Materials Research Express
·
2020
·Vol. 7
·期 1
·015204
·
IF 1.929
Ying Zhou,Guoyou Gan,Zhenhua Ge,Jing Feng
SmTaO4, Sm3TaO7 and SmTa3O9 ceramics were prepared via a high temperature solid-state reaction. The results show that the phase structures of the SmTaO4 ceramics are a monoclinic phase (space group: I2 (5)), the Sm3TaO7 ceramics are an ordered orthorhombic phase (space group: Ccmm), and the SmTa3O9 ceramics are an orthorhombic phase (space group: Cmmm). Macromolecular and crystal structures of Sm3TaO7 and SmTa3O9 are more complex than those of SmTaO4, which can enhance phonon scattering and reduce thermal conductivity. Compared with those of SmTaO4 and SmTa3O9, Sm3TaO7 has the smallest grain size, indicating that a small grain size has an effect on strength and ensures material stability. Because of a distorted TaO6 octahedron and a high concentration of cation vacancy in the lattice of SmTa3O9, its thermal conductivity increases with increasing temperature. Compared with that of 7–8 YSZ, Sm3TaO7 has a low thermal conductivity (1.3–1.7 W·m−1·K−1 at 100 °C–900 °C), and its minimum thermal conductivity is nearly 30% lower than that of YSZ. The Sm3TaO7 ceramics have the highest TECs at approximately 9.82 × 10−6 K−1 at 1200 °C, which is close to that of 7–8 YSZ (approximately 10 × 10−6). This indicates that Sm3TaO7 has the potential to be employed as a thermal barrier coating.
研究领域:
材料科学
·
热物理学
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DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Xu Lihui,Lin Jinfeng,Yang Yuxuan,Zhao Zhihao,Shi Xiaoming,Ge Guanglong,Qian Jin,Shi Cheng,Li Guohui,Wang Simin,Zhang Yang,Li Peng,Shen Bo,Fu Zhengqian,Wu Haijun,Huang Houbing,Li Fei,Ding Xiangdong,Sun Jun,Zhai Jiwei
The contradiction between high piezoelectricity and uniquely poor temperature stability generated by polymorphic phase boundary is a huge obstacle to high-performance (K, Na)NbO 3 -based ceramics entering the application market as Pb-based substitutes. We possess the phase boundary by mimicking Pb(Zr, Ti)O 3 ’s morphotropic phase boundary structure via the synergistic optimization of diffusion phase boundary and crystal orientation in 0.94(Na 0.56 K 0.44 )NbO 3 −0.03Bi 0.5 Na 0.5 ZrO 3 −0.03(Bi 0.5 K 0.5 )HfO 3 textured ceramics. As a result, a prominent comprehensive performance is obtained, including giant d 33 of 550 ± 30 pC/N and ultrahigh temperature stability ( d 33 change rate less than 1.2% within 25-150 °C), representing a significant breakthrough in lead-free piezoceramics, even surpassing the Pb-based piezoelectric ceramics. Within the same temperature range, the d 33 change rate of the commercial Pb(Zr, Ti)O 3 −5 ceramics is only about 10%, and more importantly, its d 33 (~ 350 pC/N) is much lower than that of the (K, Na)NbO 3 -based ceramics in this work. This study demonstrates a strategy for constructing the phase boundary with MPB feature, settling the problem of temperature instability in (K, Na)NbO 3 -based ceramics.
