CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shi-min Chen,Qun Zeng,Fu-song Ma,Yi-hang Wang,Chun-feng Yao
Novel Li 1.0 Nb 0.6 Ti 0.5 O 3 : Tb 3+ ceramics with favorable luminescent and dielectric properties were prepared by solid-state reaction (SSR) method. The X-ray diffraction (XRD) results indicated that the Tb 3+ ions were effectively dissolved into the “M-phase” matrix synthesized at 1000–1100°C. The ceramic with a dense microstructure could be obtained at 1050°C. The Li 1.0 Nb 0.6 Ti 0.5 O 3 : Tb 3+ ceramics emitted green light at 550 nm and relatively strong red light at 660 nm under the excitation of 440 nm, which were located in the orange-red light region shown in the chromaticity diagram. The color coordinates were (0.5574, 0.4417) for the Li 1.0 Nb 0.6 Ti 0.5 O 3 : 2wt% Tb 3+ ceramic sintered at 1050°C. The quantum efficiency of Li 1.0 Nb 0.6 Ti 0.5 O 3 : 2wt%Tb 3+ ceramic was 19%, which was much higher than that of 9.6% for commercial red Y 2 O 3 : Eu 3+ phosphors. Furthermore, for Li 1.0 Nb 0.6 Ti 0.5 O 3 : 2wt%Tb 3+ ceramic synthesized at 1050°C, the ideal dielectric properties with ε r of 66.263 and Q*f of 5582 GHz were obtained, which might be used as a potentially multifunctional ceramic applied in the fields of LED packaging to improve the lack of red light for blue LEDs combined with yellow phosphors.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Kaiqiang Wu,Dongjie Wang,Xiaoting Lin,Lianyi Shao,Miao Shui,Xinxin Jiang,Nengbing Long,Yuanlong Ren,Jie Shu
In this paper, Na 2 Li 2 Ti 6 O 14 anode materials are synthesized by solid-state reaction and sol–gel method, respectively. Sol–gel formed Na 2 Li 2 Ti 6 O 14 shows smaller particle size (0.05–0.1 μm) than that (0.2–0.4 μm) of samples prepared by solid-state reaction. Electrochemical results show that all the four samples have similar reduction peak at 1.20 V and oxidation peak at 1.35 V with average working potential of 1.28 V. Among all the as-obtained compounds, Na 2 Li 2 Ti 6 O 14 synthesized by sol–gel method at 700 °C shows the highest initial charge specific capacity of 106.6 mA h g −1 . After 40 cycles, the reversible charge capacity can be maintained at 114.7 mA h g −1 . Moreover, this sample shows excellent rate properties with a high reversible charge capacity of 110 mA h g −1 at 160 mA g −1 . The improved electrochemical performance is attributed to the proper particle size, high specific surface area and decreased electrochemical resistances. Therefore, Na 2 Li 2 Ti 6 O 14 prepared from sol to gel technique will be a promising high-power anode material for rechargeable lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic and Nano-Metal Chemistry
·
2022
·
IF 1.514
Zhiqiang Ding,Gongsheng Ding,Ling Fang,Zifei Peng
Red nanofluorescent materials based on CaWO4:Eu3+ were prepared by the molten salt method. Spherical CaWO4 particles with a size of 100 nm to 200 nm monodisperse sizes were prepared using different types of calcium salts. The KCl was chosen as the molten salt, under the same other experimental parameters, the obtained CaWO4:Eu3+ particles were more uniform, the diffraction properties were better. With a molar ratio of 15 for molten salt and Calcium salt, more spherical CaWO4:Eu3+ particles were produced small and sand homogeneous size. Using different amount of molten salt, it was found that the larger the amount of molten salt, the weaker the fluorescence property. Finally, by comparing the products obtained by the molten salt method with the solid state reaction method, it is found that the luminescence intensity of the products is 20% higher than that obtained by the solid state reaction method.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 6
·1714-1716
·
IF 2.61
Song Hu,Xianpeng Qin,Chunhua Lu,Guohong Zhou,Zhongzi Xu,Shiwei Wang
Polycrystalline, transparent Dy 3 Al 5 O 12 ceramics were firstly fabricated by a solid-state reaction method using high-purity Dy 2 O 3 and Al 2 O 3 powders. The fully dense Dy 3 Al 5 O 12 ceramic with an average grain size of less than 10 μm was obtained by vacuum sintering at 1820°C for 6 h. The in-line transmittance of the optimized sample reaches 80% in the visible region. Scanning electron microscopy reveals that no secondary phases and almost no pores are observed at grain boundaries or triple junctions, and the fracture mode of the ceramic is mainly transgranular. The Dy 3 Al 5 O 12 ceramic is promising for magneto-optical applications. Verdet constant of the Dy 3 Al 5 O 12 transparent ceramic is as high as −0.41 min·(Oe·cm) −1 .
