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The crystal structure of β-Ni(OH)2 represented by (a) unit cell projection and (b) ball-and-stick unit cell (u=0.24 and v=0.47 [26]; or u=0.2221 and v=0.4275 [27]). Medium size (grey) spheres, Ni2+; large (red) spheres, O2−; small (pink) spheres, H+. Unit cell parameters are listed in table 1. Copyright this work. (Online version in colour.)
