Yb^3＋ and Er^3＋ co-doped BaBi4Ti4015 （BBT） ceramic samples showed brighter up-conversion photoluminescence （UC-PL） under excitation of 980 nm. The monotonous increase of fluorescence intensity ratio （FIR） from...Yb^3＋ and Er^3＋ co-doped BaBi4Ti4015 （BBT） ceramic samples showed brighter up-conversion photoluminescence （UC-PL） under excitation of 980 nm. The monotonous increase of fluorescence intensity ratio （FIR） from 525 to 550 nm with temperature showed that this material could be used for temperature sensing with the maximum sensitivity to be 0.0046 KI and the energy dif- ference was 700 cm-1. Moreover, the sudden change of red and green emissions around 400 ℃might imply a phase transition. With increasing pressure up to 4 GPa, the PL intensity decreased but was still strong enough. These results illustrated the wide applications of BBT in high temperature and high pressure conditions.展开更多
通过传统固相法合成了具有超晶格结构的Ba Bi_(8)Ti_(7-x)(Cu_(1/3)Nb_(2/3))_(x)O_(27)(简称:BBT-BIT-x(Cu_(1/3)Nb_(2/3))共生陶瓷。结果表明,BBT-BIT-x(Cu_(1/3)Nb_(2/3))陶瓷的电学性能得到了有效地改善:随着x的增加,介电损耗呈现...通过传统固相法合成了具有超晶格结构的Ba Bi_(8)Ti_(7-x)(Cu_(1/3)Nb_(2/3))_(x)O_(27)(简称:BBT-BIT-x(Cu_(1/3)Nb_(2/3))共生陶瓷。结果表明,BBT-BIT-x(Cu_(1/3)Nb_(2/3))陶瓷的电学性能得到了有效地改善:随着x的增加,介电损耗呈现先减小后增大的趋势,居里温度逐渐增加(Tc:483~494℃);压电常数和剩余极化强度都呈现出先增大后减小的趋势,其中x=0.035时压电常数和剩余极化强度同时达到最高值分别为d_(33)=18 p C/N,2P_(r)=16.5μC/cm^(2)。此外,BBT-BIT-0.035(Cu_(1/3)Nb_(2/3))陶瓷具有良好的热稳定性,在400℃/0.5 h下压电常数仍有14 p C/N,是起始值的82.4%,这有利于在较高温度的环境下工作。展开更多
基金Project supported by Fund for Fostering Talents in Basic Science of the National Natural Science Foundation of China(J1103207)the National Natural Science Foundation of China(11274288,21002097)+1 种基金the National Basic Research Program of China(2011CB932801,2012CB933702)Ministry of Education of China(20123402110034)
文摘Yb^3＋ and Er^3＋ co-doped BaBi4Ti4015 （BBT） ceramic samples showed brighter up-conversion photoluminescence （UC-PL） under excitation of 980 nm. The monotonous increase of fluorescence intensity ratio （FIR） from 525 to 550 nm with temperature showed that this material could be used for temperature sensing with the maximum sensitivity to be 0.0046 KI and the energy dif- ference was 700 cm-1. Moreover, the sudden change of red and green emissions around 400 ℃might imply a phase transition. With increasing pressure up to 4 GPa, the PL intensity decreased but was still strong enough. These results illustrated the wide applications of BBT in high temperature and high pressure conditions.
文摘通过传统固相法合成了具有超晶格结构的Ba Bi_(8)Ti_(7-x)(Cu_(1/3)Nb_(2/3))_(x)O_(27)(简称:BBT-BIT-x(Cu_(1/3)Nb_(2/3))共生陶瓷。结果表明,BBT-BIT-x(Cu_(1/3)Nb_(2/3))陶瓷的电学性能得到了有效地改善:随着x的增加,介电损耗呈现先减小后增大的趋势,居里温度逐渐增加(Tc:483~494℃);压电常数和剩余极化强度都呈现出先增大后减小的趋势,其中x=0.035时压电常数和剩余极化强度同时达到最高值分别为d_(33)=18 p C/N,2P_(r)=16.5μC/cm^(2)。此外,BBT-BIT-0.035(Cu_(1/3)Nb_(2/3))陶瓷具有良好的热稳定性,在400℃/0.5 h下压电常数仍有14 p C/N,是起始值的82.4%,这有利于在较高温度的环境下工作。
