Journal of Materiomics最新文献

英文中文

High-entropy ceramics 高熵陶瓷

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-11-13 DOI: 10.1016/j.jmat.2024.100966

Yanhui Chu, Bai Cui, Frederic Monteverde

引用次数: 0

Optimization of electro-strain and ferroelectric properties of P(VDF-TrFE) films under the synergistic effect of PTO nanosheets and in-situ electrostatic field 在 PTO 纳米片和原位静电场的协同作用下优化 P（VDF-TrFE）薄膜的电应变和铁电特性

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-11-12 DOI: 10.1016/j.jmat.2024.100963

Kaiqi Zhu , Fu Lv , Jiamin Lin , Zijian Hong , Yongjun Wu , Yuhui Huang

Traditional ferroelectric materials, such as lead zirconate titanate (PZT) ceramics, exhibit positive strain when subjected to an electric field along the polarization direction. In contrast, the piezoelectric polymer polyvinylidene fluoride (PVDF) and its copolymer P(VDF-TrFE) display unique negative strain properties. While extensive research has focused on understanding the origin and mechanisms of this negative strain, limited efforts have been directed toward regulating these properties. This study optimizes the electro-strain and ferroelectric properties of P(VDF-TrFE) piezoelectric films through the synergistic effect of PbTiO₃ nanosheets and an in-situ electrostatic field. Our results demonstrate that while the incorporation of PbTiO₃ nanosheets does not notably enhance ferroelectricity, it significantly improves electro-strain properties, particularly negative strain, which increases from −0.097% to −0.185%, an enhancement of 91%. Moreover, the ferroelectric polarization and positive strain of P(VDF-TrFE) are further enhanced under the combined influence of PbTiO₃ nanosheets and in-situ electrostatic field, increasing maximum polarization from 10.79 μC/cm² to 13.16 μC/cm², a 22% improvement, and positive strain from 0.213% to 0.267%, a 25% enhancement. We propose a possible mechanism for these improvements, attributed to the enhanced flexibility of the amorphous phase and increased content of polar β-phase in P(VDF-TrFE) films under this synergistic effect. This work highlights novel strategies for controlling the electro-strain and ferroelectric properties of P(VDF-TrFE) piezoelectric films.

传统的铁电材料，如锆钛酸铅（PZT）陶瓷，在沿极化方向受到电场作用时会表现出正应变。相比之下，压电聚合物聚偏二氟乙烯（PVDF）及其共聚物 P(VDF-TrFE) 则显示出独特的负应变特性。虽然大量研究都集中在了解这种负应变的起源和机制上，但针对调节这些特性的研究却十分有限。本研究通过 PbTiO3 纳米片和原位静电场的协同作用，优化了 P(VDF-TrFE)压电薄膜的电应变和铁电特性。我们的研究结果表明，虽然 PbTiO3 纳米片的加入并没有显著增强铁电性，但却显著改善了电应变特性，尤其是负应变，从 -0.097% 增加到 -0.185%，提高了 91%。此外，在 PbTiO3 纳米片和原位静电场的共同影响下，P(VDF-TrFE) 的铁电极化和正应变进一步增强，最大极化从 10.79 μC/cm2 提高到 13.16 μC/cm2，提高了 22%，正应变从 0.213% 提高到 0.267%，提高了 25%。我们提出了这些改进的可能机制，即在这种协同效应下，P(VDF-TrFE) 薄膜中无定形相的柔韧性增强，极性 β 相的含量增加。这项工作突出了控制 P(VDF-TrFE)压电薄膜的电应变和铁电特性的新策略。

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引用次数: 0

Superb energy density in biomass-based nanocomposites with ultralow loadings of nanofillers 具有超低纳米填料负载的生物质基纳米复合材料的超强能量密度

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-11-06 DOI: 10.1016/j.jmat.2024.100960

Xiang Yu , Chenyi Li , Li Li , Minghai Yao , Hanxiao Gao , Yuquan Liu , Ze Yuan , Shengfei Tang , Quan Luo , Haibo Zhang , Yang Liu , Huamin Zhou

Biomass dielectric polymers hold promise in developing renewable and biodegradable capacitive energy storage devices. However, their typical discharged energy density remains relatively low (<20 J/cm³) compared to other existing synthetic polymers derived from petroleum sources. Here a greatly enhanced discharged energy density is reported in diluted cyanoethyl cellulose (CEC) nanocomposites with inclusion of ultralow loadings (0.3%, in volume) of 30 nm sized TiO₂ nanoparticles. Owing to the interfacial polarization introduced by interface, the composite of 0.3% exhibits a large dielectric constant of 29.2 at 1 kHz, which can be described by interphase dielectric model. Meanwhile, the introduction of nanofillers facilitate the formation of deeper traps impeding electrical conduction in CEC, which results in an ultrahigh breakdown strength of 732 MV/m. As a result, a remarkable discharged energy density of 12.7 J/cm³ with a charge-discharge efficiency above 90% is achieved, exceeding current ferroelectric-based and biomass-based nanocomposites. Our work opens a novel route for scalable biomass-based dielectrics with high energy storage properties.

