添加剂对锆钛酸铅二元系压电陶瓷性能的影响

对添加剂按电价进行了分类，讨论了各类添加剂对锆钛酸铅二元系压电陶瓷性能的影响，分析了各类添加剂对锆钛酸铅二元系压电陶瓷性能的原因。研究表明，各种添加剂的加入量都有一个适宜的范围。     

锰锑酸铅-锌铌酸铅-锆钛酸铅陶瓷的铁电性能

通过电滞回线测试,探讨了xPb(Mn1/3Sb2/3)0.05(Zr1/2Ti1/2)0.95O3(1-x)Pb(Zn1/3Nb2/3)0.28(Zr1/2Ti1/2)0.72O3[xPMnS-(1-x)PZN]陶瓷的铁电性能及铁电相变特性.同时研究了Ba2 取代Pb2 对材料铁电性能的影响.结果表明;三方相含量较高的0.2PMnS-0.8PZN陶瓷具有较高的矫顽场和较大的剩余极化强度;四方相含量较高的0.5PMnS-0.5PZN和0.6PMnS-0.4PZN陶瓷具有较低的矫顽场和较小的剩余极化强度,Ba2 取代使三方相含量增加,铁电性能明显提高.     

氧化锰对铌锑锆钛酸铅(PNSZT)压电陶瓷性能的影响

本文研究了氧化猛对铌锑锆钛酸铅压电陶瓷性能的影响,探讨了氧化锰的作用机理,为用氧化锰改性锆钛酸铅压电陶瓷提供了理论依据。     

丁腈橡胶/铌镁锆钛酸铅/碳纤维复合材料的介电性能和压电性能

以丁腈橡胶(NBR)为基体,铌镁锆钛酸铅(PMN)粉体为分散相,碳纤维(CF)为导电填料,制备了压电复合材料,研究了复合材料的压电性能及介电性能。结果表明,80%以上PMN粒子的粒径为0.5~2.0μm,填充密度约为6.6g/cm3;当填充CF体积分数小于5%时,复合材料的击穿电压受填充CF用量的变化影响不大,当填充CF体积分数达到10%时,复合材料的击穿电压下降到未填充CF复合材料的1/3~1/2,填充CF最佳体积分数为5%;当填充PMN体积分数增至40%后,复合材料的纵向压电应变常数(d33)随PMN用量的增加而增大;适当地延长极化时间和增加极化电压有利于提高d33,最佳极化电压为7kV/mm,最佳极化时间为25min;复合材料的介电常数(ε)随填充PMN用量的增加而增大;当CF用量为0时,复合材料的ε与介电损耗(tanδ)的变化趋势相反;当填充CF体积分数为5%时,复合材料不但具有较高的ε,而且具有较高的tanδ。     

钛酸铜锶钡陶瓷晶相结构及介电性能研究

采用溶胶-凝胶法制备(Ba0.5Sr0.5)1-xCuxTiO3高介电性能陶瓷,用X射线衍射和LCR分析仪对不同x取值和烧结温度制备陶瓷的晶相组分和介电性能进行分析对比,结果表明,x=0.1可以得到比较好的固溶体;随着Cu2比例上升,陶瓷中出现氧化铜杂相;并且,烧结温度升高,陶瓷中氧化铜相含量也增加.氧化铜相含量的增加使陶瓷的介电系数获得明显提升,可达104数量级,但与此同时,氧化铜相也使陶瓷的介电损耗有所增大.     

Pb 1-xSrx(Mn1/3Sb2/3)aZrbTicO3三元系压电陶瓷的压电和介电性能

对Pb 1-xSrx(Mn1/3Sb2/3)aZrbTicO3+0.2%(质量分数)CeO2 (PMS-PZ-PT)三元系压电陶瓷的烧结温度(1 150～1 225 ℃)和Sr2+取代量(摩尔分数0～8%)进行了系统研究. 通过XRD图谱计算的晶格参数说明Sr2+取代Pb2+后, 晶胞更趋于各向同性且产生收缩, 从而改善样品的性能. 实验结果表明 当x=0.02时, 在1 200 ℃, 2 h条件下烧结, 能获得优良的综合性能εr =1 461, tanδ=0.003 8, Kp=0.63, Qm=1 321, d33=409×10-12 C·N-1, 可以满足超声马达和压电变压器等应用方面的要求.     

