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居里峰
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  curie peak
     The formation of some unexpected transition phase do harm to dielectric properties of system in sintering process, which can be avoided by doping with precursor in fine-grained BaTiO3. After substitution precursor for Ti4+, the Curie peak of Ba(Ni1/3Nb2/3)O3 and Ba(Mn 1/3Nb2/3)O3 were shifted to negative temperature.
     由于(Ni1/3Nb2/3)O3与(Mn1/3Nb2/3)O3的居里点在负温,因此系统中先驱体取代后形成的Ba(Ni1/3Nb2/3)O3与Ba(Mn 1/3Nb2/3)O3的居里峰将向负温方向移动。
短句来源
     Sm2O3 depressed Curie peak intensively and shift it to low temperature.
     Sm2O3抑制居里峰的作用较强,可以将居里峰值大幅度移向低温。
短句来源
     The effects of Nb_2O_5/Co_2O_3 additive amount on the properties of BST ceramics are conducted by means of fining grain,repressing and broadening Curie peak,improving temperature character of dielectric constant,decreasing dielectric constant,forming impurity phase and coming into being"Core-shell" structure.
     Nb2O5/Co2O3加入量对BST陶瓷性能的影响是通过细晶化、压抑展宽居里峰、改善介电常数温度特性、减少介电常数、形成杂相、形成“晶核-晶壳”结构等进行。
短句来源
     The experimental results show that the ceramic compositions of BLTZ system have diffuse phase transition characteristics and rather large electrostrictive effect in the vicinity of Curie peak.
     实验结果表明,BLTZ系列材料是属于扩散相变的材料,在居里峰附近有较大的电致伸缩效应。
短句来源
     The X-ray diffraction data shows that the c/a ratio decreases continuously to near unity with increasing amounts of calcium ion on the B site up to 5%. From the temperature dependence of the dielectric constant it can be seen that the Curie peak is broadened and moves to room temperature for the composition with 5% of Ca ion on B sites and 6% on A sites.
     X射线衍射数据表明,随着B位Ca离子含量的增加(直至5%)c/a比下降至接近1.从介电系数的温度关系可见:含5%B位与6%A位Ca离子的组份其居里峰展宽且下降至室温.
短句来源
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  courier peak
     Courier Peak of Frequency Domain Dielectric Spectroscopy
     频域介电谱中的居里峰
短句来源
     Dielectric spectroscopy of Ba 0.68Sr 0.32TiO 3 ceramics undergoing ferroelectric phase transition has been measured in frequencies from 0.03 Hz to 10 kHz. If frequency changes to be low enough,the courier peak moves towards low temperature,while its amplitude goes to be m ore and more undistinguishable.
     在 0 0 3~ 10 0 0 0Hz范围对Ba0 6 8Sr0 3 2 TiO3 陶瓷的铁电相变作了介电谱测量 ,当频率足够低时居里峰位置向低温端移动 ,并且峰值变得越来越不明显。
短句来源
  peak value at curie temperature
     By doping with MgO,the peak value at Curie temperature could be outspread,the abnormal growth of the grain size could be prevented and the range of sintering temperature could be widen.
     添加适量的MgO不但展宽了居里峰 ,而且防止晶粒过渡生长 ,并拓宽了陶瓷的烧结温度区 ;
短句来源
  “居里峰”译为未确定词的双语例句
     Ca/Sn co-substitution shifts the T_m of (Ba_(1-x)Ca_x)(Ti_(1-y)Sn_y)O_3 ceramics towards the room temperature.
     Ca元素与Sn元素的协同置换产生的非线性规律,使得(Ba_(1-x)Ca_x)(Ti_(1-y)Sn_y)O_3各个成分的居里峰更移向室温附近。
短句来源
     From those measurements, the dielectric constants areimproved with the increase of additive amount of BNT, If the amount continueincrease,theproperties becomeworse,theoptimum dielectricconstant ofthesamplescanreach 4300.WhendopedMnCO3,Y2O3,MgCO3andCeO2inthe (Bi_(0.5)Na_(0.5))TiO3-SrTiO3ceramics , we can see: the MnCO3doping can move and press the peak at the Curietemperature;
     室温下SrTiO_3系陶瓷的介电常数随着BNT加入量的增加而逐渐提高,达到一定峰值后又逐渐下降,其最高可以达到4300。 在(Bi_(0.5)Na_(0.5))TiO_3-SrTiO_3基础上掺杂MnCO_3,Y_2O_3,MgCO_3和CeO2时发现,MnCO_3掺杂具有居里峰展宽效应及压峰效应;
短句来源
     In barium titanate based ceramic, doping small rare earth oxide Dy_2O_3 can keep back the growth of crystal grain, producing close grain effect, making curie summit in entire work temperature range scatter and spread, get higher dielectric constant andgood capacity temperature property,satisfy X7R property, raising the compression strength of barium titanate based ceramic substantially.
     在钛酸钡基陶瓷中微量掺杂稀土氧化物Dy_2O_3可以抑制晶粒生长,产生细晶效应,使得居里峰在整个工作温区内弥散展宽,获得较高的介电常数和良好的容量温度特性,满足X7R特性,可以大幅度提高钛酸钡基陶瓷的耐压强度。
短句来源
     3.In high dielectric constant X7R MLC ceramic system, Grain inhibitor Nb2O5, Broadening Cure peak addition MgO and various Rare-earth oxides were added to the major material of submicron BaTiO3. The optimal microstructure with dense fine grains, high dielectric constant and other excellent dielectric properties has been obtained.
     3.在高介X7R MLC瓷料系统中,选用亚微米级的共沉淀BaTiO3为基,添加晶粒抑制剂Nb2O5、居里峰展宽剂MgO以及多种稀土氧化物,获得了细晶致密的微观结构和高介电常数及其他优良的介电性能。
短句来源
     In ultra-low frequancies, because of the contribution of the space charge,dielectric constant of the sample in the higher temperature is much higher than the Curie-peak of 58 ℃ .
     在超低频下,由于空间电荷激发的贡献,样品的介电常数在较高温度下远超过58℃时的居里峰.
短句来源
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  curie peak
Dy has no influence on shifting and depressing Curie peak.
      