研究领域:
材料科学
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物理学
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DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 18
·
IF 4
Kong Xi,Yang Letao,Luo Zixi,Liu Yiqian,Lan Shun,Yang Bingbing,Meng Fanqi,Ren Weibin,Zhang Xinyue,Cai Jinghan,Lin Yuan-Hua,Guo Jinming,Nan Ce-Wen
Dielectric ceramics with high polarization and low sintering temperature are important for high-performance and low-cost multilayer ceramic capacitors (MLCCs). Herein, BiFeO 3 was added to a lead-free composition 0.48BaTiO 3 -0.4Bi(Mg 0.5 Hf 0.5 )O 3 -0.12SrTiO 3 to lower the sintering temperature and increase the polarization simultaneously. As a result, a low sintering temperature of 950 °C and high comprehensive energy storage properties with a recoverable energy density W rec of 5.7 J/cm 3 and an energy efficiency η of 92% at 450 kV/cm were achieved. Together with the good temperature stability and cycling stability of W rec and η , the ceramics exhibit great potential in the energy storage MLCCs with low-cost Ag-Pd electrodes with a high Ag content.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Xi Hu,Geqing Zhang,Haodong He,Chunjia Luo,Min Chao,Guodong Sun,Luke Yan
Polymer-derived ceramics (PDCs) are typically prepared as ceramic-based microwave absorption materials by doping with high-dielectric materials or transition metals, which may lead to the issue of uneven mixing. This study achieves uniform blending at the molecular level by using poly(dimethylsilylene)diacetylenes (PDSDA) to modify hyperbranched polyborosilazane (PBSZ). The alkynyl group and Si−H bonds crosslink to form a ceramic precursor, which is then pyrolyzed to prepare SiBCN ceramics with excellent microwave absorption performance and high temperature stability. The introduction of PDSDA significantly improved the ceramic yield, resulting in the in situ formation of more ordered carbon, SiC nanocrystals, and ceramic nanowires within the SiBCN ceramics. These nanophases are uniformly dispersed throughout the ceramic matrix, enhancing the ceramic's dielectric loss and microwave absorption properties. After pyrolyzed at 1400°C, the ceramic derived from the precursor with a PBSZ:PDSDA mass ratio of 10:1 exhibits excellent electromagnetic wave absorption properties, with a minimum reflection loss of −50.11 dB and a maximum effective absorption bandwidth of 3.11 GHz. Moreover, ceramics maintain excellent stability at 1500°C in both argon and air environments. This study fully exploits the designability of precursor molecules, providing a new approach for the preparation of microwave absorption materials from PDCs route.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 23
·13023-13030
·
IF 4.22
Bian Kan,Li Xiuxiu,Wang Yiping,Li Xiongjie,Sun Sheng,Feng Shuo,Yang Ying
Pb(Zr, Ti)O 3 (PZT)-based piezoelectric ceramics and Al 2 O 3 -based structural ceramics were cast and co-fired to prepare a layered piezoelectric ceramic/structural ceramic composite. Considering the significant differences in sintering characteristics of PZT- and Al 2 O 3- based ceramics, control of the sintering temperature and the dependence of the linear shrinkage on the solid content of the tape-casting films were systematically conducted at first. The sintering density and the interface bonding properties of the prepared composites were then investigated. The results of electrical and mechanical properties of the composite ceramics indicate: By using sintering aids, Al 2 O 3 ceramic could be fully densified and co-fired with PZT ceramic at 1150 °C. Shrinkage matching during sintering was achieved by adjusting the solid contents to 45 vol.% and 65 vol.% for PZT and alumina tape-casting films. In the layered composites, Al 2 O 3 structural ceramic presents an excellent mechanical property with HV hardness of 667, while the PZT functional ceramic presents d 33 , ε r and tanδ of 259 pC/N, 965 and 0.37%, respectively.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Lang Bian,Qian Wang,Shuai He,Jie Wu,Kai Li,Yingchun Liu,Bin Yang