不同氧化锰引入形式对铌锑锆钛酸铅压电陶瓷性能的影响

研究了不同氧化锰引入形式对Ｐｂ（Ｓｈ１／５Ｎｂ１／２）Ｏ３－Ｐｂ（Ｚｒ,Ｔｉ）Ｏ３（ｐｓｎｚｔ）压电陶瓷机电性能的影响。结果有明,以ＭｎＯ２引入氧化锰的受主作用比ＭｎＣＯ３引入的要大。     

锆钛酸铅PZT压电陶瓷的制备及其性能研究

以具有优良压电性能的二元系固溶体锆钛酸铅(PZT)材料为研究对象,以其制备工艺、结构和性能作为主要研究内容,通过高温固相烧结方法对PZT的合成规律进行了研究,使用XRD谱、Raman谱结构表征手段和XPS、热膨胀、介电测量等物性测试技术研究了它们的晶体结构、晶粒尺寸与性能的关系,以及合成条件对铁电材料的微观结构和性能的影响。     

添加剂对锆钛酸铅二元系压电陶瓷性能的影响

对添加剂按电价进行了分类，讨论了各类添加剂对锆钛酸铅二元系压电陶瓷性能的影响，分析了各类添加剂能对锆钛酸铅二元系压电陶瓷进行改性的原因。研究表明各种添加剂的加入量都有一个适宜的范围。     

锆钛酸铅陶瓷的烧结研究进展

综述了国内外锆钛酸铅(PZT)压电陶瓷的烧结研究进展，介绍了各国研究者为获得烧结致密、性能优良的PZT陶瓷所采取的各种措施，并展望了其发展方向。     

Structural and Physical Properties of Nd-Doped Pb(Zr0.52Ti0.48)O3 Ceramics

Lead zirconate titanate (PZT) ceramics (Zr/Ti = 52/48) have been modified with different quantities of neodymium oxide (Nd₂O₃). The preparation was carried out via the solid-state-reaction route. The samples were calcined and sintered at 850°C and 1200°C, respectively. The structural evolution and the microstructure were investigated using an X-ray diffractometer (XRD) and a scanning electron microscope (SEM), respectively. The physical properties such as dielectric constants, piezoelectric coefficients, density etc. were also studied.     

Electrocaloric Effect in Ba(Zr,Ti)O3–(Ba,Ca)TiO3 Ceramics Measured Directly

In this paper, we report on studies of the electrocaloric (EC) effect in lead‐free (1?x)Ba(Zr_0.2Ti_0.8)O₃–x(Ba_0.7Ca_0.3)TiO₃ ceramics with compositions range between 0.32 ≤ x ≤ 0.45. The EC effect was measured directly using a modified differential scanning calorimeter. The maximum EC temperature change, ΔT_direct = 0.33 K under an electric field of 2 kV/mm, was observed for the composition with x = 0.32 at ~63°C. We found that the EC effect peaks not only around the Curie temperature but also at the transition between the ferroelectric phases with different symmetries. A strong discrepancy observed between the results of the direct measurements and indirect estimations points out that using Maxwell's equations is invalid for the thermodynamic nonequilibrium conditions that accompany only partial (incomplete) poling of ceramics. We also observe a nonlinearity of the EC effect above the Curie temperature and in the temperature range corresponding to the tetragonal ferroelectric phase.     