However, Mg has evident effect on shifting Curie peak.
      
With increasing the amount of calcium addition, the Curie peak was depressed and completely broadened for the compositions with calcium addition more than 3 mol %, where the average grain size was smaller than 1 μm.
      
Co-firing with nickel electrodes in a reducing atmosphere also depressed the Curie peak and inhibited the grain growth due to the diffusion of nickel into the dielectrics.
      
Dielectric constant vs temperature plots of lead rich glass ceramics samples show a peak similar to Curie peak in case of ceramic lead strontium titanate.
      


The dielectric behavior and electrostrictive effect of a non-lead ceramic system(Ba_(1-z) La_z)(Ti_(1-y)Zr_y)_(1-z/4)O_3(BLTZ) at room temperature have been studied. The dielectric constants varied with temperature and electrostrictive coefficients Q_11, Q_12 have been measured.The experimental results show that the ceramic compositions of BLTZ system have diffuse phase transition characteristics and rather large electrostrictive effect in the vicinity of Curie peak. For samples,with the same y value, the Curie...

The dielectric behavior and electrostrictive effect of a non-lead ceramic system(Ba_(1-z) La_z)(Ti_(1-y)Zr_y)_(1-z/4)O_3(BLTZ) at room temperature have been studied. The dielectric constants varied with temperature and electrostrictive coefficients Q_11, Q_12 have been measured.The experimental results show that the ceramic compositions of BLTZ system have diffuse phase transition characteristics and rather large electrostrictive effect in the vicinity of Curie peak. For samples,with the same y value, the Curie peak shifts with increase of z value toward the direction of lower temperature and the electrostricrive effect also reduces correspondingly. Compared with electrostrictive materials avilable, effect of the optimum proportion of this system is equivalent to that of the PMN-PT-BZN materialoOwing to lack of poisonous element(lead)in the BLTZ, this king of ceramics would become a promising material for application.

