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The specific heat of Cu[NH₂(CH₂)₃NH₂]₂SO₄ ·{} H₂O ("CPDS·{}H₂O") and of a mixed sample of Cu(NH₃)₄-SeO₄ ("CTSel") and Cu(NH₃)₄SeO₄·{}H₂O ("CTSel·{}H₂O") have been measured from 2 to 20 K, and excellent agreement has been obtained with the Bonner-Fisher theory for infinite magnetic linear chains of spin {}, with an isotropic Heisenberg interaction between nearest neighbors. From the fit between experiment and theory, the following exchange constants J are obtained: CPDS·{}H₂O, (1.09_-0.08+0.04) K; CTSel, (0.24₅ ±{}0.03) K; and CTSel·{}H₂O, (2.36±{}0.03) K. A preliminary description of the crystal structures of these compounds is also given. CTSel·{}H₂O is isomorphous with Cu(NH₃)₄SO₄·{}H₂O; in addition, a close structural relationship is found between these salts and CPDS·{}H₂O. Thus, the variation of J with interionic separation r may be estimated for these simple linear systems. This estimate gives $N=10.9$ where J=ar^-n.
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Lowndes et al. (1969) studied this question.
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