Lead-free ferroelectric materials using alkali metal doped K-series fiber single crystals

采用碱金属掺杂K系列光纤单晶的无铅铁电材料

• 批准号: 21605012
• 负责人: KIMURA Hideo
• 金额: $ 3.08万
• 依托单位: National Institute for Materials Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21605012/
• 关键词: 強誘電体; 無鉛強誘電体; ファイバー単結晶; 複数元素添加; 希土類元素添加; 方位制御; インピーダンス; 誘電率; 低温・高温

Alkali metal(Na, Rb or Cs) doped KNbO_3 single crystals are grown using an original pulling down method in order to improve their composition change during a crystal growth. The composition change is improved by means of co-doping of small ionic size Na and large ionic size Rb or Cs into KNbO_3.Size of single crystals was 1-2 mm in diameter and 10-20 mm in length.Starting materials of RbCO_3 and CsCO_3 were easy to absorb moisture. When high purity carbonates were used,(KB)_4Nb_6O_17(B : Na, Rb or Cs) crystal part was formed on the crystal surface caused by absorbed moistures. For the crystal growth, better results were obtained when low purity carbonates were used. Impurity of low purity RbCO_3 and CsCO_3 was K and Na by EDX. Thus, a mish metal concept in rare earth elements is possible to apply in these systems.Their electric properties, such as the dielectric constant and the impedance, are changed depending on the doping ions, but almost the same values were obtained as well as KNbO_3.

为了改善晶体生长过程中的成分变化，采用传统的提拉法生长了碱金属（Na、Rb或Cs）掺杂KNbO_3单晶。采用小离子尺寸Na和大离子尺寸Rb或Cs共掺杂KNbO_3，改善了KNbO_3的组成变化，得到了直径1-2 mm，长度10-20 mm的单晶。当使用高纯碳酸盐时，由于吸收水分，在晶体表面形成（KB）_4Nb_6O_（17）（B：Na，Rb或Cs）晶体部分。对于晶体生长，当使用低纯度碳酸盐时获得较好的结果。低纯度RbCO_3和CsCO_3的EDX分析表明，杂质主要为K和Na。它们的介电常数和阻抗等电学性质随掺杂离子的不同而变化，但与KNbO_3的结果几乎相同。

项目成果

Li(Ga_<1-x> M_x) O_2(M : B or Al) single crystals grown by Floating zone method

浮区法生长Li(Ga_<1-x>M_x)O_2(M:B或Al)单晶

• 发表时间: 2010
• 期刊: Key Eng. Mater
• 作者: H. Kimura;R. Tanahashi and K. Maiwa
• 通讯作者: R. Tanahashi and K. Maiwa

CRYTAL GROWTH OF ALKALI METAL DOPED POTASSIUM NIOBATE FIBER SINGLE CRYSTALS

碱金属掺杂铌酸钾纤维单晶的晶体生长

• 发表时间: 2009
• 作者: H. Kimura;R. Tanahashi;H. Y. Zhao;K. Maiwa;Z. X. Cheng and X. L. Wang
• 通讯作者: Z. X. Cheng and X. L. Wang

Electric properties of alkali metal doped potassium niobate crystals

• DOI: 10.1016/j.ceramint.2011.04.061
• 发表时间: 2012
• 期刊: Ceramics International
• 影响因子: 5.2
• 作者: H. Kimura;R. Tanahashi;H. Y. Zhao;Q. Yao;Zhenxiang Cheng;Xiaolin Wang

Research progress on oxide crystals and thin films

氧化物晶体与薄膜研究进展

• 发表时间: 2011
• 期刊: J. Synthetic Crystals
• 作者: H. Kimura;H. Y. Zhao;Q. W. Yao;Z. X. Cheng;X. L. Wang
• 通讯作者: X. L. Wang

Recent applications of oxide single crystals and thin films

氧化物单晶和薄膜的最新应用

• 发表时间: 2009
• 作者: Pipat Ruankham;Jae-hyeong Lee;Lea Macaraig;Yueh-Tsung Tsai;Surawut Chuangchote;Takashi Sagawa;H. Kimura
• 通讯作者: H. Kimura