ACS Applied Optical Materials
·
2024
·
IF 0
Junchi Li,Junhui Ran,Jia Liu,Chuanjun Tu,Yongbo Yuan,Bin Yang
Bulk ceramics of lead halide perovskites hold great promise for developing low-cost and high-performance optoelectronic devices. However, the preparation of perovskite bulk ceramics is still a significant challenge. Here, we have demonstrated that size-tunable bulk ceramics of CsPbBr3 can be achieved by employing solid-state sintering at 550 °C in an air furnace as using traditional oxide ceramics sintering for our reference in this work. Compared to one-step sintering, we found that two-step sintering allowed us to obtain dense CsPbBr3 ceramics that showed clearcut grains and grain boundaries. The devices based on the as-sintered CsPbBr3 bulk ceramics exhibited narrow-band photodetection performance under the positively biased condition. The narrow-band photodetectors showed a specific photodetectivity of 1.03 × 1011 Jones at 551 nm along with a small full width at half-maximum of ∼20 nm. Our work paves a feasible road of preparing perovskite bulk ceramics with solid-state sintering, which is critically important for slicing bulk ceramics of lead halide perovskites toward low-cost photodetector arrays and photovoltaic panels.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
Materials Today Communications
·
2023
·
IF 3.8
Jingxin Tian,Hongjun Zhang,Liwei Zhang,Dongliang Wang,Yong Huang,Elena Balashova,Boris Krichevtsov,Hua Ke
The effects of oxygen vacancies on electric properties of high valence ions (Mo/Zr/Ti) doped Bi 0.85 Nd 0.15 FeO 3 (marked as BNFM, BNFZ, BNFT) ceramics with morphotropic phase boundary (MPB) are investigated. MPB structures consisting of rhombohedral, intermediate and orthorhombic phases exist in all samples, which is confirmed by the XRD Rietveld refinements and TEM analyses. The BNFT has the maximum remnant polarization of 34.5 μC/cm 2 at 180 kV/cm, owing to its lowest paraelectric orthorhombic phase content. XPS and impedance results reveal that the BNFT ceramic has the relatively low oxygen vacancy contents and the largest impedance value, which is beneficial for the ferroelectric test. The best comprehensive properties of BNFT open wide prospects for improving BiFeO 3 -based ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ningning Dong,Yuan zhang,Jinwei Guan,Li Guo,Lu Liu,Liuxin Chao,Li Yang,Wei Zheng,Zhengming Sun,Guobing Ying
Preeminent mechanical and dielectric performances are demonstrated by covalently bonded Si 3 N 4 ceramics, yet their application range is still challenged because of limited toughness and sintering density. In this work, the Si 3 N 4 f /BN i fibrous monolithic ceramic with uniaxially arranged Si 3 N 4 fibers cells separated by BN interfaces were successfully synthesized via hot-pressed sintering based on bionic structural design. The Si 3 N 4 f /BN i fibrous monolithic ceramics with bionic structure exhibited flexural strength, fracture toughness, and density of up to 501 MPa, 10.99 MPa m 1/2 , and 3.43 g/cm 3 , respectively. The results revealed that bionic structural design enables to significantly increase the toughness of the ceramic without sacrificing its strength. Furthermore, an original model for determining the flexural strength of fibrous monolithic ceramics was proposed, which can account for various shapes of fibrous cells. The findings of this research open up new prospects for achieving competitive mechanical performance of ceramics.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 16
·13111-13117
·
IF 2.22
Chakrabarti Chiranjib,Fu Qingshan,Ali Wajahat,Chen Xinghan,Zheng Jia,Qiu Yang,Yuan Songliu