Microstructure and electric properties of Pr-doped Pb(Zr0.52Ti0.48)O3 ceramics

Improving the piezoelectric activity of lead zirconate titanate (PZT) ceramics is of great importance for practical applications. In this study, the influence of Pr³⁺ doping on the ferroelectric phase composition, microstructure, and electric properties on the A-site of (Pb_1-1.5xPr_x)(Zr_0.52Ti_0.48)O₃ is extensively investigated. A dense and fine microstructural sample is obtained with the introduction of Pr³⁺. The results show that the morphotropic phase boundary (MPB) moves to the rhombohedral phase region. The rhombohedral and tetragonal phases exhibit an ideal coexistence in the 4 mol.% Pr³⁺ doped (PPZT4) samples. Lead vacancy and the reduction of the potential energy barrier are considered to be the key mechanisms for donor doping, which is upheld by the Pr³⁺ doping. Combining the I-E hysteresis loops with the P-E hysteresis loops, it becomes apparent that both contribution maximums of the domain switching and residual polarisation are in PPZT4. Moreover, the thermal aging resistance of PZT is improved by doping, and the temperature stability is optimised from 83% in PZT to 96% in PPZT4. Hence, an appropriate amount of Pr³⁺ doping can effectively improve the piezoelectric activity of PZT ceramics in the MPB area and optimise the performance stability of the material under application temperatures.     

CaTiSiO5掺杂对钛酸钡锶陶瓷介电性能的影响

采用传统固相烧结法,利用X-射线衍射仪(XRD)、扫描电镜(SEM)等方法系统研究了CaTiSiO5掺杂量对(Ba,Sr) TiO3(barium strontium titanate,BST)基电容器陶瓷介电性能和微观结构的影响.结果表明:CaTiSiO5掺杂的BST陶瓷材料的介电损耗都比较小,但是对材料居里峰的移动和展宽效应都明显.随着CaTiSiO5掺杂量的增加,BST陶瓷的介电常数(εr)先增大然后减小,介电损耗(tanδ)先增大然后减小,变化不大,交流耐压强度(Eb)先增大然后减小,容温变化率先减小然后增大.当掺杂CaTiSiO5质量分数为0.8％时,BST陶瓷的综合介电性能较好:介电常数(εr)=2540,介电损耗(tanδ)=0.0036,耐压强度(Eb)=5.6 kV/mm(AC),在-30～85℃温度范围内,容温变化率为-18.9％ ～ 20.6％,容温特性符合Y5S特性.     

Ba(Zr0.3Ti0.7)O3薄膜的结构及性能

用溶胶-凝胶法分别在Pt/Ti/SiO2/Si和LaNiO3/Pt/Ti/SiO2/Si衬底上制备了锆钛酸钡[Ba(Zr0.3Ti0.7)O3,BZT]薄膜.相结构及介电性能研究表明:衬底和薄膜厚度对BZT薄膜性能具有显著影响.制备在LaNiO3/Pt/Ti/SiO2/Si衬底上的BZT薄膜具有(100)面的择优取向,其介电常数及介电损耗则随着薄膜厚度的增加而降低.对制备在Pt/Ti/SiO2/Si衬底上的BZT薄膜,在薄膜厚度低于500nm时,其介电常数随薄膜厚度增加而增加,大于500nm时又有所减小.     

(Ba0.85Ca0.15)(Ti0.90Zr0.06Sn0.04)O3-Fe2O3无铅压电陶瓷的性能研究

采用固相法制备了(Ba0.85Ca0.15) (Ti0.90Zr0.06Sn0.04)O3-xmol％Fe2O3(简写为BCTZS-xFe)无铅压电陶瓷.研究了不同掺杂量对该陶瓷的显微结构、介电、铁电及压电性能的影响.结果表明,所有样品均具有单一的钙钛矿结构,少量掺杂能使晶粒长大,提高电性能.在x=0.025时,具有最佳的综合电性能,压电常数d33 =515 pC/N,机电耦合系数kp=48.2％,机械品质因数Qm =182,2Pr=18.2 μC/cm2,2Ec =4.3 kV/cm,介电常数εr=5175.     

Effect of SrRuO3 layer thickness on electrical properties of Pb(Zr0.52Ti0.48)O3/SrRuO3 superlattices

Artificial ferroelectric superlattices have received considerable attention because of the potential to realize macro-performance adjustments and bring exotic phenomena. In recent years, it has been reported that metallic SrRuO₃ with single-unit-cell thickness can be used as the constituent material of ferroelectric superlattices, but the effect of SrRuO₃ thickness on ferroelectric properties is not clear. In this study, Pb(Zr_0.52Ti_0.48)O₃/SrRuO₃ (PZT/SRO) ferroelectric/metallic superlattices with the thickness of SRO layers ranging from 1 to 3 unit cells have been grown on Nb:SrTiO₃ substrates by pulsed laser deposition (PLD), and their structural and electrical properties are investigated. The experimental results show that the electrical properties of the PZT/SRO superlattices are greatly affected by the thickness of SRO layers, and the PZT₁₀/SRO₂ superlattice possesses the best electrical properties. The X-ray photoelectron spectroscopy (XPS) results show that oxygen vacancies are accumulated at the PZT/SRO interfaces, which can reduce the depolarization fields and the leakage current. The results demonstrate that the thickness of metallic conductive oxide in the ferroelectric/metallic superlattices is a key factor affecting their ferroelectric properties.     

