Enhancement of Mechanical Hardness in SnOxNy with a Dense High-Pressure Cubic Phase of SnO2
- Authors
- Gwon, Hyo Jin; Kang, Na-Ri; Lee, Yunju; Won, Sung Ok; Chang, Hye Jun; Choi, Ji-Won; Kang, Chong-Yun; Kim, Seon Keun; Kwon, Beomjin; Nahm, Sahn; Kim, Ju-Young; Kim, Jin-Sang; Baek, Seung-Hyub
- Issue Date
- 11-10월-2016
- Publisher
- AMER CHEMICAL SOC
- Citation
- CHEMISTRY OF MATERIALS, v.28, no.19, pp.7051 - 7057
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY OF MATERIALS
- Volume
- 28
- Number
- 19
- Start Page
- 7051
- End Page
- 7057
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/87185
- DOI
- 10.1021/acs.chemmater.6b02888
- ISSN
- 0897-4756
- Abstract
- Controlling crystalline phases in polymorphic materials is critical not only for the fundamental understanding of the physics of phase formation but also for the technological application of forbidden, but potentially useful physical properties of the nominally unstable phases. Here, using tin oxide (SnO2) as a model system, we demonstrate a new way to enhance the mechanical hardness of an oxide by stabilizing a high-pressure dense phase through nitrogen integration in the oxide. Pristine SnO2 has a tetragonal structure at the ambient pressure, and undergoes phase transitions to orthorhombic and cubic phases with increasing pressure. Leveraging the enhanced reactivity of nitrogen in plasma, we are able to synthesize tin oxynitride (SnON) thin films with a cubic phase same as the high-pressure phase of SnO2. Such nitrogen-stabilized cubic SnON films exhibit a mechanical hardness of similar to 23 +/- 4 GPa, significantly higher than even the nitride counterpart (Sn3N4) as the result of the shortened atomic distance of the denser, high-pressure cubic phase. Moreover, SnON has a heavily doped, n-type semiconducting property with a controllable optical bandgap. Our work will provide new opportunities to search for and to utilize beneficial, but hidden physical properties that exist in a particular phase stable only at extreme conditions.
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Collections - Graduate School > KU-KIST Graduate School of Converging Science and Technology > 1. Journal Articles
- College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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