Figure 3
Plot of the bond angle α against r(M) for β-M(OH)2 phases and for Ni-, Mg-, Zn- and Co-based LDH phases. The data point for Mg(OH)2 is an average value from six structure determinations: Catti et al. (1995 ), Černý et al. (1995 ), Chakoumakos et al. (1997 ), Desgranges et al. (1996 ), Isetti (1965 ), Zigan & Rothbauer (1967 ). The other data points for β-M(OH)2 phases are from: Kazimirov et al. (2010 , Ni(OH)2); Pertlik (1999 , Co(OH)2); Parise et al. (2000 , Fe(OH)2); Christensen & Ollivier (1972 , Mn(OH)2); Bertrand & Dusausoy (1970 , Cd(OH)2); Busing & Levy (1957 , Ca(OH)2). There are two data points for β-Zn(OH)2: one calculated from Baneyeva & Popova's (1969 ) structure that is labelled `Zn cBan' and a second from Richardson (2013 ) that is labelled `Zn c1'. Unfilled circles represent the values for the LDH phases and the dotted line is the linear regression fit for those data (the equation is given in the text). |