TY - JOUR
T1 - Annealing environment dependent electrical and chemical state correlation of Li-doped NiO
AU - Yang, Seojin
AU - Kim, Jiwoong
AU - Choi, Yesul
AU - Kim, Hyegyeong
AU - Lee, Dooyong
AU - Bae, Jong Seong
AU - Park, Sungkyun
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/30
Y1 - 2020/1/30
N2 - The effects of annealing environments and dopants on the structural, chemical, optical, and electrical properties of NiO are investigated. Pristine NiO exhibits electrically insulating behavior regardless of the annealing environments (e.g., vacuum and O2 environments). On the other hand, Li-doped NiO exhibits electrical resistivities of ∼350 Ω cm and ∼9 Ω cm for the ceramics annealed under vacuum and O2, respectively with reduced optical band-gap. The structural analysis revealed that all the samples exhibit a cubic structure (Fm-3m, SG 225) without any measurable secondary phases. However, Li-doped NiO samples showed a reduction in the unit cell volume as compared to the undoped NiO samples. X-ray photoelectron spectroscopy revealed different residual Li content depending on the annealing environments, and the presence of induced Ni3+ state in the Li-doped NiO. These induced Ni3+ states and doped Li are responsible for the observed change in the structural and electrical properties of the Li-doped NiO samples.
AB - The effects of annealing environments and dopants on the structural, chemical, optical, and electrical properties of NiO are investigated. Pristine NiO exhibits electrically insulating behavior regardless of the annealing environments (e.g., vacuum and O2 environments). On the other hand, Li-doped NiO exhibits electrical resistivities of ∼350 Ω cm and ∼9 Ω cm for the ceramics annealed under vacuum and O2, respectively with reduced optical band-gap. The structural analysis revealed that all the samples exhibit a cubic structure (Fm-3m, SG 225) without any measurable secondary phases. However, Li-doped NiO samples showed a reduction in the unit cell volume as compared to the undoped NiO samples. X-ray photoelectron spectroscopy revealed different residual Li content depending on the annealing environments, and the presence of induced Ni3+ state in the Li-doped NiO. These induced Ni3+ states and doped Li are responsible for the observed change in the structural and electrical properties of the Li-doped NiO samples.
KW - Annealing environment
KW - Chemical states
KW - Li-doped NiO
UR - http://www.scopus.com/inward/record.url?scp=85072642273&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.152343
DO - 10.1016/j.jallcom.2019.152343
M3 - Article
AN - SCOPUS:85072642273
SN - 0925-8388
VL - 815
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 152343
ER -