BaCu(C20&. 6 H2O is triclinic, Pi, with a = 6.5405(9), b = 9.202(3), c = 10.939(1) A, a = 85.46(2), p == 79.22(1), y = 80.45(2), V = 636.99(1) A3, Z = 2, Do = 2.14, D, = 2.465g cm-", R = 0.074, w R = 0.0746 for 2219 significant reflections 2 6.0aFo. Thc barium has eleven coordinations and the coordination polyhedra is a capped antiprism. Six water oxygen atoms are coordinated whcrcas the othcr fivc are coming from the oxalate group. In the unit cell the molecules form a polymeric network. One lattice water molecule belongs to the coordinating water. The barium oxygen distarices vary from 2.75 A to 3.15 A.
The measurement of electrical conductivity for the investigation of the number of water molecules present in the mixed crystals of barium copper oxalate and barium ammonium oxalate lattice have been carried out in the temperature range 30 to 450 "C. The dehydration temperature and the number of water molecules removed out of the structure at a particular temperature is estimated from the sharp increase in conductivity at these points. The almost steep increase of conductivity is attributed to the increase in the number of mobile charge carriers H + and OHions generated from the escaping water molecules.The study of electrical conductivity in association with the thermal behaviour has been used to understand the mechanism of conduction.
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