Open AccessSuppression of Field Crystallization of Anodic Niobia by Oxygen
Author(s) -
H. Habazaki,
T. Ogasawara,
H. Konno,
Kenichi Shimizu,
Shigekazu Nagata,
K. Asami,
K. Takayama,
P. Skeldon,
G.E. Thompson
Publication year - 2006
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1.2184909
Subject(s) - crystallization , nucleation , materials science , substrate (aquarium) , chemical engineering , crystal (programming language) , oxygen , anodizing , amorphous solid , crystal growth , inorganic chemistry , chemistry , crystallography , metallurgy , aluminium , organic chemistry , geology , oceanography , computer science , engineering , programming language
Solid-solution Nb–O films containing up to 50 atom % oxygen, prepared by magnetron sputtering, were used to investigate the influence of the oxygen on field crystallization during anodizing at 100 V in 0.1 mol dm(-3) ammonium pentaborate electrolyte at 333 K. The findings reveal that field crystallization is hindered dramatically by addition of 20 atom % oxygen to the substrate, while no crystallization occurs for a Nb–50 atom % O substrate. Prior thermal treatment accelerates field crystallization of niobium, but not the Nb–50 atom % O substrate. The thermal treatment is considered to promote generation of precursor sites for crystal nucleation. However, sufficient oxygen in the substrate may restrict precursor development and/or reduce the compressive stresses in the amorphous anodic niobia that can facilitate crystal growth
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom