DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Chung, Sung-Yoon | - |
dc.contributor.advisor | 정성윤 | - |
dc.contributor.author | Ko, Seok-Young | - |
dc.contributor.author | 고석영 | - |
dc.date.accessioned | 2017-03-29T02:46:47Z | - |
dc.date.available | 2017-03-29T02:46:47Z | - |
dc.date.issued | 2016 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663142&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/222231 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 신소재공학과, 2016.8 ,[vii, 110 p. :] | - |
dc.description.abstract | Piezoelectric materials, which allow interconversion between electrical and mechanical energy, are widely used for various electronic devices. Lead-containing piezoelectric materials still dominate the commercial market owing to their excellent piezoelectric performance. However, the toxicity of lead with respect to the environment and human health has led to a demand for alternative eco-friendly materials. Therefore, several lead-free systems have been studied in depth as potential lead-free piezoelectric candidate materials, in particular, the $(Na_{1/2}Bi_{1/2})TiO_3-BaTiO_3-(K_{1/2}Na_{1/2})NbO_3$ (NBT-BT-KNN) system has excellent inverse piezoelectric properties. Piezoelectric properties are sensitively affected by their crystallographic orientation and therefore these parameters can be maximized by producing of single crystals with a particular orientation. Conventionally, single crystals have been fabricated from a liquid or a vapor. However, these melting methods would be inappropriate for fabricating lead-free single crystals because it is difficult to guarantee chemical homogeneity of single crystals produced in this manner. In addition, most of the lead-free piezoelectric materials contain volatile elements such as K, Bi, Na, etc. and have a complex chemical composition, and thus the fabrication of single crystals is more difficult. These problems can be overcome by the solid-state single crystal growth (SSCG) method developed by our group. Because single crystals grow via solid-state conversion of polycrystals into single crystals at low temperature, the chemical homogeneity and volatile elements at the A-site of the perovskite can be maintained effectively. The solid-state conversion of single crystals from polycrystals is based on a microstructural evolution principle, and therefore it is necessary to understand the principle first. In this thesis, we produced lead-free NBT-BT-KNN single crystals based on the principle of microstructural evolution. The produced single crystals exhibited excellent piezoelectric properties. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | lead-free materials | - |
dc.subject | microstructural evolution principle | - |
dc.subject | incipient piezoelectric | - |
dc.subject | single crystal | - |
dc.subject | solid-state conversion | - |
dc.subject | 비연계 | - |
dc.subject | 입자성장이론 | - |
dc.subject | 초기압전재료 | - |
dc.subject | 단결정 | - |
dc.subject | 고상단결정성장법 | - |
dc.title | Microstructure control and enhancement of piezoelectric properties via solid-state conversion of high quality single crystals in the $(Na_{1/2}Bi_{1/2})TiO_3-BaTiO_3-(K_{1/2}Na_{1/2})NbO_3$ System | - |
dc.title.alternative | $(Na_{1/2}Bi_{1/2})TiO_3-BaTiO_3-(K_{1/2}Na_{1/2})NbO_3$ 계에서 미세구조 제어 및 고품질의 고상단결정 제조를 통한 압전특성 향상 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :신소재공학과, | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.