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| 1 | (Ca,Ta)共掺杂Ti O_(2)陶瓷巨介电性能及机理显示文摘随着社会的飞速发展,微电子器件的功能不断向一体化方向发展,使开发具有高介电常数、低介电损耗、良好频率和温度稳定性的高介电陶瓷受到越来越多的关注。本工作通过固相反应烧结法制备了(Ca,Ta)共掺杂的TiO_(2)陶瓷。采用X射线衍射仪(XRD)、扫描电镜(SEM)及能谱分析仪(EDS)、阻抗分析仪、X射线光电子能谱(XPS)等对(Ca,Ta)共掺杂的TiO_(2)陶瓷性能进行分析研究。结果表明,不同掺杂量的(Ca1/3Ta2/3)_(x )Ti_(O_(1-x))O_(2)陶瓷表面形貌致密度良好,且随掺杂量增加TiO_(2)的(110)主峰逐渐向小角度移动。当x≥7%时,(Ca1/3Ta2/3)_(x) Ti_(O_(1-x))O_(2)陶瓷样品出现CaTi4O9和CaTa4O11。与纯TiO_(2)相比,不同掺杂量的(Ca1/3Ta2/3)_(x) Ti_(O_(1-x))O_(2)陶瓷皆具有巨介电常数;随掺杂量的不断增加,介电常数先升高后降低,但介电损耗变化趋势相反。当掺杂量x=3%时,(Ca1/3Ta2/3)_(x )Ti_(O_(1-x))O_(2)陶瓷获得相对较优异的性能,在1 kHz下,非线性系数高达7.3,这主要是由于Ta5+掺杂使材料内部产生电子,Ca2+掺杂提高了材料内部空位的产生,产成的缺陷偶极子簇可以提高介电性能。 | 崔冰 陈继 杨在志 赵伟雨 邓玉军 郁倩 刘娟 徐东 | 2021 | 过程工程学报2021，21，2： | 0 |
| 2 | NUV-pumped luminescence of thermally stable samarium-activated alkali metal borophosphate phosphor显示文摘Exploring outstanding rare-earth activated inorganic phosphors with good thermostability has always been a research focus for high-power white light-emitting diodes(LEDs).In this study,we report a Sm^(3+)-activated KNa_(4)B_(2)P_(3)O_(13)(KNBP)powder phase.Its particle morphology,photoluminescence properties,concentration quenching mechanism,thermal quenching mechanism,and chromatic properties are demonstrated.Upon the near-ultraviolet(NUV)irradiation of 402 nm,the powder phase exhibits orange-red visible luminescence performance,originating from typical ^(4)G_(5/2)→^(6)H_(J/2)(J=5,7,9)transitions of Sm^(3+).Importantly,the photoluminescence performance has good thermostability,low correlated color temperature(CCT),and high color purity(CP),indicating its promising application in the NUV-pumped warm white LEDs. | Zhenyu FANG Dan YANG Youkui ZHENG Jialiang SONG Tongsheng YANG Ruitong SONG Yuefei XIANG Jing ZHU | 2021 | Journal of Advanced Ceramics2021，10，5： | 0 |
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