Non-shielded compounds

The electrical conductivity in the liquid state of the halides, e.g. the chlorides, also provides a well-marked difference between the non-conducting shielded compounds and the good conducting non-shielded compounds with free ions in the melt (Biltz, Klemm)17 . Aluminium chloride here also forms a special case in so far that quite exceptionally the solid substance (coordination lattice) has a higher conductivity than the liquid (molecules A12C16). 

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