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
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Xiaojing Bai,Qihuang Deng,Yingjie Qiao,Nianxiang Qiu,Xianhu Zha,Jie Zhou,Kan Luo,Yuhong Zhou,Qing Huang,Shiyu Du
This article presents the theoretical predictions and experimental synthesis of the uranium-containing layered ternary carbides UAl 3 C 3 and U 2 Al 3 C 4 . The electronic structures and mechanical properties of UAl 3 C 3 and U 2 Al 3 C 4 have been investigated by first-principles computations. The chemical bonding characteristics of UAl 3 C 3 and U 2 Al 3 C 4 have been compared to those of nanolaminated ternary carbides and strong interactions have been found between uranium and carbon atoms. Furthermore, UAl 3 C 3 and U 2 Al 3 C 4 powders have been fabricated by the solid state reaction method and the crystal structures of UAl 3 C 3 and U 2 Al 3 C 4 have been determined by X-ray diffraction (XRD). Based on the present results, the layered ternary carbides UAl 3 C 3 and U 2 Al 3 C 4 may provide an expansion of the derivative MAX phase (layered compounds) family as well as a new option for nuclear fuels.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 10
·5133-5139
·
IF 1.491
Ullah Atta,Liu Hanxing,Hao Hua,Iqbal Javed,Yao Zhonghua,Cao Minghe,Xu Qi
The ceramics were prepared using the solid-state reaction method and their phase, microstructure and microwave dielectric properties were investigated. A single-phase clinoenstatite system with monoclinic structure (space group P2 1 /c) was confirmed through x-ray diffraction (XRD) analysis for the compositions with x ≤ 0.1. The compositions with x ≥ 0.15 contain SiO 2 and (Mg 1− x
Ni
x
) 2 SiO 4 phases only as confirmed from the XRD data of their sintered samples. The unit cell volume was decreased while the theoretical density was increased with increase in x from 0 to 0.1. A decrease in dielectric constant ( ε
r ) while an increase in unloaded quality factor multiplying the resonant frequency ( Q
u
f
o ) and temperature coefficient of resonant frequency ( τ
f ) was observed with increase in Ni content from 0 to x = 0.1. In the present study, ε
r ∼ 6.10, Q
u
f
o ∼ 118,702 GHz and τ
f ∼ −10 ppm/°C was achieved for the composition with x = 0.1 sintered at 1425°C for 9 h. The material is a good candidate for millimeter wave applications.
研究领域:
材料科学
·
陶瓷学
·
物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yutong Meng,Qi Yuan,Sen Wang
Novel high-entropy Li 2 (Mg 0.2 Mn 0.2 Co 0.2 Ni 0.2 Zn 0.2 ) 2 Mo 3 O 12 ceramics (LAM) were prepared by solid-phase reaction method. LAM ceramics have a pure phase with a single orthorhombic structure and a space group of Pnma (62). The grain size increases gradually with the increase of sintering temperature and the distribution of each solid solution element is uniform. The ceramic samples sintered at 625 °C have excellent microwave dielectric properties (ε r = 9.82 ± 0.13, Q × f = 20,514 ± 261 GHz, τ f = −67.74 ± 1.63 ppm/°C) and are analyzed in conjunction with the P-V-L theory for microwave dielectric properties. In addition to this, the high entropy design increases the Vickers hardness and compressive strength of LAM ceramics to 4.54 ± 0.13 GPa and 441 ± 34 MPa, respectively.
研究领域:
材料科学
·
陶瓷工程
·
微波技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Fang Sun,Xueyu Pang,Jianqiang Wei,Jing Zeng,Jiacheng Niu
Understanding the synthesis process of Portland cement's various mineral phases and the phase interactions during hydration is highly critical for the design and optimization of cement-based materials. In this work, by using an optimized solid-state reaction method, three pure clinker phases (alite, belite and ferrite) and two polyphase phases (alite-belite and alite-ferrite-belite) of Portland cement were synthesized. The optimized method is featured with high-quality product yield, short burning time without regrinding or reburning. The factors that influence synthesis results, such as crystallinity/purity of the synthesized pure phases, were discussed based on X-ray powder diffraction (XRD) tests along with Rietveld refinement analysis with an external standard. The hydration behavior of the synthesized phases in monophase, polyphase as well as mixture states was investigated via isothermal calorimetry along with thermogravimetry and XRD. The results indicate that alite and belite have relatively little interactions during hydration, while the hydration rate of ferrite can be strongly inhibited in the presence of alite both in mixture and polyphase states.