In this investigation, a series of (1 − x ) Bi 1− y Ho y FeO 3 – x Ba 0.8 Ca 0.2 TiO 3 (0.25 ≤ x ≤ 0.4; y = 0.025) ceramic solid solutions were synthesized using a conventional solid-state reaction route. The primary goal of this study was to perceive the significance of substitution on the structural, magnetic, dielectric, and resistive properties of the ceramic solid solution. The investigation suggested the trace of weak ferromagnetism in all of the samples. A methodical XRD-based phase structural study revealed a presence of a morphotropic phase boundary (MPB) in the range of 0.3 ≤ x ≤ 0.35, showing robust dielectric properties in the MPB region, as verified by the dielectric measurements. A room temperature A.C conductivity study and activation energy calculation advocated an improved resistive property in the x = 0.3 sample.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Minghui Zhou,Jun Sun,Bei Zhang,Youjie Hua,Feifei Huang,Hongping Ma,Renguang Ye,Shiqing Xu
Phosphor-in-ceramic (PiC) has garnered considerable attention in high-power white laser lighting owing to its advantages, such as high efficiency and good thermal stability. In this study, a transparent hydroxyapatite (HA) ceramic was successfully prepared via spark-plasma sintering (SPS) under relatively mild conditions. A series of ultra-high efficiency green-emitting PiCs were obtained by pure HA ceramics with 1–12% Lu 3 Al 5 O 12 : Ce (LuAG) phosphors. Owing to the rapid sintering of SPS and the stability of HA ceramics, HA ceramic matrix has high transparency, and does not damage the crystal structure of the LuAG phosphor. When excited by a blue laser, the HA-LuAG PiC exhibited an excellent luminous efficacy of 300.48 lm·W −1 . The fluorescence saturation threshold of the laser power was approximately 7.90 W. These results demonstrate that HA-LuAG PiCs have great potential for applications as efficient green-emitting phosphor conversion materials for high-power laser lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
C. Ji,T. Fan,G. Chen,X. Bai,J. Wang,J. He,W. Cai,R. Gao,X. Deng,Z. Wang,X. Lei,C. Fu
The (1- x )BiFeO 3 - x BaTiO 3 (short for (1- x )BFO- x BTO, x = 0.2–0.4) ceramics were prepared by solid-state reaction with microwave sintering (MWS) and conventional sintering (CS) methods. The crystal structure, microstructures, dielectric properties , ferroelectric properties , and magnetic properties of BFO-BTO ceramics sintered by MWS and CS were systematically investigated. It is found that the MWS can effectively decrease the grain size and enhance the compactness of BFO-BTO ceramics. The X-ray diffraction (XRD) results confirm that all ceramics exhibit a single perovskite structure, and the phase transforms from rhombohedral in BiFeO 3 -rich compositions to pseudo-cubic phase gradually as x increases. Introducing BTO into BFO can strengthen its dielectric relaxation behavior. Compared with CS, the MWS samples have a lower remanent polarization ( P r ) and a smaller coercive field ( E c ) under the same electric field. Therefore, MWS contributes to the decrease of dielectric loss. Addition of BTO can contribute to the reduction of the coercive force ( H c ) of BFO-based ceramic, and so decrease the hysteresis loss. At the same time, its remanent magnetization ( M r ) value can be decreased by introducing BTO into BFO and using MWS method. The present research provides a route for decreasing the dielectric loss and hysteresis loss of BiFeO 3 -based ceramics using the MWS method.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Xiao-Juan He,Ling Li,Zhong-Shuai Xie,Yi-Chi Zhang,Ji Zhang,Zheng-Bin Gu,Haibo Zhang,Guoliang Yuan,Shan-Tao Zhang
Solid solution ceramics of (1- x )Sr 0.75 Ba 0.25 Nb 2 O 6 - x PbZr 0.52 Ti 0.48 O 3 ( x = 0−0.4) were prepared and investigated. The phase evolves from tungsten bronze for x = 0, coexisted tungsten bronze and pyrochlore at x = 0.3, to pyrochlore for x > 0.3. As the results, the ceramics show dramatically composition dependent microstructure and electrical property. The grain shape changes from anisotropic pillar-like with maximum length-diameter ratio of 3.3 at x = 0.2 to isotropic cubic-like for x > 0.2. At the same time, the maximum dielectric constant temperature tends to decrease with an exceptional increase at x = 0.3 due to the coexisted phases. Interestingly, the x = 0.3 ceramic endures ultrahigh breakdown strength of 340 kV/cm, which, together with enhanced polarization, results in maximum recoverable energy storage density of 3.0 J/cm 3 and energy storage efficiency of 81.5 % at room temperature.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 27
