Understanding the phase transitions and texture in superionic PbSnF4

Structure, ionic conduction, and giant dielectric properties of mechanochemically synthesized BaSnF4

“…[11][12][13] The cation sublattice in these materials is derived from the cubic ␤-PbF 2 fluorite structure, except that the cations are ordered forming alternating double layers of Pb ͑Ba͒ and Sn atoms along the c-direction of the tetragonal unit cell. [11][12][13][14] Previously, PbSnF 4 could be prepared through different routes, such as the precipitation from aqueous solution and high temperature method. 14 On the other hand, BaSnF 4 could be obtained only through multiple-step solid-state reaction technique at 500°C.…”

“…14 On the other hand, BaSnF 4 could be obtained only through multiple-step solid-state reaction technique at 500°C. [12][13][14][15] For these fluoride materials, the reactions are performed inside inactive expensive metal containers in inert gas conditions. Recently, intensive research is devoted to mechanochemical milling as a synthesis tool for a variety of systems, such as alloys, glasses, and oxide inorganic solids, [16][17][18] leading to the synthesis of new functional materials with properties opening new fields of applications such as nanoceramics, bioceramics, and catalysts.…”

Síntesis y caracterización de nuevas soluciones sólidas de fluoruros con estructura tipo fluorita y derivadas

“…La estructura del PbSnF 4 es una forma derivada de β-PbF 2 , la secuencia de la subred catiónica a lo largo del eje c es: Pb Pb Sn Sn Pb Pb ....., y forma una supercelda, duplicando el valor de c, por lo tanto se destruye la red de Bravais F y se rompe la simetría cúbica para dar lugar a una celda tetragonal (4,18).…”

“…El dopaje con iones isovalentes altamente polarizables como el Sn 2+ , ha mostrado un extraordinario incremento en la conductividad en los cristales de PbF 2 , formando un conductor rápido de aniones PbSnF 4 (5)(6)(7)(8). Sin embargo, presenta un esquema muy complicado de polimorfismo que depende de las condiciones de síntesis (16)(17)(18).…”

Preparation and Characterization of Pb2SnF6, The First Lead(II)-TIN(II) Fluoride that is a Superstructure of A-PbF2

“…In the first study by Donaldson and Senior, PbSnF 4 was isolated, and the existence of PbSn 2 F 6 was predicted from the melting point diagram of the system, however only PbSnF 4 was prepared [1]. Later, one of us (GD) et al discovered several new ways of preparing PbSnF 4 , identified several phase transitions of PbSnF 4 , and characterized new phases in the PbF 2 /SnF 2 system [2][3][4][5][6][7][8][9][10][11][12][13][14]. The stable phase at ambient temperature, α -PbSnF 4 is a tetragonal distortion of cubic fluorite-type β -PbF 2 , with … Pb Pb Sn Sn … order parallel to the c axis of the unit-cell, resulting in a (a/√2 a/√2 2c) superstructure ( fig.…”