Abstract
The binary oxides of titanium and niobium, TiNb 2O 7, Ti 2Nb 10O 29, TiNb 24O 62 and TiNb 52O 132, have been examined by electron diffraction and microscopy. The structure of TiNb 52O 132, an ordered intergrowth of TiNb 24O 62 and high temperature Nb 2O 5, is clarified. There are many planar defects in these compounds which can be described in terms of the random intergrowth, at the unit cell level, of very thin fragments of other closely related phases. Similar intergrowths are found in regions of the phase diagram previously referred to as “solid solutions,” and a number of ordered sequences characteristic of new phases are described.
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