生物质电介质聚合物在开发可再生和可生物降解的电容式储能设备方面大有可为。然而，与其他现有的石油来源合成聚合物相比，它们的典型放电能量密度仍然相对较低（<20 J/cm3）。据报道，在稀释的氰乙基纤维素（CEC）纳米复合材料中加入超低含量（0.3%，体积分数）的 30 纳米尺寸的 TiO2 纳米粒子后，放电能量密度大大提高。由于界面引入了界面极化，0.3% 的复合材料在 1 kHz 时显示出 29.2 的较大介电常数，这可以用相间介电模型来描述。同时，纳米填料的引入促进了 CEC 中阻碍电传导的深层陷阱的形成，从而产生了 732 MV/m 的超高击穿强度。因此，该材料的放电能量密度高达 12.7 J/cm3，充放电效率超过 90%，超过了目前的铁电基和生物质基纳米复合材料。我们的工作为具有高储能特性的可扩展生物质基电介质开辟了一条新途径。

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引用次数: 0

Emerging frontiers in metamaterials 超材料的新兴前沿

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-11-05 DOI: 10.1016/j.jmat.2024.100961

Jingbo Sun, Tao Li, Ji Zhou

引用次数: 0

Atmosphere-driven metal-support synergy in ZnO/Au catalysts for efficient piezo-catalytic hydrogen evolution ZnO/Au 催化剂中大气驱动的金属-支撑协同作用促进高效压电催化氢气进化

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-11-05 DOI: 10.1016/j.jmat.2024.100959

Di Wu , Yingxin He , Chi Lin , Bing Li , Jiangping Ma , Lujie Ruan , Yajie Feng , Chaogang Ban , Junjie Ding , Xiaoxing Wang , Danmei Yu , Li-Yong Gan , Xiaoyuan Zhou

Piezo-catalysis, which leverages mechanical energy to drive chemical reactions, is emerging as a promising method for sustainable energy production. While the enhancement of piezo-catalytic performance through metal-support interactions is well-documented, the critical influence of the synthesis atmosphere during metal-loaded piezo-catalyst preparation has been a notable gap in the field. To this end, we systematically investigate how different atmospheric conditions during the synthesis of catalysts—without gas flow or with Ar, N₂ and O₂—affect metal dispersion, oxidation states, piezo-carrier dynamics, and electronic structure, and subsequently shape the metal-support interactions and piezo-catalytic activity. ZnO/Au, with Au deposited on ZnO, is selected as the model system, and hydrogen evolution reaction is used as the probe reaction. Our results demonstrate that an oxygen-enriched atmosphere significantly enhances the metal-support interactions, achieving an ultrahigh net hydrogen yield of 16.5 mmol·g⁻¹·h⁻¹ on ZnO/Au, a 3.58-fold increase over pristine ZnO. Specifically, the performance improvements substantially surpass those synthesized under other atmospheric conditions. Conversely, exposure to CO₂ transforms the ZnO support into ZnCO₃, adversely affecting its catalytic activity. These findings reveal the crucial impact of synthesis conditions on piezo-catalyst performance and thereby open new avenues for optimizing catalyst systems for enhanced sustainability.

压电催化利用机械能驱动化学反应，正在成为一种有前途的可持续能源生产方法。虽然通过金属与支撑物的相互作用提高压电催化性能已得到充分证实，但在金属负载压电催化剂制备过程中合成气氛的关键影响一直是该领域的一个显著空白。为此，我们系统地研究了催化剂合成过程中的不同气氛条件--无气流或有 Ar、N2 和 O2--如何影响金属分散、氧化态、压电载体动力学和电子结构，并进而影响金属-支撑相互作用和压电催化活性。我们选择金沉积在 ZnO 上的 ZnO/Au 作为模型体系，并以氢进化反应作为探针反应。我们的研究结果表明，富氧气氛显著增强了金属与支撑物之间的相互作用，在 ZnO/Au 上实现了 16.5 mmol-g-1-h-1 的超高净氢产率，是原始 ZnO 的 3.58 倍。具体而言，性能的提高大大超过了在其他大气条件下合成的产品。相反，暴露在二氧化碳中会使氧化锌支持物转化为 ZnCO3，从而对其催化活性产生不利影响。这些发现揭示了合成条件对压电催化剂性能的重要影响，从而为优化催化剂系统以提高可持续性开辟了新的途径。

