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Absence of phase separation in nano-chessboard super-lattices in A-site deficient Ca-stabilized Nd2/3TiO3

A-site deficient perovskites form a class of functional oxides of particular interest because of their attractive properties, such as ionic conductivity [1], dielectric behaviour [2] and transport properties [3]. A number of these ceramics show ‘cross-type’ satellite reflections in their [001] diffraction patterns indicating the presence of a two-dimensional superstructure, that has been attributed to a micro domain model comprising of a system of periodically tilted oxygen octahedra [4]. Intriguingly several such compounds exhibit a peculiar contrast in their [001] High Resolution Transmission Electron Microscopy images (HRTEM), resembling a ‘nano-chessboard’. The origin of this contrast has been the object of debate, with two main models put forward: the first is based on a chemical phase separation into ‘chessboard’ domains [5] and the second one attributes the origin of observed contrast to strain arising from a network of incommensurately titled oxygen octahedra [6].