研究了无铅陶瓷(Ba_(1-z)La_z)(Ti_(1-y)Zr_y)_(1-z/4)O_3(简称BLTZ)系列的介电行为及在室温下的电致伸缩效应。测量了各种成分样品的介电常数随温度变化曲线以及纵向、横向电致伸缩系数Q_(11)、Q_(12)。实验结果表明,BLTZ系列材料是属于扩散相变的材料,在居里峰附近有较大的电致伸缩效应。对于同一y值的材料,居里峰随z值的增加而移向低温方向,而且室温下的电致伸缩效应也相应减小。与现有电致伸缩材料相比,本系列中最佳配方材料的效应已经与PMN-PT-BZN材料的相当,而且由于本材料中不含铅、无毒,因而在应用上是大有希望的。

The effect of B-site calcium ion on the ferroelectric transition of barium titanate ceramics is investigated by x-ray diffraction, transmission electron microscopy, and scanning electron microscopy, and by the measurements of dielectric properties and equilibrium electric conductivity. The X-ray diffraction data shows that the c/a ratio decreases continuously to near unity with increasing amounts of calcium ion on the B site up to 5%. From the temperature dependence of the dielectric constant it can be seen...

The effect of B-site calcium ion on the ferroelectric transition of barium titanate ceramics is investigated by x-ray diffraction, transmission electron microscopy, and scanning electron microscopy, and by the measurements of dielectric properties and equilibrium electric conductivity. The X-ray diffraction data shows that the c/a ratio decreases continuously to near unity with increasing amounts of calcium ion on the B site up to 5%. From the temperature dependence of the dielectric constant it can be seen that the Curie peak is broadened and moves to room temperature for the composition with 5% of Ca ion on B sites and 6% on A sites. It is found that the lowering of the Curie point for a given change in the Ca composltion(0-5%)on B sites is more pronounced when there is Ca(about 50%)on A sites. Based on these results, a thermodynamic model has been developed to explain the mechanism of the Curie peak shifting and the broadening effect caused by the B site Ca ions in Ca-doped barium titanate.

用X和射线衍射、透射电镜、扫描电镜、介电性能与电导平衡等方法研究了B位Ca离子对BaTiO_3;陶瓷铁电相变的影响.X射线衍射数据表明,随着B位Ca离子含量的增加(直至5%)c/a比下降至接近1.从介电系数的温度关系可见:含5%B位与6%A位Ca离子的组份其居里峰展宽且下降至室温.发现了当含A位Ca离子(约5%)时,B位Ca离子含量的变化对降低居里点有较显著的作用.据此结果,本文发展了一套热力学模型以解释Ca掺杂BaTiO_3中B位Ca离子对居里峰移动与展宽的作用.

This paper puts forword three measurement methods:The first one is to mea-sure R—T and I—V characteristics of PTC material and devices with an intelligentdigital multimeter and microcomputer system.The second one is to record the tran-sient and steady state currents of defices with a transient waveform store,and thelast one is to study the relation between dielectric constant,dielectric loss factor tgoand temperature with a vectorial resolver.Thus the range of material grain size andits relaxor performance can...

This paper puts forword three measurement methods:The first one is to mea-sure R—T and I—V characteristics of PTC material and devices with an intelligentdigital multimeter and microcomputer system.The second one is to record the tran-sient and steady state currents of defices with a transient waveform store,and thelast one is to study the relation between dielectric constant,dielectric loss factor tgoand temperature with a vectorial resolver.Thus the range of material grain size andits relaxor performance can be found from the width of Curies peak.The breakdown voltage model of PTC material and experimental attentions arealso described in this paper.

本文提出三种测量方法:一是用智能数字多用表和微机系统来测量 PTC 材料或器件的 R—T 特性以及I—V 特性。二是用瞬态波形存贮器自动记录 PTC 器件的瞬态电流和稳态电流。三是用矢量分解器研究该类材料的介电常数和介电损耗因子 tgδ对温度的关系,由此可以从居里峰的宽度探知材料的晶粒尺寸范围以及这类材料的弛豫性能。本文还简述了 PTC 材料的电击穿模型及试验应注意的事项。

 
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