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国家自然科学基金(20571020)

作品数:14 被引量:25H指数:4
相关作者:郝素娥黄金祥李佳龙孙亮张巨生更多>>
相关机构:哈尔滨工业大学更多>>
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14 条 记 录,以下是 1-10
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Pr,Mn多元渗对BaTiO_3陶瓷结构与电性能的影响被引量:7
2007年
采用溶胶-凝胶法制备了纯BaTiO_3、Pr,Mn液相掺杂及气相多元扩渗改性的BaTiO_3陶瓷.研究结果表明,Pr掺杂能使纯BaTiO_3陶瓷的室温电阻率下降为1.01×10~5Ω·m;而Mn掺杂使室温电阻率升高为1.50×10^(13)Ω·m.但Pr和Mn的气相扩渗都能降低BaTiO_3陶瓷的室温电阻率至1.08×10~3Ω·m和1.29×10~5Ω·m.Pr-Mn共渗BaTiO_3陶瓷出现了典型的NTC效应.XRD分析表明,Pr或Mn掺杂并不能改变BaTiO_a陶瓷的物相结构,但经Pr-Mn共渗后,出现了新化合物BaMn_(0.12)Al_(1.88)O_4和Al_8Mn_4Pr的特征峰.XPS分析表明,气相多元渗使Pr,Mn,C元素都扩渗到陶瓷体内,并使各化学元素之间的结合更加牢固.SEM测试结果表明,Pr,Mn气相扩渗使陶瓷表面明显改观,晶粒生长完整,粒度分布均匀,气孔率下降.
郝素娥黄金祥张巨生王进福刘志刚
关键词:钛酸钡
Modification of Ag-doped BaTiO_3 powders through La gaseous penetration route
2010年
The Ag-doped BaTiO3(BATO) polycrystalline powders were fabricated by Sol-Gel method. Further modification by rare earth La was done through gaseous penetration route. Changes in constitution,structure,and electrical conductivity before and after modification of Ag and La were characterized. The acceptor dopant Ag owned the ability to decrease the resistivity of the doping samples from 4.30×109 Ω·m to 6.14×105 Ω·m where the resistivity fell by 4 orders of magnitude when the Ag doping ratio was 0.10%. And more doping of Ag enhanced the resistivity dramatically even beyond 2.0×107 Ω·m. Yet,gaseous penetration of La successively reduced the resistivity of BATO to the lowest point of 2.45×105 Ω·m. XRD analysis indicated that the doping process of Ag did not change the perovskite structure and main phases of the powders. However,new compound BaLa2O4 generated from complex reactions during the penetration process,which manifested that La3+ penetrated into the crystal lattices in the form of substituting the Ti4+ site. And this substitution strengthened the Ti-O bond,which led to the inhibition of blue shift in FTIR spectrum caused by doping of Ag. The morphology of La penetrated BATO powders detected by SEM and EDAX suggested that La did penetrate into the powders and this penetration process progressed the partly sintering of the powders which is in favor of the conductivity.
李佳龙郝素娥付东升王威马天龙王春艳
Fabrication and properties of La modified AZO powders via a gaseous penetration processing
2010年
A new kind of AZO powders were synthesized by co-precipitation method with the doping content of Al was 3.0 wt%. Further modification of La to the powders was done via a gaseous penetration processing. Changes in constitution,structure,and electrical conductivity caused by doping and penetration were characterized. The doping of Al lowered the resistivity of AZO powders from over 1×1014(ZnO made domestically) to 4.24×107 Ω·cm. But more effective modification via gaseous penetration processing decreased the resistivity of La penetrated AZO powders to the lowest point of 2.45×105 Ω·cm. The optimal penetration conditions coordinated by orthogonal test were that La3+ content of the penetration solvent was 2.0 wt.%,and that the penetration processing lasted for 5 h at the temperature of 480 oC. XRD analysis demonstrated that the doping process of Al only leaded to the changes of the peak width and intensity without new phases appearing. Yet,new phases appeared after the processing of gaseous penetration of La,which indicated that La enter the AZO powders thus complex reactions occurred to form the extra compounds. EDAX analysis,coupling with XRD,provided the evidence that La did exist in the penetrated AZO powders and the potential sign of the generation of extra compounds. Through SEM images,it was illustrated that the gaseous penetration processing progressed the growth of grain size in the shape of rod and generated distinguishable phases of extra compounds.
