Fast ion conduction character and ionic phase-transitions in disordered crystals: the complex case of the minerals of the pearceite–polybasite group

@article{Bindi2006FastIC,
  title={Fast ion conduction character and ionic phase-transitions in disordered crystals: the complex case of the minerals of the pearceite–polybasite group},
  author={Luca Bindi and Michel Evain and Annie Pradel and St{\'e}phanie Albert and Michel Ribes and Silvio Menchetti},
  journal={Physics and Chemistry of Minerals},
  year={2006},
  volume={33},
  pages={677-690}
}
The minerals of the pearceite–polybasite group, general formula (Ag,Cu)16M2S11 with M = Sb, As, have been recently structurally characterized. On the whole, all the structures can be described as a regular succession of two module layers stacked along the c axis: a first module layer (labeled A), with general composition [(Ag,Cu)6(As,Sb)2S7]2−, and a second module layer (labeled B), with general composition [Ag9CuS4]2+. In detail, in the B layer of the pearceite structure silver cations are… 
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TLDR
A pattern of the possible mechanism regulating the type of unit cell that is stabilized is proposed, starting from the hypothetical stoichiometric and fully ordered Ag(15)CuSb(2)S(11) 222-polybasite structure, with a low C2/c monoclinic symmetry and a large 222 supercell.
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