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新型热释电材料性能及其在红外探测器中的应用
作者:李龙 许晴 赵祥永 罗豪甦 
单位:中国科学院上海硅酸盐研究所 上海201800 
关键词:弛豫铁电单晶 热释电性能 探测优值 多壁碳纳米管 
分类号:O799
出版年,卷(期):页码:2014,42(4):423-431
DOI:10.7521/j.issn.0454-5648.2014.04.01
摘要:

弛豫铁电单晶铌镁酸铅­­钛酸铅(PMNT)Mn掺杂PMNT,三元系铌铟酸铅­­铌镁酸铅­­钛酸铅(PIMNT)Mn掺杂PIMNT)不仅具有优异的压电性能,而且还具有非常优异的热释电性能。通过对弛豫铁电单晶的介电、热释电性能随固熔体组成、结晶学取向的研究,发现了[111]取向的PMN­0.26PT和掺锰PMN­0.26PT单晶的本征热释电系数分别达到15.3×10­4C/m2K17.2×10­4C/m2K,具有优异的热释电综合性能。掺杂后,二元和三元体系弛豫铁电单晶的介电损耗降至0.0005,使得Mn掺杂PMN­0.26PT单晶的探测优值从15.3×10­5Pa­1/2提高至40.2×10­5Pa­1/2Mn掺杂PIMNT的探测优值达到19.5×10­5Pa­1/2。高Curie温度(TC)PIMNT (41/17/42) Mn掺杂PIMNT (23/47/30) 单晶的TC分别达到253179。采用红外吸收率更高的多壁碳纳米管作为吸收层,制备了基于Mn掺杂PMNT单晶的高性能热释电探测器,该探测器的电压响应率达到115kV/W (10Hz),探测率在4Hz10Hz时分别达到3.0×109cm·Hz1/2/W2.21×109cm·Hz1/2/W,性能比目前商用的高性能LiTaO3探测器要高出4倍之多,弛豫铁电单晶线阵红外探测器也显示出了明显的性能优势。

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Relaxor-based ferroelectric single crystals (i.e., lead magnesium niobate-lead titanate(PMNT), Mn-doped PMNT, ternary lead indium niobate-lead magnesium niobate-lead titanate (PMNT) and Mn-doped PIMNT) exhibit a high piezoelectric performance and superior pyroelectric properties. The pyroelectric coefficients of 15.3×10-4 C/m2K and 17.2×10.4 C/m2K were obtained for PMN-0.26PT and Mn-doped PMN-0.26PT, respectively. The dielectric loss of binary and ternary relaxor-based single crystals decreases from 0.3% to 0.05% due to Mn ions doping, enhancing the detectivity figure of merit (Fd) from 15.3×10-5 Pa-1/2 to 40.2×10-5 Pa-1/2 for Mn-doped PMN-0.26PT. The Fd of Mn-PIMNT (23/47/30) is 19.5×10-5 Pa-1/2. Furthermore, the Curie temperature is 253 for PIMNT (41/17/42) and 179 for Mn-doped PIMNT (23/47/30), respectively. By using the Mn-doped PMNT single crystals as sensitive element and multi-walled carbon nanotubes as absorbing layer, we can obtain the superior infrared detector. The specific detectivity of Mn-doped PMNT-based detector is 3.0×109cm·Hz1/2/W at 4 Hz and 2.21×109cm·Hz1/2/W at 10 Hz, respectively, which are four times greater than that of LiTaO3-based detector.

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基金项目:
基金项目:国家“973”计划(2013CB632902--3, 2009CB623305, 2013CB6329052,2013CB632906);国家自然科学基金(61001041, 11090332,51272268);上海市科委(12DZ0501000);中科院上海技术物理所开发课题(IIMDKFJJ-11-08);上海硅酸盐研究所创新基金(Y29ZC4140G,Y39ZC4140G);上海市电力公司(52091413502W)。
作者简介:
第一作者:李 龙(1988—),男,博士研究生。 通信作者:罗豪甦(1959—),男,博士,教授。
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