Abstract
Magnetic susceptibilities and specific heats of mixed crystals of Mn x Cd (1- x ) (NH 3 ) 2 ·Ni(CN) 4 ·2C 6 H 6 have been measured on powder specimens from 0.20 K to 4.20 K. The Weiss temperature θ( x ) and the Néel temperature T N ( x ) for the concentration x of magnetic ion Mn 2+ have been determined. θ( x ) is proportional to x . The critical concentration x c is estimated as 0.69 from T N ( x ). This value supports the assumption that Mn(NH 3 ) 2 ·Ni(CN) 4 ·2C 6 H 6 is the psued-two dimensional Heisenberg antiferromagnet.
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