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引用次数: 0

Non-equimolar bismuth-layered [CaxSr(1–x)/3Ba(1–x)/3Pb(1–x)/3]Bi4Ti4O15 high-entropy ceramics with high curie temperature 具有高居里温度的非等摩尔铋层[CaxSr(1-x)/3Ba(1-x)/3Pb(1-x)/3]Bi4Ti4O15 高熵陶瓷

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-10-28 DOI: 10.1016/j.jmat.2024.100945

Mingxin Lu , Yan Fang , Xiaoyu Xu , Xiaoying Feng , Haoqi Xu , Liyang Zhou , Hui Wang , Bin Yan , Chao Chen , Hui Mei , Jie Xu , Feng Gao

Aurivillius phase ceramics exhibit significant potential in high-temperature piezoelectric devices due to their high Curie temperature. However, the rapid decrease in electrical resistivity at high temperatures limits their application. In this work, a series of non-equimolar high-entropy piezoelectric ceramics [Ca_xSr_(1–x)/3Ba_(1–x)/3Pb_(1–x)/3]Bi₄Ti₄O₁₅ were designed and prepared via a conventional solid-state method, and the influence of configurational entropy on the microstructure and electrical properties was investigated. The results show that the pure Aurivillius phase was obtained for all compositions. Due to the hysteretic diffusion effect caused by high entropy design, the grain boundary density is effectively increased, leading to a degradation of electrical transport properties. The results of Raman and TEM indicate that disordered structure and various lattice distortions such as edge dislocations, twists, and tilts of oxygen octahedra coexist in high-entropy ceramics, which synergistically contribute to the increase in ceramic electrical resistivity. Consequently, the electrical resistivity at 500 °C increased by 1–2 orders of magnitude, the sample with x = 0.4 exhibits high electrical resistivity (1.18 × 10⁸ Ω·cm), and also boasts a high piezoelectric coefficient (14 pC/N) and an optimal operating temperature (>550 °C). This work highlights a way to obtain high-performance piezoelectric ceramics with high Curie temperature through the non-equimolar high-entropy composition design.

由于具有较高的居里温度，奥里维利相陶瓷在高温压电器件方面具有巨大的潜力。然而，高温下电阻率的快速下降限制了它们的应用。本研究采用传统固态法设计并制备了一系列非等摩尔高熵压电陶瓷[CaxSr(1-x)/3Ba(1-x)/3Pb(1-x)/3]Bi4Ti4O15，并研究了构型熵对其微观结构和电性能的影响。结果表明，所有成分都获得了纯净的 Aurivillius 相。由于高熵设计引起的滞后扩散效应，晶界密度有效增加，导致电传输性能下降。拉曼和 TEM 的结果表明，无序结构和各种晶格畸变（如氧八面体的边缘位错、扭曲和倾斜）共存于高熵陶瓷中，它们协同促进了陶瓷电阻率的增加。因此，500 °C时的电阻率增加了1-2个数量级，x = 0.4的样品具有高电阻率（1.18×108 Ω-cm），同时还具有高压电系数（14 pC/N）和最佳工作温度（550 °C）。这项工作强调了一种通过非等摩尔高熵成分设计获得高居里温度高性能压电陶瓷的方法。

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引用次数: 0

Exploring the mechanisms of enhanced piezoelectric properties in (K,Na)NbO3 single crystals 探索 (K,Na)NbO3 单晶压电特性增强的机理

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-10-28 DOI: 10.1016/j.jmat.2024.100943

Da Huo , Biao Wang , Jinhui Fan , Kai Li , Yang Liu , Xudong Qi , Limei Zheng

(K,Na)NbO₃ (KNN)-based piezoelectric materials are candidates for replacing Pb-based materials. However, the piezoelectric properties of existing KNN-based single crystals are still inferior to those of Pb-based relaxor ferroelectric single crystals. Moreover, the piezoelectric response mechanism of KNN-based single crystals remains unclear. In this study, (Li,K,Na)(Nb,Sb,Ta)O₃:Mn (KNNLST:Mn) single crystals with an excellent piezoelectric coefficient d₃₃ of approximately 778 pC/N were prepared. Systematically studies of intrinsic and extrinsic piezoelectric responses have revealed that the high d₃₃ of KNNLST:Mn single crystals is related to the shear piezoelectric response of a single-domain state and irreversible domain wall motion of the engineering domains. Furthermore, the effect of the orthorhombic (O)-tetragonal (T) phase boundary on intrinsic and extrinsic piezoelectric response is systematically studied, and the impact mechanism is elucidated. The results indicate that a lower dielectric response and elastic constant limit the intrinsic shear piezoelectric response of KNNLST:Mn single crystals, and approaching the O–T phase boundary can enhance both intrinsic and extrinsic piezoelectric responses. This study improves our understanding of the structure-performance relationship in KNN-based single crystals and offers insights for optimizing piezoelectric properties in KNN-based materials.

