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Synthesis and Characterization of Niobium Substituted Hexagonal Tungsten Bronzes
Author(s) -
Hussain A.,
UlMonir A.,
Murshed M. M._,
Rüscher C. H.
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200202)628:2<416::aid-zaac416>3.0.co;2-a
Subject(s) - niobium , tungsten , bronze , materials science , hexagonal crystal system , characterization (materials science) , metal , alkali metal , inorganic chemistry , absorption (acoustics) , analytical chemistry (journal) , crystallography , metallurgy , chemistry , nanotechnology , organic chemistry , chromatography , composite material
Alkali metal tungsten bronzes, M x WO 3 , and its niobium substituted forms, M x Nb y W 1‐y O 3 , have been prepared with M = K and Rb and nominal compositions of x = 0.20, 0.25, 0.30 and 0.0 ≤ y ≤ 0.20 at temperatures between 600 and 900?C. The X‐ray powder patterns reveal that single phases of niobium substituted hexagonal tungsten bronze (HTB) can be prepared for x = 0.2, y ≤ 0.05 ; x = 0.25, y ≤ 0.125 and x = 0.3, y ≤ 0.15. Investigations of the optical reflectivity and the infrared absorption of Rb 0.3 Nb y W 1‐y O 3 indicate a decreasing concentration of free carrier with increasing niobium content.