郝素娥付秋月李佳龙米南
关键词:AZO
Pr,Mn改性BaTiO_3陶瓷的制备及其PTC特性被引量:2
2008年
采用溶胶凝胶法制备了Pr,Mn掺杂的BaTiO3陶瓷,并对其进行了Pr,Mn气相扩渗。研究结果表明,Mn掺杂能提高BaTiO3陶瓷的室温电阻率至1015Ω·m,但再经Pr扩渗后降至107Ω·m,经Pr-Mn共渗后降至2.01Ω·m。Pr掺杂能降低BaTiO3陶瓷的室温电阻率至105Ω·m,再经Mn扩渗后,室温电阻率变化不大,但经Pr-Mn共渗后室温电阻率显著降低,达到2.04Ω·m。Pr气相扩渗能显著降低电阻率,而Mn的加入有利于改善PTC特性。经Pr扩渗的Mn掺杂BaTiO3陶瓷在350℃后有明显的NTC效应,升阻比高达106;经Mn扩渗的Pr掺杂BaTiO3陶瓷在370℃附近出现突降点,电阻率降至0.1Ω·m,升阻比约为105。XRD分析表明,Pr,Mn掺杂或扩渗都没有改变BaTiO3陶瓷的物相结构。XPS分析表明,在气相扩渗过程中,C和Pr元素都进入了陶瓷体,并主要分布于晶界或者陶瓷的气孔中,导致了改性BaTiO3陶瓷电阻率的明显下降和NTC效应的产生。气相扩渗对掺杂后的陶瓷有减小结合能的活化作用,而对纯BaTiO3陶瓷有增强稳定性的作用。
郝素娥黄金祥张巨生
关键词:钛酸钡稀土PTC效应
La,Pr改性ZnO导电粉的制备
2009年
为了提高ZnO的导电性,采用稀土气相扩渗法对ZnO粉体进行了La,Pr改性.采用X射线衍射分析、扫描电子显微镜、差热分析和电阻测试仪,对改性前后ZnO组成、结构及电性能的变化进行了研究.XRD测试结果表明:La扩渗后,在29.5°出现了一个与La有关的特征峰,Pr扩渗后,在30.5°出现了一个与Pr有关的特征峰,证明La,Pr已渗入ZnO粉体.SEM测试结果表明:ZnO粉体经La,Pr扩渗后晶粒明显细化,团聚现象减弱.热重分析表明:经稀土扩渗后的ZnO粉体具有较好的热稳定性.La,Pr扩渗后ZnO粉体的室温电阻率由1014Ω.cm分别下降到1.6×106Ω.cm和1.9×106Ω.cm,说明La,Pr扩渗可明显改善ZnO粉体的导电性能和应用性能.
郝素娥左海英
关键词:ZNO导电粉
煅烧温度对Ca_(1-x)Pr_xMnO_3粉体结构与导电性能的影响
2012年
为改善CaMnO3粉体的导电性能,采用溶胶-凝胶自蔓延法在不同温度下合成Ca1-xPrxMnO3(0≤x≤0.3)粉体,并研究煅烧温度对Ca1-xPrxMnO3粉体结构及导电性能的影响.结果表明,随着煅烧温度的升高,电阻率呈现先降低后升高的变化趋势,且在1 000℃时电阻率最低.XRD分析结果表明,Ca1-xPrxMnO3粉体的特征衍射峰均向小角度方向偏移,且强度随着煅烧温度的升高而增强.XRD计算结果表明,Ca1-xPrxMnO3粉体的晶胞参数受烧结温度影响,是导致电阻率变化的原因之一,煅烧温度为1 000℃时,粉体的晶格畸变程度相对较大.SEM分析结果表明,Ca0.75Pr0.25MnO3粉体的晶粒尺寸随温度的升高不断增大,合适的粒度有利于粉体电阻率的降低.在煅烧温度为1 000℃的Ca1-xPrxMnO3粉体中Mn的平均价态最低.晶界效应、粒度和Mn的价态3个因素共同作用导致了Ca1-xPrxMnO3粉体的电阻率随温度升高而呈现先减小后增大的变化趋势。
付秋月郝素娥孟宪伟李佳龙李云娇
关键词:稀土煅烧温度导电性能
稀土改性BaTiO_3粉体的制备及其导电性分析被引量:3
2009年
采用溶胶-凝胶法制备了纯BaTiO3粉体,并以La、Pr、Nd、Sm、Gd和Er等稀土元素通过液相掺杂、气相掺杂和液-气共掺3种不同的方式对其进行改性,以提高BaTiO3粉体的导电性。实验结果表明:各种稀土均可降低BaTiO3粉体的电阻率,效果最好的是Sm。不同掺杂方式中液-气共掺的效果最好,通过液相掺杂、气相掺杂和液-气共掺,BaTiO3粉体的电阻率由4.30×109Ω·m分别降至2.38×105,4.34×104和35.4Ω·m。XRD、SEM、FTIR分析表明,液相掺杂时进入BaTiO3粉体的稀土元素主要集中在晶界处,而气相掺杂后稀土元素主要进入晶格内部,可能取代了Ti4+在晶格中的位置。半径较小的稀土元素更容易迁移而偏离钛氧八面体的中心位置,由此导致稀土掺杂后BaTiO3粉体的电阻率显著降低。
郝素娥王威力王春艳付东升李佳龙
