The magnetic susceptibilities of both polycrystalline and single-crystal samples of the compound diethylenetriammonium chlorocuprate (II), [

{(N H_{3} C H_{2} C H_{2})}_{2}

H_{2}

] [Cu

{Cl}_{4}

]Cl, have been measured from 1.6 to 160 °K. The compound undergoes a phase transition to an antiferromagnetic state at 11.8 °K with the

c

crystallographic axis as the preferred axis. Above the transition, the magnetic properties of this material reflect its two-dimensional structural characteristics, with the predominate feature being a ferromagnetic alignment of spins within a network of isolated copper ions. The high-temperature polycrystalline data have been fitted to a variety of models for a quadratic lattice. When the data are fit to the two-dimensional Heisenberg model for the quadratic lattice, a value of

\frac{J}{k} = 18.7

°K results. Although an excellent fit is achieved over a wide temperature range, the data are not able to discriminate between models in which there are variable degrees of anisotropy in the exchange. Finally, a comparison is made between [

{(N H_{3} C H_{2} C H_{2})}_{2}

H_{2}

] [Cu

{Cl}_{4}

]Cl and the thoroughly studied

{[C_{2} H_{5} N H_{3}]}_{2}

{Cl}_{4}

Publications with shared reference:

0 publications found