A new ceramic system, Pb(Ni 1/3 Ta 2/3 )O 3 -PbZrO 3 -PbTiO 3 (PNT-PZT), was found to be able to be textured at low temperatures (≤ 1000 °C) without the addition of sintering aids. Textured 0.24PNT-0.34PZ-0.42PT ceramics with different template contents were successfully prepared at 1000 °C using BaTiO 3 platelets as templates. The phase structure, microstructure, electrical properties and strain-temperature stability of the ceramics were studied in detail. The 0.24PNT-0.34PZ-0.42PT-5 vol% BT ceramic has the best comprehensive properties ( d 33 = 820 pC/N, ε r = 2499, E C = 6.25 kV/cm， T C = 180 °C) and excellent temperature stability (strain variation ≤ 5% between 20 °C and 140 °C). Finally, multilayer textured piezoelectric ceramics were prepared and their displacement output characteristics were studied. The multilayer piezoelectric ceramics successfully exhibit excellent strain under small voltage driving. Our work provides a new candidate material for the development of a new generation of multilayer piezoelectric ceramics.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 2
·1159-1169
·
IF 4.186
Binfeng Zhao,Xianqiang Chen,Naichao Chen,Xinwei Xu,Yani Lu,Jin Cheng,Hong Wang
With the development of 5G/6G communication, the requirements of portable devices for miniaturization and multifunction make low-temperature co-fired ceramic (LTCC) more and more important. In the area of high-frequency high-density passive integration, microwave dielectric ceramics with a low dielectric loss and high thermal conductivity are urgently needed to ensure the effective signals transmission and system reliability. However, most microwave dielectric ceramics with a low dielectric loss were not applicable for the LTCC technology due to the high sintering temperature. In this work, a series of MgO-based ceramics [(100 − x ) wt.% MgO– x wt.% (0.2SrF 2 –0.8LiF) ( x = 5,7,10)] were prepared by solid-state reaction method. The addition of sintering aid 0.2SrF 2 –0.8LiF (S 2 L 8 ) decreased the sintering temperature below 880°C without degrading the microwave dielectric properties of ceramics. Microwave dielectric properties of ceramics, including quality factor Q × f , relative permittivity ε r , and temperature coefficient of resonant frequency τ f , were investigated to find the optimum composition and sintering temperature. In general, MgO–7 wt.% S 2 L 8 ceramic sintered at 860°C exhibits outstanding properties of Q × f = 180 233 GHz, ε r = 9.11, τ f = −40.33 ppm/°C, and a high thermal conductivity of 24.02 W/(m K). This series of ceramics are suitable to be co-fired with Ag electrodes. With all those great properties, this series of MgO-based ceramics are expected to be the candidates for LTCC applications in 5G/6G technology.
研究领域:
材料科学
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通信技术
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2021
·Vol. 19
·期 1
·480-487
·
IF 1.968
Hai-Tao Zhou,Zhe-Nan Xu,Jian-Yun Yan,Hao Huang,Yan-Bo Guo,Kang Du,Wen-Zhong Lu,Wen Lei
In the present study, (1 − x )BaAl 2 Si 2 O 8 − x CaSnSiO 5 − y wt.% LiF microwave dielectric ceramics were prepared through the traditional solid-state sintering at 950−1395°C for 5 h. The BaAl 2 Si 2 O 8 phase could coexist with the CaSnSiO 5 phase at (1 − x )BaAl 2 Si 2 O 8 − x CaSnSiO 5 (.2 ≤ x ≤ .6) ceramics, and no other secondary phase was observed. The CaSnSiO 5 , as a τ f regulator, adjusted the negative τ f value of BaAl 2 Si 2 O 8 to near zero. Excellent microwave dielectric properties ( ε r = 8.1, Q × f = 37 560 GHz, and τ f = −1.5 ppm/°C) were obtained from the 0.6BaAl 2 Si 2 O 8 −0.4CaSnSiO 5 ceramic. The sintering temperature of 0.6BaAl 2 Si 2 O 8 −0.4CaSnSiO 5 ceramic decreased from 1375°C to 950°C by introducing 2 wt.% LiF. The 0.6BaAl 2 Si 2 O 8 −0.4CaSnSiO 5 −2 wt% LiF ceramic exhibited remarkable microwave dielectric properties ( ε r = 7.6, Q × f = 17 420 GHz, and τ f = −12.2 ppm/°C) and could be applied to the low-temperature co-fired ceramic (LTCC) field.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 12
·7491-7499
·
IF 3.094
Ziyu Liu,Guido Toci,Angela Pirri,Barbara Patrizi,Jinbang Li,Zewang Hu,Jiabei Wei,Hongming Pan,Tengfei Xie,Matteo Vannini,Jiang Li
