Structural and low temperature electrical transport properties of Mo-doped vanadium oxide NTC ceramic thin films
- Title
- Structural and low temperature electrical transport properties of Mo-doped vanadium oxide NTC ceramic thin films
- Author
- 엄석기
- Keywords
- NTC oxide thin film ceramics; Mo-doped vanadium oxides; Mo concentration; N-2 annealing process; Phase characterization; Electrical properties
- Issue Date
- 2017-02
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v. 695, page. 1770-1777
- Abstract
- Mo doped V2O3 [V1-xMoxO2-x/2(x - 0, 0.5-1)] ceramic thin films were prepared on metal substrates by sol-gel dip coating and the influence of Mo addition on their microstructure, negative temperature coefficient (NTC) electrical transport properties and metal to insulator phase transition behavior were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), and resistance-temperature measurements. Resistivity-temperature curves (over a temperature range of 273.15-253.15 K) indicated that all of the prepared thin films have NTC effects, after annealing with 20 sccm N-2 at 673.15 K. It was demonstrated through microstructure analysis at Mo high concentration, (i.e., x > 0.07) it segregates at the V2O3 grain boundaries, causing scattering and distortion of the crystal lattice. Compared with the other V2O3 films, the films prepared at Mo x > 0.07 offered the high resistivity and moderate thermal constant (B) values. In particular, V2O3 doped with 10 mol % Mo showed excellent NTC properties and high resistivity (0.072 Omega cm). At sub-zero temperatures, the variation of electrical transport properties of the V2O3 films is correlated with Mo concentration, micro-structure and Joule effect. (C) 2016 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/abs/pii/S092583881633465X?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/112666
- ISSN
- 0925-8388; 1873-4669
- DOI
- 10.1016/j.jallcom.2016.11.007
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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