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The magnetic structure of β-Ni(OH)2 showing the three principal exchange interactions J1, J2 and J3, and the hexagonal arrangement of spins within the a–b plane. The spin directions within each plane are shown by the arrows aligned along the c-axis at the site of each Ni atom (small (grey) spheres). The O and H atoms are denoted by large (red) and small (pink) spheres, respectively. Copyright this work. (Online version in colour.)
