Premium
Direct Observation of the Double Schottky Barrier in Niobium‐Doped Barium Titanate by the Charge‐Collection Current Method
Author(s) -
Kataoka Noriyasu,
Hayashi Katsuro,
Yamamoto Takahisa,
Sugawara Yoshihiro,
Ikuhara Yuichi,
Sakuma Taketo
Publication year - 1998
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.1151-2916.1998.tb02576.x
Subject(s) - grain boundary , barium titanate , curie temperature , materials science , niobium , doping , condensed matter physics , schottky barrier , electrical resistivity and conductivity , current (fluid) , analytical chemistry (journal) , mineralogy , chemistry , optoelectronics , composite material , metallurgy , ceramic , electrical engineering , microstructure , physics , thermodynamics , ferromagnetism , chromatography , diode , engineering
Charge‐collection (CC) current was measured at a single grain boundary, which exhibited positive temperature coefficient of resistivity (PTCR) effects, in 0.1‐mol%‐Nb‐doped BaTiO 3 . The CC current systematically reversed across the grain boundary above the Curie point, which indicated the presence of a double Schottky barrier (DSB) at the grain boundary. In contrast, the CC current was constant across the grain boundary below the Curie temperature. The result obtained from the CC current measurement agrees with the classical DSB model in donor‐doped BaTiO 3 , indicating the PTCR effects.