JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2013
·Vol. 96
·期 7
·2046-2049
·
IF 2.107
Songping Wu,Qing Ma,Fan He
Zn 2 GeO 4 ceramic materials were synthesized by the solid-state method. Zn 2 GeO 4 powders were investigated with X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Oxygen defects in the Zn 2 GeO 4 ceramics were investigated by photoluminescence, Raman, and EDS spectra. Conductivity of Zn 2 GeO 4 was 0.18 S/cm at low temperature of 773 K, and its activation energy was 0.49 eV. The results showed that Zn 2 GeO 4 was a promising low-temperature electrolyte with high conductivity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 20
·期 8
·2331-2335
·
IF 2.327
Han Jin,Niu Yubin,Zhang Yan,Jiang Jian,Bao Shu-juan,Xu Maowen
Novel O3-type Na 0.8 Ni 0.6 Sb 0.4 O 2 is successfully fabricated via a solid-state method and further firstly used as cathode material for sodium-ion batteries (SIBs). The as-obtained material delivers a high capacity of ~107.3 mAh g −1 in the voltage range of 2–4.5 V with two discharge plateaus at 3.24 and 3.62 V, and exhibits a good capacity retention (98.5 mAh g −1 at the rate of 0.2 C after 100 cycles).
研究领域:
电化学
·
材料科学
·
能源存储
·
无机化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Qiang Zhang,Xicheng Wang,Yuhua Wang
Due to the complicated production process and reabsorption problem, the development and application for white light-emitting diodes (WLEDs) are affected. A combination of cyan and red phosphors with near-ultraviolet (n-UV) LED chip has been proposed to solve these problems. Its key is developing cyan phosphor with broad emission band and excellent performances. In this work, we have developed a broadband cyan-emitting phosphor RbBa 2 (PO 3 ) 5 : Eu 2+ (RBP: Eu 2+ ) by a solid-state method. The phase purity, crystal structure, luminescence properties and their relationship were investigated systematically. The RBP: Eu 2+ phosphor can yield asymmetric broadband cyan emission upon 350 nm light excitation , which is ascribed to the occupation of Eu 2+ for both the Ba1 and Ba2 sites. The measurement of temperature-dependent luminescence implies that the phosphor remains 89.5% of the initial value at 150 °C, which is much better than the commercial Ba 2 SiO 4 : Eu 2+ phosphor. Furthermore, a WLED device has been obtained by composing the RBP: 0.01Eu 2+ and CaAlSiN 3 : Eu 2+ phosphors with a 365 nm LED chip. The emitted white light can show fabulous performances with the color coordinates of (0.3792, 0.3359), correlated color temperature of 3841 K and CRI of 90.8. The results suggest the RBP: Eu 2+ phosphor to be a promising candidate for high-power WLEDs.
研究领域:
材料科学
·
发光材料
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半导体照明
·
无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Jing Zhong,Jian Gu,Kai-da Zhu,Xin-ru Wang,Sen-lin Wang
Adding lead-carbon composite materials to the negative plate of lead-acid batteries can effectively improve the electrochemical performance of the battery . In this paper, a novel quasi-solid method is used to in-situ synthesize the nano-Pb/C composite as additives in the negative active material of lead-acid cells, which can greatly increase the utilization rate of negative active material and the initial discharge capacity of the lead-acid cell. Compared with the N C material, the nano-Pb/C composite effectively inhibits the hydrogen evolution reaction . In addition, since the nano-Pb/C composite and the negative active material in the negative plate form a porous framework, the diffusion of the electrolyte and the dissolution of PbSO 4 are accelerated. The cell containing 1 wt.% nano-Pb/C composite has the best cycle performance (18,154 cycles) under high-rate partial-state-of-charge condition. All in all, the nano-Pb/C composite prepared via a new quasi-solid method has the advantages of improving the initial capacity and lifespan of lead-acid batteries, and it is a promising candidate material for lead-acid battery additives.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shengming Liu,Wei Hu,Jing Yang,Yun Zhang,Moke Zhou,Shihua Ding