·14316-14325
·
IF 14.511
Tao Cui,Ji Zhang,Jian Guo,Xiongjie Li,Shun Guo,Yu Huan,Jing Wang,Shan-Tao Zhang
Ceramic-based dielectric capacitors have attracted ever-increasing interest owing to their wide applications in high-power and pulsed-power electronic systems. Nevertheless, synchronously achieving ultrahigh recoverable energy storage density (Wrec) and high efficiency (η) in dielectric ceramics is still a great challenge. Herein, when lead-free Bi0.9La0.1FeO3–Ba0.7Sr0.3TiO3–K0.5Na0.5NbO3 ceramics with a high disorder degree at the atomic scale was systematically explored, it exhibited an ultrahigh Wrec of 13.9 J cm−3 and high η of 89.6% due to the synergistic contribution of high maximum polarization Pmax, small remanent polarization Pr and large breakdown strength Eb. The high Pmax is generated because of the genes of BiFeO3, while the small Pr originates from the significantly enhanced relaxor behavior. In particular, the large Eb stems from multiple intrinsic and extrinsic factors, such as the decreased average grain size at the submicron scale and promoted electrical microstructure. Moreover, the ceramics displayed exceptional reliability and giant power density. These results not only demonstrate the great potential of BiFeO3-based dielectric ceramics in energy storage applications but also pave a feasible way to develop novel lead-free dielectric capacitors with extraordinary energy storage properties.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Gang Chen,Xiaodong Peng,Chunlin Fu,Wei Cai,Rongli Gao,Peigeng Fan,Xin Yi,Hongqi Yang,Cong Ji,Hualei Yong
(0.95– x ) BaTiO 3 –0.05 BiYbO 3 – x BiFeO 3 ( x = 0, 0.01, 0.02, and 0.04) (abbreviated as (0.95– x ) BT–0.05 BY– x BFO) ceramics were fabricated by conventional sintering (CS) and microwave sintering (WS) methods. Effects of sintering method and BFO dopant on the microstructure and electric properties of (0.95– x ) BT–0.05 BY– x BFO ceramics were comparatively investigated. X-ray diffraction showed that all CS and WS samples presented a single perovskite phase. It was also found that WS ceramics possessed denser microstructure and finer grains compared to CS samples as indicated by the surface morphology characterization. Dielectric measurements revealed that all samples exhibited the weak relaxation behavior; however, the degree of relaxation behavior of BT–BY based ceramic could be strengthened by addition of BFO and by WS method. Moreover, the temperature and frequency stability could be improved with doped BFO. The density of 0.93BT–0.05BY–0.02BFO ceramic was found to be the largest while that of 0.94BT–0.05BY–0.01BFO ceramic was the smallest, thus, the dielectric constant of 0.93BT–0.05BY–0.02BFO was significantly larger than that of 0.94BT–0.05BY–0.01BFO and 0.94BT–0.05BY–0.04 BFO ceramics. minimum dielectric constant of (0.95– x ) BT–0.05 BY– x BFO ceramic was obtained at x = 0.01. Ferroelectric measurements indicated that all samples showed the slim hysteresis loop. The remnant polarization ( P r ) and coercive field ( E C ) of (0.95– x ) BT–0.05 BY– x BFO ceramics first decreased and then increased with increasing x ，the minimum values were obtained at x = 0.01. Moreover, P r and E C of WS ceramics were slightly larger than those of CS ceramics, indicating that higher density and larger grain sizes contributed to enhancing the ferroelectric characteristic. These findings indicate that addition of moderate amount of BFO and use of WS technique can strengthen the degree of relaxation behavior and improve the ferroelectric properties of BT–BY based ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of the Australian Ceramic Society
·
2024
·
IF 1.8
Lin Jia,Wang Shuai,Yang Yihang,Huang Guimei,Wang Jinhuo
