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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)和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PMN-0.26PT和掺锰PMN-0.26PT单晶的本征热释电系数分别达到15.3×10-4 C/m2 K和17.2×10-4 C/m2 K,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0.000 5,使得Mn掺杂PMN-0.26PT单晶的探测优值从15.3×10-5 Pa-1/2提高至40.2×10-5 Pa-1/2,Mn掺杂PIMNT的探测优值达到19.5×10-5 Pa-1/2。高Curie温度(TC)PIMNT(41/17/42)和Mn掺杂PIMNT(23/47/30)单晶的TC分别达到253℃和179℃。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4Hz和10Hz时分别达到3.0×109 cm·Hz1/2/W和2.21×109 cm·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。
Relaxor ferroelectric single crystal lead magnesium niobate-lead titanate (PMNT), Mn-doped PMNT, ternary lead niobium indium lead-lead niobate-lead titanate (PIMNT) and Mn- Excellent piezoelectric properties, but also has very good pyroelectric performance. Through the study of dielectric and pyroelectric properties of the relaxed ferroelectric single crystal with the composition of solid solution and the crystallographic orientation, it was found that the [111] oriented PMN-0.26PT and the Mn-doped PMN-0.26PT single crystal The coefficient of pyroelectricity is 15.3 × 10-4 C / m2 K and 17.2 × 10-4 C / m2 K, respectively. It has excellent comprehensive performance of pyroelectric. After doping, the dielectric loss of binary and ternary system relaxed ferroelectric single crystal is reduced to 0.0005, making the detection value of Mn-doped PMN-0.26PT single crystal from 15.3 × 10-5 Pa-1/2 To 40.2 × 10-5 Pa-1/2, the detection value of Mn-doped PIMNT reached 19.5 × 10-5 Pa-1/2. TC at high Curie temperature (TC) PIMNT (41/17/42) and Mn-doped PIMNT (23/47/30) single crystals reached 253 ° C and 179 ° C, respectively. A high performance pyroelectric detector based on Mn-doped PMNT single crystal was prepared by using multiwalled carbon nanotubes with higher infrared absorption as the absorbing layer. The voltage response of the detector reached 115kV / W (10Hz) The rate of which reached 3.0 × 109 cm · Hz1 / 2 / W and 2.21 × 109 cm · Hz1 / 2 / W respectively at 4Hz and 10Hz, which is four times higher than that of commercially available high performance LiTaO3 detectors. The relaxation Ferroelectric single crystal linear array infrared detectors also show significant performance advantages.