Spark Plasma Sintering and Hot Pressing of Hetero‐Doped LaNbO4

$48.00 plus tax (Refund Policy)

Download / Buy Article:

Abstract:

LaNbO4/La3NbO7 and LaNbO4/LaNb3O9 cer‐cer composites were prepared by impregnating Ca‐doped LaNbO4 powder, synthesized by spray pyrolysis, with La‐ or Nb‐precursor solutions. The sintering of the calcined powders was investigated by dilatometry, and dense composites were prepared by conventional sintering, hot pressing, and spark plasma sintering. The particle size of the starting powders was about 50 nm, and the average grain size of the dense materials ranged from 100 nm and upwards, depending on the sintering temperature, sintering procedure, and the phase composition. The unit cell parameters of LaNbO4 showed a finite size effect and approached the cell parameters of tetragonal LaNbO4 with decreasing crystallite size, both for the single‐phase material and the composites. The minority phase (La3NbO7 or LaNb3O9) were observed as isolated grains and accumulated at triple points and not along the grain boundaries, pointing to a large dihedral angle between the phases. The calcium‐solubility in the minority phases was larger than in LaNbO4, which corresponds well with previous reports. The electrical conductivity of the hetero‐doped materials was similar to, or lower than, that for Cadoped LaNbO4.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2012.05101.x

Publication date: May 1, 2012

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more