Premium
Characterization of Additive‐Modified Beta Alumina Ceramics by Nuclear Magnetic Resonance
Author(s) -
ROTH W. L.,
CHUNG INTAIK,
STORY H. S.
Publication year - 1977
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1977.tb15548.x
Subject(s) - non blocking i/o , materials science , ceramic , aluminium oxides , doping , beta (programming language) , conductivity , phase (matter) , mineralogy , chemical engineering , analytical chemistry (journal) , chemistry , composite material , organic chemistry , catalysis , optoelectronics , computer science , engineering , programming language
Sintered compacts of beta alumina have been made with additives of Li 2 O, MgO, NiO, CaO, and Y 2 O 3 . The motional narrowing and quadrupole interactions of sodium were investigated as a function of temperature and additive concentration by wide‐line NMR. The Li 2 O, MgO, and NiO additives are incorporated in the beta alumina structure and enhance Na motion; CaO dissolves and inhibits Na motion; and Y 2 O 3 forms a second phase and has no effect on the Na. The effects of the additives are explained by the size and charge of the additive cation, and intragranular and intergranular conductivity in doped beta alumina ceramics are predicted.