Abstract
A metastable Nb 2O 5 modification, obtained by fast and complete oxidation of the monoclinic form of Nb 12O 29, is transformed into the stable HNb 2O 5, modification by heating in air above 700° C whereas the reduction of the metastable Nb 2O 5 modification at comparable temperatures leads to the compound NbO 2.44 which is also metastable. The electron optical investigation shows that the reaction products have “block structures” which are heavily disordered. Typical structural defects recognizable in the products of both types of reactions are a “zipper-like” sequence of blocks, connections with R-tyue tunnels and characteristic structural elements of the initial structure of the metastable Nb 2O 5 modification. An irregular sequence of structural elements of Nb 12O 29 and Nb 25O 62 is characteristic of NbO 2.44.
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