【公開日：2024.07.25】【最終更新日：2024.05.10】

課題データ / Project Data

課題番号 / Project Issue Number

23NM5337

利用課題名 / Title

Single Crystal Growth of Oxides and Fluorides

利用した実施機関 / Support Institute

物質・材料研究機構 / NIMS

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）量子・電子制御により革新的な機能を発現するマテリアル/Materials using quantum and electronic control to perform innovative functions（副 / Sub）高度なデバイス機能の発現を可能とするマテリアル/Materials allowing high-level device functions to be performed

キーワード / Keywords

電子顕微鏡/ Electronic microscope,表面・界面・粒界制御/ Surface/interface/grain boundary control,セラミックスデバイス/ Ceramic device,光デバイス/ Optical Device

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)

ビジョラ ガルシア

所属名 / Affiliation

物質・材料研究機構

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

Dongsheng YUAN,Yueshen ZHOU,Joel MOREIRA

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）,技術補助/Technical Assistance

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

NM-650：卓上電子顕微鏡 [TM3000]

報告書データ / Report

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

(1) High-density Y(Ta_1-xNb_x)O₄ single crystals ranging from between pure YTaO₄ and YNbO₄ are grown by the floating zone technique to investigate their intrinsic scintillation performance.  (2) Pb-free (K_0.5Na_0.5)NbO₃ (KNN) ceramics are investigated as environmentally friendly alternatives to conventional Pb(Zr_xTi_1-x)O₃ (PZT) piezoelectric ceramics.

実験 / Experimental

(1) Single crystal growth by the floating zone technique.  (2) Reaction of raw materials in the molten state to get KNN. Pulverization and annealing recrystallization of KNN.

結果と考察 / Results and Discussion

(1) As the growth at the melting point ~ 2050^oC promotes slight evaporation from the floating zone, mainly due to some Ta-oxides evaporation, the deviation of the crystals' stoichiometry from the nominal composition was determined by EDX. The results are summarized in Fig. 1.  (2) The composition, crystallinity, and densification of piezoceramics critically determine their performance. The stoichiometry of KNN synthesized from the molten state, which leads to some alkali evaporation, was analyzed by EDX. The recrystallization process of the fine pulverized KNN powders, needed for the synthesis of high-density ceramics, was studied in terms of grain size and morphology by SEM, as shown in Fig. 2.

図・表・数式 / Figures, Tables and Equations

Fig. 1. Nb concentration determined by EDX versus nominal one.

Fig. 2. SEM images of KNN recrystallized at 800^oC (left) and 1000^oC (right).

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