possess a high ionic conductivity (2), and is among the best-known anionic conductors. Because of the use of fluoride electrolytes as thin films in galvanic cells, specific electrodes for fluoride ions, or gas detectors (3)(4)(5)(6), considerable attention has been directed at experimental work on fluorides with the fluorite-type structure, including the family MSnF4 where M = Pb, Ba, Sr.…”

“…Several allotropic forms of PbSnF4 have been shown to exist at temperatures above 273 K by DTA and X-ray diffraction studies (1,2,(7)(8)(9)(10). The normal a-phase at room temperature, which depends upon the method of preparation, has a monoclinic, sometimes called a pseudo-orthorhombic monoclinic, structurewitha = 4.204, b = 4.205, c = 11.414.A, y = 91°34', a space group of P2/,, and stability to about 353 K. The P-phase, stable between about 353 and 623 K, possesses a tetragonal structure with a space group of P4/nmm (7)(8)(9).…”

Structure and ion dynamics of mechanosynthesized oxides and fluorides

“…Preliminary measurements [61] have shown that it is possible to replace at least 0.1 formula units by RbF. Ba 0.9 Rb 0.1 SnF 3.9 indeed shows higher conductivities than BaSnF 4 , see Figure 17a for a comparison with results from Réau et al [66], Dénès et al [63] and Chadwick et al [67] If the amount of RbF is increased too much, i.e. if it exceeds x = 0.2, RbF cannot be incorporated into BaSnF 4 any longer, see the reflections in Figure 16.…”