Abstract
The structural, vibrational, and especially the magnetic properties of natural and synthetic polycrystalline samples of the minerals mixite with composition (Bi,Ca)Cu6(OH)6(AsO4)3·nH2O (n ≈ 3) and goudeyite with composition YCu6(OH)6(AsO4)3·nH2O (n ≈ 3) were investigated. The magnetic susceptibilities are characterized by low‐dimensional antiferromagnetic short range ordering and can be well fitted by the theoretical susceptibilities of a spin S = 1/2 alternating Heisenberg chain with nearest‐neighbor spin exchange ranging between 200 K and 130 K for natural mixite and synthetic goudeyite, respectively. The alternation parameters, i.e. the ratios of nearest and next‐nearest neighbor spin exchange range between 0.52 for natural mixite and 0.75 for synthetic mixite and goudeyite, respectively. The experimentally observed spin exchange parameters are consistent with DFT calculations of the spin exchange parameters.
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