REPARTITION OF THE LAYER STRUCTURES

Ag20(p), TI2O SnO, PbO (all with contacting cation layers) 

RC2O75 o -Pt02, P2O5, As203(h), /3-Te02- 

Of course, the important family of the layered silicates also belongs to this group. 

Structure types occurring with binary tetrelides, pnictides, chalcogenides and halides. Layer structures 

Composition number phases without M—M or X—X bonds Polycompounds 

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An important supplementary tool for performance analysis of PEFC electrodes is the study of the complex impedance, as it provides a tool to monitor changes of electrode function upon variation of its composition. It can help to detect in real time the structural changes due to spontaneous or current-induced repartitioning of the elements of the porous dual percolation network, that could lead to phase segregation and catalyst layer degradation. 

Repartition of layer-type structures among the chalcogenides, pnictides and tetrelides of composition MX2. The layer structures are underlined. Chemical formulae are given where the structure type is not yet known, r, t, h, p room-temperature, low-temperature, high-temperature and high-pressure, resp. 

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