• Szafrański, Marek
• Szafraniak, I.
• Małuszyńska, H.

Abstract

<p>A new pyridinium compound, dipyridinium iodide triiodide, [C 5 NH 6 ] 2 + I - I 3 - , was studied by X-ray diffraction and dielectric permittivity measurements. Both its structure and dielectric properties are unique within the group of pyridinium salts. The room temperature structure is orthorhombic, space group Fddd, Z=16, a=14.208(1), b=16.320(2), c=28.410(3) . At 276.3(5) K the crystal undergoes a first-order phase transition to the low-temperature phase. This transition is induced by the ordering of the cations, which are also responsible for two dielectric relaxation processes disclosed at low temperatures. © 2002 Taylor and Francis.</p>

Topics

• impedance spectroscopy
• compound
• phase
• x-ray diffraction
• phase transition
• space group