In this article, 5 at.% Yb:Lu 2 O 3 transparent ceramics were fabricated by vacuum sintering combined with hot isostatic pressing (HIP) posttreatment using co-precipitated nano-powders. The influence of precipitant molar ratio, ammonium hydrogen carbonate, to metal ions (AHC/M 3+ , R value) on the properties of Yb:Lu 2 O 3 precursors and calcined powders was investigated systematically. It was found that the powders with different R value calcined at 1100°C for 4 hours were pure cubic Lu 2 O 3 but the morphologies of precursors and powders behaved differently. The opaque samples pre-sintered at 1500°C for 2 hours grew into transparent ceramics after HIP posttreatment at 1750°C for 1 hour. The final ceramic with R = 4.8 showed the best optical quality with the in-line transmittance of 79.7% at 1100 nm. The quasi-CW laser operation was performed at 1034 nm and 1080 nm with a maximum output power up to 8.15 W as well as a corresponding slope efficiency of 58.4%.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Hongcheng Yang,Shuren Zhang,Qingyu Wen,Ying Yuan,Enzhu Li
Novel CaAl 2 x B 2 O 4+3 x ( x = 0.25, 0.5, 0.75, and 1) ceramics were prepared via solid-state reaction method. The investigation is concentrated on sintering behavior, phase composition and dielectric properties of CaAl 2 x B 2 O 4+3 x ceramics with various ratios of Al 2 O 3 content. The optimal sintering temperature and the content of CaAl 2 B 2 O 7 are highly related to the variation of x value. CaAl 2 x B 2 O 4+3 x ceramics possess excellent microwave dielectric properties: ε r = 5.8 ± 0.05, Q × f = 63,338 ± 2690 GHz (@13.57 GHz), and τ f =-29 ± 2 ppm/℃ when sintered at 940 ℃ for x = 0.5. Comparing the properties of CaAl 2 x B 2 O 4+3 x ceramics with reported borate ceramics, the ceramics prepared in this study with low dielectric loss and low sintering temperature have promising prospects in LTCC technology.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Fahai Dong,Nannan Zhu,Zhongya Zhang,Jiawei Jiang,Juhai Weng,Lijuan Zhang
This study successfully synthesized a novel SiCN ceramic precursor with high photosensitivity and ceramic yield through the addition reaction of Si-H and N-H groups in polysilazane (PSZ) with isocyanate groups in 2-isocyanoethyl methacrylate (IEM). The reaction mechanism between IEM and PSZ, and the curing and pyrolysis effects were investigated. The results showed that compared with 5 s exposure time, PSZ could not be cured, while the curing depth of PSZ could reach 1.51 mm after adding IEM chemical grafting modification, which significantly improved the curing printing efficiency. Increasing IEM content to 10 wt% reduced cure shrinkage from 13.85 % to 12.56 %, with a ceramic yield of 79.92 %. The bending strength of SiCN ceramic reached 30.7 MPa, and the microstructure of pyrolyzed samples was dense and free of defects. This research expands the application field of 3D-printed SiCN ceramics.
研究领域:
材料科学
·
高分子化学
·
陶瓷工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 5
·2316-2324
·
IF 2.956
Wanyu Zhao,Gang Shao,Shixian Han,Chunhui Cai,Xingcen Liu,Mengran Sun,Hailong Wang,Xinjian Li,Rui Zhang,Linan An
SiOCN ceramic aerogels with lightweight, high surface areas, and macro-meso pores have been synthesized by a facile method combining freeze-drying technique and polymer-derived ceramic route. The wet gels are synthesized via the hydrosilylation reaction between polysilazane and divinylbenzene with cyclohexane as solvent. The solvent is then removed by a freeze-drying process to form pre-ceramic aerogels. The SiOCN ceramic aerogels are finally obtained by pyrolyzing the pre-ceramic aerogels at 1000°C in ultrahigh purity N 2 . The thermogravimetric and mass spectrometry system (TG/DSC-MS) is used to investigate the polymer-to-ceramic conversion process during pyrolysis. The phase composition, structure, and morphology of the SiOCN ceramic aerogels are investigated by XRD, FT-IR, XPS, and SEM. The results show that SiOCN ceramic aerogels are composed of amorphous matrix phase and “free carbon” phase. The SiOCN aerogels possess three-dimensional (3D) network porous structure with low density (0.19 g/cm 3 ), high specific surface area (134 m 2 /g), large pore volume (0.49 cm 3 /g), and hierarchical pore structures of both macro and meso pores. The formation mechanism and evolution process of SiOCN ceramic aerogels are discussed.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）