Cold sintering of the ceramic potassium sodium niobate, (K0.5Na0.5)NbO3, and influences on piezoelectric properties
Cold sintering of the ceramic potassium sodium niobate, (K0.5Na0.5)NbO3, and influences on piezoelectric properties
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陶瓷铌酸钾钠 (K0.5Na0.5)NbO3 的冷烧结及其对压电性能的影响
DOI：
10.1016/j.jeurceramsoc.2021.10.002
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发表时间：
2022
影响因子：
5.7
通讯作者：
Randall, Clive A.
中科院分区：
文献类型：
--
作者：
Tsuji, Kosuke;Fan, Zhongming;Bang, Sun Hwi;Dursun, Sinan;Trolier-McKinstry, Susan;Randall, Clive A.
采用冷烧结法致密化0.5KNbO_3-0.5NaNbO_3(KNN)的KNbO_3-NaNbO_3(KNN)固溶体；该工艺使用瞬时化学烧结助剂，中压(400 Mpa)，温度在230-300℃之间，以获得理论密度为∼92%至96%的陶瓷。通常情况下，需要在∼1000−1050°C之间的烧结温度才能使用传统方法来致密KNN。本文研究了在加热过程中的致密化，特别是在冷烧结过程的前60分钟内的收缩。所得陶瓷的低场介电和电学性能与传统烧结的KNN相当。可以施加高达80千伏/厘米的电场，但即使在广泛的温度和电场范围内极化后，陶瓷仍显示出夹杂的磁滞回线。用瑞利分析研究了磁畴动力学和高可逆介电常数。这种不可逆行为比传统烧结的KNN低一个数量级，可能与铁电畴的缺陷钉扎有关。透射电子显微镜(TEM)研究表明，大部分晶体中存在高密度的线缺陷；晶体中的位错限制了极化和磁壁运动，从而抑制了压电性能和磁滞。此外，透射电子显微镜观察表明，晶体晶界被梯形扭曲的台阶所刻面。这些观察结果表明，当使用冷烧结来制备具有铁电性等块体合作性能的陶瓷时，初始粉末优化和晶界扩散是重要的。讨论了有限高温均匀化对整体扩散过程的影响。
Cold Sintering was applied to densify a Potassium-Sodium Niobate solid solution composition, 0.5KNbO3-0.5NaNbO3(KNN); the process uses a transient chemical sintering aid, moderate pressure (400 MPa), and temperatures between 230–300 °C to obtain ceramics of ∼92 to 96 % theoretical density. Typically, sintering temperatures between ∼1000−1050 °C are required to density KNN using conventional methods. In this paper, the densification was investigated during heating, particularly the shrinkage in the first 60 min of the cold sintering process. The low-field dielectric and electrical properties of the resulting ceramics were found to be comparable to conventionally sintered KNN. Electric fields up to 80 kV/cm could be applied, however the ceramics showed pinched hysteresis loops, even after poling over a wide range of temperatures and electric fields. A Rayleigh analysis was used to investigate domain dynamics and high reversible permittivity. The irreversible behavior was an order of magnitude lower than in conventionally sintered KNN, likely associated with defect pinning of ferroelectric domains. A Transmission Electron Microscopy (TEM) study revealed a high density of line defects in most grains; dislocations in the grains limit poling and domain wall movement, thus suppressing both the piezoelectric properties and the hysteresis. Furthermore, TEM observations indicated crystalline grain boundaries that were faceted with terrace kink ledges. These observations point to the importance of the initial powder optimization and grain boundary diffusion when using cold sintering to prepare ceramics that are intended to show bulk cooperative properties such as ferroelectricity. The impact of limited high temperature homogenization of bulk diffusional processes is discussed.
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无铅铌酸钾钠陶瓷化学不均匀性的根源：固态合成过程中的竞争化学反应
影响因子：
9.4
作者：
Thong, Hao-Cheng;Payne, Alexis;Li, Jia-Wang;Cheng, Yue-Yu-Shan;Jones, Jacob L.;Wang, Ke
通讯作者：
Wang, Ke
影响因子：
5.7
作者：
K. Tsuji;A. Ndayishimiye;Sarah Lowum;Rich Floyd;Ke Wang;Maxwell T. Wetherington;J. Maria;C. Randall
通讯作者：
K. Tsuji;A. Ndayishimiye;Sarah Lowum;Rich Floyd;Ke Wang;Maxwell T. Wetherington;J. Maria;C. Randall
影响因子：
19
作者：
D. Marincel;Huairuo Zhang;Amit Kumar;S. Jesse;Sergei V. Kalinin;W. Rainforth;I. Reaney;C. Randall;S. Trolier-McKinstry
通讯作者：
D. Marincel;Huairuo Zhang;Amit Kumar;S. Jesse;Sergei V. Kalinin;W. Rainforth;I. Reaney;C. Randall;S. Trolier-McKinstry
DOI：
10.1073/pnas.0913172107
发表时间：
2010-04-20
影响因子：
11.1
作者：
Bintachitt, P.;Jesse, S.;Kalinin, S. V.
通讯作者：
Kalinin, S. V.