Elastic- and electrostatic-energy considerations are insufficient for an explanation of cation ordering between tetrahedral and octahedral sites in spinels. Tetrahedral, octahed...
We point out that the existence of a phase transition-as indicated by extrapolation from high-temperature expansions-is as well-founded for two-dimensional lattices with nearest...
We consider a new model Hamiltonian ${\mathcal{H}}^{(\ensuremath{\nu})}$ for interacting $\ensuremath{\nu}$-dimensional classical "spins"; ${\mathcal{H}}^{(\ensuremath{\nu})}$ r...
Crystallographic and magnetic measurements of the system Li+xNi++1−2xNi+++xO for the entire range 0≤x<0.5 are reported. For values of x≤0.3, the lattice appears to be ant...