(K,Na)NbO3 (KNN) 基压电材料是替代铅基材料的候选材料。然而，现有的 KNN 基单晶的压电特性仍不如 Pb 基松弛铁电单晶。此外，KNN 基单晶的压电响应机制仍不清楚。本研究制备了(Li,K,Na)(Nb,Sb,Ta)O3:Mn（KNNLST:Mn）单晶，其压电系数 d33 约为 778 pC/N。对内在和外在压电响应的系统研究表明，KNNLST:Mn 单晶的高 d33 与单畴状态的剪切压电响应和工程畴的不可逆畴壁运动有关。此外，还系统研究了正交（O）-四方（T）相界对内在和外在压电响应的影响，并阐明了其影响机理。结果表明，较低的介电响应和弹性常数限制了 KNNLST:Mn 单晶的本征剪切压电响应，而接近 O-T 相边界可以增强本征和外征压电响应。这项研究加深了我们对 KNN 基单晶的结构-性能关系的理解，并为优化 KNN 基材料的压电特性提供了启示。

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引用次数: 0

Genetic algorithm-enabled mechanical metamaterials for vibration isolation with different payloads 采用遗传算法的机械超材料用于不同有效载荷的振动隔离

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-10-15 DOI: 10.1016/j.jmat.2024.100944

Xinyu Song , Sen Yan , Yong Wang , Haojie Zhang , Jiacheng Xue , Tengfei Liu , Xiaoyong Tian , Lingling Wu , Hanqing Jiang , Dichen Li

Mechanical vibration isolation with adaptable payloads has always been one of the most challenging topics in mechanical engineering. In this study, we address this problem by introducing machine learning method to search for quasi-zero stiffness metamaterials with arbitrarily predetermined payloads and by employing multi-material 3D printing technology to fabricate them as an integrated part. Dynamic tests demonstrate that both the single- and multi-payload metamaterials can effectively isolate mechanical vibration in low frequency domain. Importantly, the payload of the metamaterial could be arbitrarily designed according to the application scenario and could function at multiple payloads. This design strategy opens new avenues for mechanical energy shielding under various scenarios and under variable loading conditions.

可适应有效载荷的机械隔振一直是机械工程领域最具挑战性的课题之一。在本研究中，我们通过引入机器学习方法来寻找具有任意预设有效载荷的准零刚度超材料，并采用多材料三维打印技术将其制造为一个集成部件，从而解决了这一问题。动态测试表明，单负载和多负载超材料都能有效隔离低频域的机械振动。重要的是，超材料的有效载荷可根据应用场景任意设计，并可在多种有效载荷下发挥作用。这种设计策略为在不同场景和不同负载条件下的机械能屏蔽开辟了新途径。

引用次数: 0

Advancing piezoelectricity and excellent thermal stability: <001>-textured 0.75BF–0.25BT lead-free ceramics for high temperature applications 先进的压电性和出色的热稳定性：用于高温应用的纹理 0.75BF-0.25BT 无铅陶瓷

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-10-13 DOI: 10.1016/j.jmat.2024.100946

Zhangpan Shen , Jian Guo , Xiaoyi Gao , Weidong Xuan , Jiye Zhang , Dawei Wang , Jinrong Cheng , Shujun Zhang , Jianguo Chen

There is an urgent need for piezoelectric materials possessing both high piezoelectric properties and good thermal stability to facilitate the advancement of high temperature piezoelectric devices. However, conventional strategy for enhancing piezoelectricity via chemical modifications often comes at the cost of thermal stability due to a drop in Curie temperatures. In this study, we achieved remarkable results in <001>-oriented 0.75BiFeO₃–0.25BaTiO₃ (0.75BF–0.25BT) lead-free textured ceramics. These textured ceramics exhibit a high Curie temperatures T_C of 552 °C, large piezoelectric coefficients d₃₃ of 265 pC/N, and exceptional piezoelectric thermal stability, with minimal variation of 8% across temperature from 25 °C to 300 °C. Compared to randomly oriented ceramics, the piezoelectric coefficient is about 2.5 times higher, marking it as one of the highest reported value for ceramics with T_c near 550 °C. The enhanced piezoelectric properties can be ascribed to improvements in both intrinsic lattice distortions and extrinsic non-180° domain motions, while the excellent piezoelectric thermal stability is attributed to the stable domain texture. These superior properties of the studied textured 0.75BF–0.25BT ceramics position them as competitive lead-free candidates for high-temperature piezoelectric applications.