关键词:钛酸钡稀土导电粉
稀土气相掺杂BaTiO_3基PTC陶瓷的制备与电性能被引量:4
2007年
采用稀土气相掺杂的方法制备了La,Pr,Gd改性的BaTiO3基PTC陶瓷,通过室温电阻率和温-阻效应的测试及SEM分析,对其PTC特性进行了研究.结果表明:BaTiO3基PTC陶瓷经稀土气相掺杂后,室温电阻率明显下降,在不同粉料配方基础上制备的4组BaTiO3基PTC陶瓷,经La,Pr,Gd气相掺杂后,其室温电阻率分别下降为2.5×105、70.0、220.0、40.0、3.5×104、50.0、9.6、5.0Ω.m以及1.3×104、98.5、2.3×104、32.4Ω.m.而稀土液相掺杂的BaTiO3基PTC陶瓷的室温电阻率均在104Ω.m以上.稀土气相掺杂BaTiO3基PTC陶瓷的温-阻效应与稀土液相掺杂结果截然不同,产生了明显的NTCR效应.
郝素娥黄金祥孙亮
关键词:稀土钛酸钡电性能
Preparation of PbTiO_3 Conductive Powders and Coatings
2007年
La2O3 and Ce2O3 were penetrated into PbTiO3 to obtain conductive powders, and then they were mixed with polyurethane and butyl acetate to prepare conductive coatings. The results showed that the electric property of modified PbTiO3 powders was improved by penetration of La2O3 and Ce2O3. XRD patterns showed that some new compounds such as La2Ti6O15, CeTi21O38 and Pb0.634La0.209Ti0.948O2.284 were formed, which led to the rapid increase of conductivity. The resistivity of modified PbTiO3 powders decreased to 3.88 Ω·m. The coatings using modified PbTiO3 powders as fillings also had a good conductivity. When the PbTiO3 powders were 10% and antisettle agent (bentonite) content was 0.50%, and mass ratio between polyurethane and butyl acetate was 1.05, the surface resistivity of the coatings fell down to 1.3×108 Ω·m. This kind of conductive coatings could be used in electromagnetic shielding.
王威力郝素娥王春艳
Ca_(1-x)Sm_xMnO_3粉体的制备及其结构与导电性
2011年
为了实现改性CaMnO3粉体在导电材料领域的应用,采用自蔓延溶胶-凝胶法合成了Ca1-xSmxMnO3(0≤x≤0.3)粉体,并研究了不同Sm掺杂量对Ca1-xSmxMnO3粉体结构和导电性的影响.结果表明,Sm掺杂能够有效降低CaMnO3粉体的室温电阻率,且随着Sm掺杂量的增大呈现典型的V型变化趋势,在x=0.2时电阻率最低,为0.2920Ω.m,且Ca0.8Sm0.2MnO3粉体具有较好的频率稳定性和高温导电性能.XRD和SEM结果表明,随x值增大Ca1-xSmxMnO3衍射峰的强度有所减小,并向小角度方向偏移;晶胞参数和晶胞体积逐渐增大;晶粒尺寸呈现先减小后增大的变化趋势.Sm掺杂能够引起Ca1-xSmxMnO3的晶格畸变,并由此导致了Ca1-xSmxMnO3粉体电阻率先降后升的变化规律.
孟宪伟郝素娥李佳龙
关键词:导电粉稀土
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