Currently, most of the microwave ceramics have dielectric constant ( ε r ) above 5. Novel materials with ultra low ε r are extremely needed to realize high-speed signal transmission. In this work, LiAl 1- x Ni x SiO 4- x /2 and LiAl 1- y Mg y SiO 4- y /2 ceramics were synthesized via the solid-state method. X-ray diffraction (XRD) analysis revealed that all compositions formed single-phase solid solutions with hexagonal structure. Ni 2+ and Mg 2+ , as heterovalent dopants, induced oxygen vacancies and enhanced the relative density of the samples. The grain size also gave a positive correlation with density. According to the Phillips-Van Vechten-Levine (P-V-L) theory, variations in ε r were influenced by bond ionicity. Notably, the quality factor ( Q×f ) significantly increased from 30,520 GHz to 41,100 GHz (40,300 GHz) with the help of Ni 2+ (Mg 2+ ) doping, primarily attributed to the variations of lattice energy and oxygen vacancies content. Furthermore, the temperature coefficient of resonant frequency ( τ f ) was predominantly governed by the bond energy and linear expansion coefficient. After sintering at 1150 °C, LiAl 0.985 Ni 0.015 SiO 3.9925 and LiAl 0.985 Mg 0.015 SiO 3.9925 ceramics exhibited excellent microwave dielectric properties: ε r =3.94 (3.92), Q×f =41,100 (40,300) GHz, and τ f =-9.45 (-19.44) ppm/°C, respectively. Ultra-low ε ᵣ and near zero τ f were obtained. These results demonstrated promising performance for microwave applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Shuang Liu,Lianyi Shao,Xuejing Zhang,Meng Zhou,Zhanliang Tao,Jun Chen
KTiOPO 4 (KTP) microblocks, which were prepared using a simple solid state method, have been used as novel anode materials for sodium ion batteries (SIBs). The as-prepared KTP microblocks with size distribution of 300–500 nm delivered high performance of electrochemical storage of sodium, such as an initial charge capacity of 108.7 mAh g −1 at 200 mA g −1 with almost no capacity loss in 1000 cycles, and good rate capability of 80.3 mAh g −1 even at the current density of 1000 mA g −1 . Ex situ XPS and in situ XRD showed an irreversible phase reaction mechanism during the insertion/extraction of Na + . Dendrite formation at lower potential could be suppressed at the average potential of 1.3 V. This work indicated that KTP microblocks are low-cost and safe anode materials for SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Wenyao Zhang,Zhonglei Wei,Zhihua Yang,Shilie Pan
By using cation modulation strategy, a series of fluorooxoborates A3B3O3F6 (A = alkali and mixed alkali metal) were designed and successfully obtained via open high-temperature solid-state method for the first time, and single-crystal X-ray diffractions were used to determine their structures. The isolated B3O3F6 benzene-like ring structure in the title compounds is beneficial to obtain short ultraviolet absorption edge (<190 nm), which was confirmed by the UV–vis–NIR diffuse reflectance spectra. Owing to the cation size effect, there are some subtle differences in the alignment of the anionic groups. In addition, theoretical calculations were carried out to understand their electronic structures and optical properties.
研究领域:
材料科学
·
无机化学
·
固体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 11
·8464-8471
·
IF 2.22
Si Shufang,Deng Hongmei,Wang Tiantian,Yang Pingxiong,Chu Junhao
Perovskite compounds Bi 0.7 A 0.3 FeO 3−δ (BAFO) (A = Ca, Sr, Pb, and Ba) with improved optical and magnetic properties have been synthesized by solid-state method. The effect of bivalent ions substitution on the phase transition, microstructure, optical, and magnetic properties are investigated in detail. X-ray diffraction and Raman scattering spectra analyses indicate the phase transition from rhombohedral to cubic in doped samples and the coexistence of the two phases in BBFO, inducing strong lattice distortions. A blue shift observed in d–d transitions energies can reveal the decreased internal chemical pressure, thus leading to the slight increase in bandgaps of BSFO, BPFO, and BBFO. While, narrowed bandgap of 1.96 eV can be found in BCFO for the increased tailing of the conduction band edge into the gap. Besides, room-temperature ferromagnetism has been observed in Sr-, Pb-, and Ba-doped samples which can be resulted from the suppression of spiral structure of BFO. These results lay a solid foundation on further exploring the potential abilities of BFO ceramics as multiferroic photovoltaic materials.
研究领域:
材料科学
·
固体物理
·
光电
·
磁学
✓ 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）