研究领域:
材料科学
·
水泥化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2022
·
IF 3.097
Qingkai Yang,Haiqing Qin,Kailin Huang,Rui Zhang,Lu Yang,Zhao Lu,Qingrong Yao,Lichun Cheng,Caimin Huang,Qianxin Long,Jiang Wang,Huaiying Zhou
To investigate the magnetic and microwave absorption properties of PrFeO 3 ceramic, the traditional solid-state reaction and sol–gel methods were used. The results show that only an orthorhombic crystal structure was detected by X-ray diffraction and transmission electron microscopy. Interestingly, heat treatment can greatly improve the coercivity of PrFeO 3 ceramic and thus change the magnetic properties from antiferromagnetic to ferromagnetic. The high correlation between the magnetization parameters and bonding characteristics indicated that signifificant contracting of the Fe 3+ O c 2− bonds and decrease in Fe 3+ O d 2− Fe 3+ linkage angles were the main origins of the strong ferromagnetism in the PrFeO 3 ceramic. The PrFeO 3 sample prepared by sol–gel method has good reflection loss. When the simulated thickness is 2 mm, the reflection loss reaches −36.87 dB at 15.92 GHz. The preparation process of the sol–gel method is simple and can be used to synthesize single phase at low temperature, but it is only suitable for the synthesis and performance testing of single phase. The solid-state reation method can be used to determine the phase relationship and phase properties, but it requires high temperature and long annealing time. The experimental results show that the sol–gel method is more suitable for the study of material properties. These results demonstrate the potential application of PrFeO 3 ceramics in magnetic materials and microwave absorbing field.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2024
·
IF 2.7
Zhiliang Guo,Helin Wang,Changgan Lai,Shuai Ji,Jian Sun,Donghuai Zhang,Liu Nie,Lixu Lei
In recent years, a variety of nanomaterial synthesis methods have been used to explore the preparation of metal–organic frameworks (MOFs). The zeolitic imidazolate frameworks (ZIFs), are typically synthesized through high cost and environmentally unfriendly solvothermal methods, require a large amount of organic solvents, and have extremely low yields. Therefore, exploring scalable and environmentally friendly synthesis routes for ZIFs is crucial. The metal oxide and 2-methylimidazole are completely converted into submicron size ZIFs in stoichiometric ratio via less solvent solid state reaction (LSR) method. The ZIFs synthesized by LSR method have good crystallinity, large specific surface area, and the use of tiny solvent amount can achieve a yield of nearly 100%, which solves the problems of low yield and serious waste of solvent in the synthesis of ZIFs by traditional methods. Additionally, the fabricated ZIFs derived materials through high-temperature pyrolysis have high specific surface area, nitrogen rich content, and excellent chemical stability, being favorable for promoting the adsorption of organic dyes. The adsorption capacity of ZIF-8 derived materials fabricated by the LSR method for organic dyes is significantly better than that of ZIF-67 and bimetallic ZIFs (BZIFs) derived materials. Compared with the traditional method, the LSR method is a green and scalable manner to synthesize submicron ZIFs materials, paving the way for the preparation of various ZIFs with different metal centers, and also providing a new strategy for the commercial production of ZIFs derived materials widely used in the environment protection.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 13
·17946-17952
·
IF 2.478
Deng Guangwen,Qing Zhenjun,Cheng Jiawen,Wang Jin,Zhao Yun,Li Haiyan
The solid-phase reaction method was adopted to prepare BaNi 2 V 2 O 8 ceramic with high relative density. The influences of the sintering process on the densification, microstructure, microwave dielectric properties, growth of grains, and composition of crystalline phase were analyzed in this article. In particular, the microwave dielectric properties of BaNi 2 V 2 O 8 ceramic should be first reported by us. The microstructures and crystalline phase of BaNi 2 V 2 O 8 ceramic were analyzed using a scanning electron microscope and X-ray diffractometer. BaNi 2 V 2 O 8 with rhombohedral structure and space group of R-3 was observed as the only crystalline phase. The ceramic that achieved the best sintering densification was considered to be a sample sintered at 950 °C for 4 h as seen from the results of microstructure and relative density. The relative density was considered to be the key factor to determine the ε r and Q × f value. Variation of the sintering process had little effect on the τ f values. The BaNi 2 V 2 O 8 sample fired at 950 °C for 4 h showed a low ε r value of 11.71, an excellent Q × f value of 48,350 GHz, and a relatively negative τ f value of − 49.2 ppm/°C.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
FERROELECTRICS
·
2016
·
IF 0.491
Sun Hai-Qin,Zhang Qi-Wei,Li Wen-Xin
The photoluminescence of Tb3+-doped (Bi0.5Na0.5)TiO3 (BNT) ferroelectric materials fabricated via the conventional solid-sate reaction method were studied. Under blue light excitation (487 nm), a bright green emission centered at 547 nm is observed at room temperature, originating from the 5D4→7F5 transition of Tb3+ ions. The emission intensity reached its maximum as the doping concentration is 0.02 mol and sintering temperature is 1080°C, respectively. The CIE chromaticity coordinate for x = 0.02 is (0.3222, 0.6711), located in the green light region. These results show that Tb3+-doped BNT materials may have potential applications in white light-emitting diodes and novel multifunctional devices.
研究领域:
材料科学
·
光学
✓ 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）