【公開日：2024.07.25】【最終更新日：2024.06.29】

課題データ / Project Data

課題番号 / Project Issue Number

23UT0318

利用課題名 / Title

Ceramics processing

利用した実施機関 / Support Institute

東京大学 / Tokyo Univ.

機関外・機関内の利用 / External or Internal Use

内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)

技術領域 / Technology Area

【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-

【重要技術領域 / Important Technology Area】（主 / Main）次世代ナノスケールマテリアル/Next-generation nanoscale materials（副 / Sub）-

キーワード / Keywords

YSZ、単結晶,X線回折/ X-ray diffraction

利用者と利用形態 / User and Support Type

利用者名（課題申請者）/ User Name (Project Applicant)

YOO KYUNGHYEON

所属名 / Affiliation

東京大学　大学院工学系研究科

共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes

ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes

利用形態 / Support Type

（主 / Main）機器利用/Equipment Utilization（副 / Sub）-

利用した主な設備 / Equipment Used in This Project

UT-203：粉末X線回折装置
UT-204：粉末X線回折装置

報告書データ / Report

概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)

Yttria stabilized zirconia (YSZ) has various phases, such as monoclinic, tetragonal, and cubic. Its phase depends on the Y concentration and heating temperature. Tetragonal YSZ, especially for the 3YSZ (3 mol% Yttria contained zirconia), has been widely used due to its mechanical properties. However, it is metastable in humid conditions at room temperature. Also, it is hard to make a single crystal due to this instability. In this study, we trying to make a single crystal 3YSZ.  To make a 3YSZ single crystal, we use the cubic 10YSZ single crystal, controlling the Y contents. In the first step of this study, we identify the structural changes for 10YSZ cubic single crystal during annealing using XRD data.

実験 / Experimental

The 10YSZ single crystal growing along the (1 1 0) direction was purchased commercially. First, we check its original structure using XRD. After that, we covered the 10YSZ single crystal with the 0YSZ powder to give a Y-diffusion environment. To cover the 10YSZ, we conducted two different ways: buried with the 0YSZ powder and made the pellet with pressing (68.6MPa). The covered materials were annealed at 1600 degrees for 30 hours to induce the Y-diffusion. Further XRD was conducted to identify the phase transition with the Kalpha machine.

結果と考察 / Results and Discussion

The XRD data for the 10YSZ single crystal is shown in Figure 1. This figure revealed two peaks at 50.12 degrees and 50.2 degrees. The highest peak is related to the (2 2 0) plane of cubic YSZ. The lower peak near 50.2 degrees reveals that this single crystal contains a small amount of tilted grain. However, it also shows the possibility of a tetragonal phase. Therefore, we need to characterize the crystal structure of 10YSZ further.  After that, we will conduct heat treatment and check whether the phase transition occurred. 

図・表・数式 / Figures, Tables and Equations

Figure1_XRD result of 10YSZ single crystal

その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)

成果発表・成果利用 / Publication and Patents

論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)

口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.

特許 / Patents

特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件