(1-x)Ba4Sm9.33Ti18O54-xCa0.61Nd0.26TiO3系微波介质陶瓷

采用固相合成法制备了(1-x)Ba4Sm9.33Ti18O54-xCa0.61Nd0.26TiO3[(1-x)BST-xCNT]系微波介质陶瓷.探讨了组成、烧结温度对微波介质陶瓷结构、介电性能的影响.x＜0.6时,(1-x)BST-xCNT陶瓷为正交结构的新型钨青铜单相.x≥0.6时,相继出现了第二相Sm2Ti2O7和钙钛矿相,最终形成钙钛矿单相.微波介质陶瓷的介电常数ε随x的增大持续升高,品质因子Qf值则先增大后迅速减小再急剧增大.1 325～1 350 ℃烧结样品的微波介电性能达到最佳:x=0时,ε=75,Qf=8985GHz,谐振频率温度系数τf=-8.2×10-6/℃;x=0.2时,ε=75,Qf=9 552GHz,τf=-14.4×10-6/℃;x=1时,ε=108.9,Qf=14919GHz,τf=236.2×10-6/℃.     

Combustion synthesis and electromagnetic properties of nanocrystalline Pb(Zr0.52Ti0.48)O3

The properties of nanocrystalline lead zirconate titanate [PZT, Pb(Zr_0.52Ti_0.48)O₃] thick films and pellets synthesized by self-propagating auto combustion route using sucrose as a fuel are reported. The X-ray diffraction reveals the formation of nanocrystalline tetragonal PZT having a particle size of 5.52 nm in thick films and 7.08 nm in bulk material. SEM images show the grain size of 300–400 nm with some agglomeration, as well as modified open grain boundaries and grain growth in the PZT thick film as compared to the bulk material. The DC electric resistivity of PZT shows semiconducting behavior. We also characterized the 8–18 GHz microwave insertion loss, absorption, complex permittivity, and microwave conductivity of synthesized materials. The real part of permittivity and dielectric loss were found to decrease with increasing frequency.     

0.06BiYbO3-0.94Pb(Zr0.48Ti0.52)O3三元系压电陶瓷的氧化物掺杂改性研究

针对新一代声波测井仪器对其核心元件压电陶瓷兼具高居里温度、高压电系数以及高稳定性要求的迫切需求,本文采用传统的固相反应-无压烧结技术制备了一种0.06BiYbO₃-0.94Pb(Zr_0.48Ti_0.52)O₃(BY-PZT)三元系压电陶瓷,并研究了四种氧化物掺杂对其微观结构及电学性能的影响。由XRD和SEM表征可知所有样品均呈纯四方相钙钛矿结构,掺杂Cr₂O₃的样品平均晶粒尺寸最大。介电温谱和谐振频谱研究证实四种氧化物掺杂均能提高其介电性能的温度稳定性。掺杂La₂O₃的样品介电常数温度系数(Tk_ε)最低,掺杂MnO₂的样品机械品质因素(Q_m)最高,而掺杂CeO₂的样品抗热退极化性能最好。高温复阻抗(Cole-Cole图)分析表明,Cr₂O₃掺杂能够显著提高BY-PZT陶瓷的高温电阻率,陶瓷在高温下的电导行为主要由晶界响应控制。综合来看,掺杂La₂O₃的样品兼具高居里温度(T_C=397 ℃)和高压电系数(d₃₃=290 pC/N),并且在300 ℃退火4 h后d₃₃仍能保持在270 pC/N左右,有望在极限工作温度为300 ℃的高温压电器件中获得应用。