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Space Charge Signature and Its Effects on Ionic Transport in Heterogeneous Solids
Author(s) -
Kumar Binod,
Thokchom Joykumar S.
Publication year - 2007
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.1551-2916.2007.01877.x
Subject(s) - space charge , ion , lithium (medication) , dielectric , materials science , arrhenius plot , titanium , analytical chemistry (journal) , ionic bonding , adsorption , arrhenius equation , inorganic chemistry , chemistry , chemical physics , activation energy , electron , physics , medicine , optoelectronics , organic chemistry , quantum mechanics , chromatography , metallurgy , endocrinology
The Arrhenius plots of heterogeneous solids comprising of lithium aluminum titanium phosphate (LATP) glass–ceramic, Al 2 O 3 , and Ba 0.6 Sr 0.4 TiO 3 (0.6 BST) exhibit an inflection or peak around 27°C, which is interpreted as a signature of space charge. The space charge is formed by the adsorption of lithium ions onto the dielectric phases below 27°C. The space charge is also a source of an electric field, which influences the transport of conducting ions. The adsorbed ions are desorbed above 27°C, resulting in a reduction or elimination of the space charge effect. A high dielectric constant phase, 0.6 BST, retains the space charge effect even at temperatures greater than 27°C.