In this study, Zr-modified Si-O-C precursor ceramics were prepared using three-dimensional (3D) printing. Ceramic sintering was completed by printing four precursors containing different zirconium acetylacetone contents. Comparative analysis was conducted on the ceramic yield, size shrinkage, mechanical properties, and microstructure. The results showed that the ceramic yield and size shrinkage of the four samples were increased with the increasing zirconium acetylacetone contents. The sample containing 30 wt% zirconium acetylacetone exhibited good compressive performance, with a compressive strength of 50.2 ± 0.6 MPa. Cracks were observed on the surface of samples containing 40 wt% zirconium acetylacetone, while those containing 10, 20, and 30 wt% zirconium acetylacetone were relatively intact. Therefore, a stable Si-Zr-O-C precursor ceramic with good mechanical properties, which can be used for 3D printing, was obtained.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Yuanming Zhou,Zhenxiao Tang,Ruizhi Liu,Zhe Zhou,Maozhong Yi,Ke Peng
To further enhance the ablation resistance of C/C composites, solid solution ceramic Ta 0.2 Zr 0.8 C was used to replace traditional ultra-high-temperature ceramic carbides for matrix modification of C/C composites. The C/C-Ta 0.2 Zr 0.8 C-SiC composite was fabricated by a high-solid-loading slurry impregnation combined with the precursor infiltration and pyrolysis process. The comparative samples of C/C-ZrC-SiC and C/C-TaC-SiC were also prepared using these same technologies. The microstructure, flexural properties, and ablation performance of the composite were investigated. Results showed that the C/C-Ta 0.2 Zr 0.8 C-SiC exhibited excellent overall flexural properties. During the ablation test under an oxyacetylene flame with high heat flux, the ablation resistance of C/C-Ta 0.2 Zr 0.8 C-SiC improved with prolonged ablation time, reaching mass and linear ablation rates of 0.67 mg/s and 0.18 μm/s after 120 s of ablation. Compared to the C/C-ZrC-SiC and C/C-TaC-SiC, the mass ablation rate of the composite was reduced by 49.24% and 68.70%, and the linear ablation rate was reduced by 97.22% and 97.71%, respectively. The enhanced ablation resistance was primarily attributed to the formation of the Ta-Zr-O oxide layer, composed of TaZr 2.75 O 8 , ZrO 2 , and Ta 2 O 5 , on the composites surface. In the oxide layer, the Ta-rich oxides served as a binder, filling gaps in the interface. Meanwhile, the Zr-rich oxides formed the skeleton that pinned the molten liquid oxides. The combined effects of Ta-rich and Zr-rich oxides made the Ta-Zr-O oxide layer more compact and strongly bonded to the matrix.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xinxi Zeng,Fanzhao Zhang,Xiaoqing Xi,Han Zhang,Bingcheng Luo,Pengfei Zhu,Guowu Li,Bo Li,Ji Zhou
Ferrites are widely used in the preparation of basic components that function within the microwave band. Compared with ferromagnetic ferrites, which possess a weak internal anisotropy field so that the working frequency of ferrite ceramics cannot be increased into the terahertz band, antiferromagnetic rare earth orthoferrites undergo strong interactions on the order of 100 T so that terahertz (THz) resonances can be supported. However, the zero or near-zero magnetization and internal dipolar fields complicate the manipulation of the THz responses in antiferromagnets using the traditional magnetic method. In this article, we choose PrFeO 3 as a model of rare earth orthoferrites and report a method of cooling and thickening to tune the THz resonances and absorptions. A combination of tuned time- and frequency-domain spectroscopic responses, including variations in amplitude with the time delay, changes in the transmittance, the peak height, the extinction coefficient κ , dissipation factor tan δ , and absorption coefficient α , which varied with frequency, reveal that our approach is effective. In this work, the resonant frequency of ferrites is promoted to the THz band, providing a highly effective approach for exciting and tuning their resonances and absorptions and offering support for the application of ferrite ceramics in the field of terahertz devices.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）