The variation of Madelung constants with the face angle of the rhombohedron produced by distortion of a caesium-chloride-type lattice along one of its four threefold axes has been computed. Maxima are found at face angles of the unit cell of 90°(CsCl, Pm3m) and 60°(NaCl, Fm3m) and a minimum at about 79°. Negative values of the Madelung constant are found at angles of 24° and less.
H. D. B. Jenkins and T. C. Waddington, Trans. Faraday Soc., 1969, 65, 1231 DOI: 10.1039/TF9696501231
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