T.Yu
,
D.S.Wang
,
D.Wu
金属学报(英文版)
The hysteresis loop changes of ferroelecric SrBi2 Ta2 O9 (SBT) thin films (330nm) vsthe temperature of forming gas (5%o hydrogen+95%o nitrogen) annealing were measuredwhen the annealing time was 1min and 10min. The selected annealing temperaturewas at 100℃, 200℃, 250℃, 300℃, 350℃, 400℃ and 4S0℃, respectively. Our resultsshowed that the ferroelectric properties were easily destroyed and the leakage currentchanged abruptly when the SBT thin films were in their ferroelectric phase (＜270℃).The space charges at the grain boundary may take an important role in absorptionpolarity molecular hydrogen when the SBT thin films were in the ferroelectric phase.The oxygen recovery experiments were also performed and investigated in this work.
关键词:
ferroelectric
,
null
,
null
,
null
D.S. Wang
金属学报(英文版)
The degradation behavior of SrBi2 Ta2O9 (SBT) thin filras annealed in forming gas (5%H2+95%N2) was investigated. The ferroelectric remnant polarization Pr of SBT had a severe decrease in the containing H2 atmosphere at 400℃. SEM results showed that Bi could be reduced from SBT thin films for the effect of H2. The reduction role increased with a rise of annealing temperature. SBT thin films lost their ferroeb ctric- ity when the annealing temperature was above 450℃. It implied that the degradation of Pr value or the disappearance of ferroelectricity in SBT thin films had the relationship with the reductive amounts of Bi in SBT. H2 played an important role in degradation of ferroelectric SBT thin films. This role could be attributed to its strong reduction activity during forming gas annealing.
关键词:
ferroelectric
,
null
,
null
钟世兴
,
蔡苇
,
符春林
,
刘凯华
硅酸盐通报
锆钛酸铅材料因具有优异的介电、压电和铁电性被广泛用于制作电容器、压电器件和铁电随机存储器等功能器件.本文综述了锆钛酸铅铁电薄膜材料中锆钛比、掺杂种类及掺量对其介电性和铁电性的影响,并提出了亟待解决的问题.
关键词:
锆钛酸铅
,
组成
,
掺杂
,
介电
,
铁电
蔡苇
,
符春林
,
胡文广
,
邓小玲
,
陈刚
人工晶体学报
采用微波烧结法制备铁酸铋多铁陶瓷,研究了微波烧结时间对其显微结构、介电性和铁电性的影响.结果表明:在4 kW下烧结35～40 min制备出基本为纯相的铁酸铋陶瓷；随烧结时间增加,铁酸铋陶瓷结构越来越致密,晶粒尺寸有一定程度增大；在-10～90℃范围内,介质损耗随烧结时间增加而增大；随微波烧结时间增加,剩余极化强度增大,而矫顽场强先增加后减小,且铁电性具有明显的频率依赖性；铁酸铋陶瓷的漏电流随微波烧结时间增加而减小,这是结构致密化的结果.
关键词:
铁酸铋
,
微波烧结
,
介电
,
铁电
向炼
,
陈刚
,
符春林
,
蔡苇
,
李小双
,
宋云霞
人工晶体学报
采用固相法制备了Nb2Sr2-xYxO7陶瓷.研究了掺Y对陶瓷的晶体结构、表面形貌、铁电、介电和压电性能的影响.研究结果表明:钇掺杂Sr2 Nb2 O7陶瓷,Y3+取代了A位Sr2+,形成Nb2 Sr2-xYxO7固溶体,并提高了铌酸锶陶瓷铁电、介电和压电性能.在x=0.05时,Nb2 Sr2-xYxO7陶瓷的铁电性能达到最大(剩余极化强度Pr=0.254μC/cm2);在x=0.1时,Nb2Sr2-xYxO7陶瓷的介电性能达到最大(相对介电常数εr=90,介电损耗tarδ≤0.01).
关键词:
铌酸锶
,
压电陶瓷
,
铁电
,
介电
,
压电
钟志成
,
韩祥云
,
胡界博
,
杨凤霞
,
郑克玉
,
吉向东
材料科学与工艺
以Nb_2O_5和Ta_2O_5为前驱反应物,KOH为矿化剂,采用异丙醇和水为反应介质的混合溶剂热法,成功地合成了四方相、钙钛矿结构的KTa_(0.6)Nb_(0.4)O_3陶瓷粉体.XRD、SEM、TEM以及FT-IR等研究结果表明:在混合溶剂热合成过程中,反应溶剂(水/异丙醇)、矿化剂KOH的摩尔浓度和反应温度是影响KTN粉体结构和形貌的关键因素.在KOH浓度1～2M,异丙醇:水=80:20、反应温度250℃,时间8h合成条件下,得到了晶粒形状呈规则的立方体,边长分布约为100～300hm的KTN陶瓷粉体.
关键词:
KTN粉体
,
混合溶剂热
,
合成
,
表征
包勇
,
张德银
材料科学与工程学报
为提升钽酸锂薄膜的性能,提出一种离子束增强沉积法制备钽酸锂薄膜的新工艺.分别采用这种新工艺和溶胶-凝胶法制备了钽酸锂薄膜,并利用阻抗分析仪和铁电材料分析仪对制备样品进行了介电性能、铁电特性、漏电电流和热释电特性分析.实验结果表明,采用离子束增强沉积制备的钽酸锂样品经550℃退火后,介电常数为39.44,介电损耗为0.045;测试电场强度为400kV/cm时,漏电流为4.76×10-8 A/cm2,击穿场强为680kV/cm,热释电系数达到1.82×10-4/m2K.相比之下,采用溶胶-凝胶方法制备的钽酸锂薄膜样品,其介电常数、介电损耗、漏电流都更大,击穿场强和热释电系数更低.从电性能参数比较可以看出,离子束增强沉积法比溶胶-凝胶法更适合用于制备钽酸锂薄膜.
关键词:
离子束增强沉积
,
钽酸锂
,
溶胶-凝胶
,
介电常数
,
铁电特性
,
热释电系数
木村秀夫
,
赵洪阳
,
姚启文
,
程振祥
,
王小林
人工晶体学报
在工业发展的进程中,氧化物材料在电子学领域中应用最为广泛.到目前为止,即使是对于氧化物晶体材料,从纳米科技角度来说,研究的趋势是降低尺寸直到很小的尺度.近年来,氧化物的研究目标也发生了显著的变化.本文介绍了作者课题组的与氧化物晶体及薄膜有关的三个研究方向.
关键词:
体晶体
,
薄膜
,
压电性
,
铁电性
,
多铁性
,
光催化