为促进高温压电器件的发展，迫切需要同时具有高压电特性和良好热稳定性的压电材料。然而，通过化学修饰增强压电性的传统策略往往以居里温度下降导致热稳定性降低为代价。在这项研究中，我们在取向 0.75BiFeO3-0.25BaTiO3 （0.75BF-0.25BT）无铅纹理陶瓷中取得了令人瞩目的成果。这些纹理陶瓷的居里温度 Tc 高达 552 °C，压电系数 d33 高达 265 pC/N，并且具有优异的压电热稳定性，在 25 °C 至 300 °C 的温度范围内变化极小，仅为 8%。与随机取向陶瓷相比，其压电系数高出约 2.5 倍，是所报道的 Tc 接近 550 °C 的陶瓷中最高值之一。压电特性的增强可归因于内在晶格畸变和外在非 180o 畴运动的改善，而优异的压电热稳定性则归因于稳定的畴纹理。所研究的纹理 0.75BF-0.25BT 陶瓷的这些优异特性使其成为高温压电应用中具有竞争力的无铅候选材料。

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引用次数: 0

Ultrathin WOx interfacial layer improving the ferroelectricity and endurance of Hf0.5Zr0.5O2 thin films on polyimide 超薄 WOx 界面层可提高聚酰亚胺上 Hf0.5Zr0.5O2 薄膜的铁电性和耐久性

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materiomics

Pub Date : 2024-10-03 DOI: 10.1016/j.jmat.2024.100942

Chunxu Zhao , Huiping Wang , Xinyu Gu, Wei Zhang, Yubao Li

Here we report substantial effects of inserting PVD-prepared highly-conductive ultrathin WO_x as interfacial layer in TiN/Hf_0.5Zr_0.5O₂(HZO)/TiN structure on the ferroelectricity of HZO thin films. The prepared TiN/WO_x/HZO/WO_x/TiN capacitor, exhibiting a remnant polarization (P_r) of 18.8 μC/cm² at 2 MV/cm and outstanding endurance of over 3.2 × 10⁹ cycles under 10⁵ Hz bipolar square field cycling. Furthermore, a scalable transfer technique, in which CVD-grown few-layered graphene thin film is used as a sacrificial layer, is developed for transferring HZO-based ferroelectric stack pre-fabricated on SiO₂/Si substrate onto a flexible polyimide (PI) membrane, with marginal loss in the ferroelectric properties of HZO. Importantly, mechanical bending testing demonstrates excellent flexibility of TiN/WO_x/HZO/WO_x/TiN stack, with robust polarization and superb endurance properties being well-maintained even after 10⁴ cycles at a small bending radius of 2 mm. Both implementing ultrathin WO_x as interfacial layers and utilizing two-dimensional materials assisted transfer technique would be of great value in the development of HfO₂-based flexible ferroelectric memory.

在此，我们报告了在 TiN/Hf0.5Zr0.5O2（HZO）/TiN 结构中插入 PVD 制备的高导电性超薄 WOx 作为界面层对 HZO 薄膜铁电性的实质性影响。所制备的 TiN/WOx/HZO/WOx/TiN 电容器在 2 MV/cm 的条件下显示出 18.8 μC/cm2 的残余极化 (Pr)，在 105 Hz 双极性方场循环下显示出超过 3.2×109 周期的出色耐久性。此外，还开发了一种可扩展的转移技术，即使用 CVD 生长的少层石墨烯薄膜作为牺牲层，将预制在二氧化硅/硅衬底上的基于 HZO 的铁电堆栈转移到柔性聚酰亚胺（PI）膜上，而 HZO 的铁电特性损失甚微。重要的是，机械弯曲测试表明，TiN/WOx/HZO/WOx/TiN 叠层具有出色的柔韧性，即使在 2 毫米的较小弯曲半径下进行 104 次循环后，仍能保持稳定的极化和出色的耐久性能。采用超薄 WOx 作为界面层和利用二维材料辅助转移技术对于开发基于 HfO2 的柔性铁电存储器都具有重要价值。

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