Results in Physics
·
2022
·
IF 4.565
Yige Du,Qilong Gao,Andrea Sanson,Hengli Xie,Yangming Hu,Gaojie Zeng,Juan Guo,Xiao Ren,Erjun Liang
Negative thermal expansion (NTE) is an intriguing physical phenomenon, which is of great significance for the high precision application. In this work, we have realized to broaden the NTE temperature zone in Mg 2 P 2 O 7 -based bulk material by doping Cu atom on the Mg site. A joint study of Raman scattering and X-ray diffraction (XRD) indicates that there are double phases in the NTE temperature zone, and the NTE of Mg 1.9 Cu 0.1 P 2 O 7 bulk material comes from the phase transition of α - and β -phase. The present work provides a way to optimize negative thermal expansion property in phase transition typed materials.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
功能材料
·
热学性能
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2014
·Vol. 32
·期 8
·686-690
·
IF 1.342
LIU Lisha,CHEN Haohong,LIU Biqiu,ZHANG Hui,TANG Bin,FENG Xianjuan,SUN Zhijia,ZHAO Jingtai
To explore novel nano-scintillator with a controllable architecture, pure and Eu 3+ doped lutetium oxyfluoride (Lu 7 O 6 F 9 ) powder were synthesized by combining mild hydrothermal method and solid state calcination approach. The products were all pure orthorhombic Vernier phase demonstrated by X-ray powder diffraction (XRD). The detailed crystal structure was also studied by Reitveld refinement. Lath-like microcrys tals composed of nanoparticles with unique hollow tube of the products were supported by the images of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Excited by X-ray with W as the target, the pure product showed intense broad emission with the peak at about 400 nm suitable for modern photoelectric multiplier tube (PMT), while the Eu 3+ doped sample transferred the incident energy to Eu 3+ ions and gave strong 5 D 0 → 7 F j ( j =0, 1, 2 and 4) emission, which fitted for imaging and labeling measurements. From the luminescent properties, both pure and Eu 3+ -doped products are potential excellent scintillator for X-ray imaging and other high energy detectors, and the pure product is also a good host candidate for rare earth doping.
研究领域:
材料科学
·
无机化学
·
发光材料
·
纳米医学
·
生物成像
·
辐射探测
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Zhiping Zhang,Yuenan Wang,Yang Lei,Fang Zhang,Xiaobing Chen,Hongfei Liu
Negative thermally expanded (NTE) (KMg) x Sc 2-x (WO 4 ) 3 (0 = x ≤ 1.5) ceramics have been prepared via solid-state reaction. X-ray diffraction (XRD) analysis reveals that (KMg) x Sc 2-x (WO 4 ) 3 undergoes a composition-induced phase transition as the (KMg) 3+ -substitution content increases. For x = 0.25, both hexagonal (KMg) x Sc 2-x (WO 4 ) 3 and orthorhombic Sc 2 (WO 4 ) 3 coexisted in the sample. For 0.25 < x ≤ 1, a single-phase, hexagonal (KMg) x Sc 2-x (WO 4 ) 3 , was obtained. When x is further increased to 1.25, monoclinic MgWO 4 impurity was detected in the sample. Meanwhile, as x increases, the grain size of (KMg) x Sc 2-x (WO 4 ) 3 ceramics grows up. Hexagonal (KMg) x Sc 2-x (WO 4 ) 3 ceramics show high densification and strong NTE property. Thermomechanical analysis indicates that the linear coefficients of thermal expansion (CTEs) of hexagonal (KMg) x Sc 2-x (WO 4 ) 3 ceramics decrease from −7.48 × 10 −6 °C −1 to −14.06 × 10 −6 °C −1 with the increase of x. High-temperature XRD analysis reveals that hexagonal (KMg) 0.5 Sc 1.5 (WO 4 ) 3 show an anisotropic NTE. The intrinsic linear CTEs are α a = α b = −6.74 × 10 −6 °C −1 , α c = 11.03 × 10 −6 °C −1 and the volumetric CTE is α v = −2.52 × 10 −6 °C −1 .
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
热学性能
·
结构与物性
✓ 已验证
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2017
·Vol. 214
·期 11
·1700538
·
IF 1.775
Peihua Wangyang,Hui Sun,Xinghua Zhu,Dingyu Yang,Xiuying Gao,Wenyi Liu,Yan Chen,Haibo Tian,Sibo Huanglong
A promising photodetector based on CH 3 NH 3 PbI 3 single crystal under visible light and X-ray irradiation is reported. The CH 3 NH 3 PbI 3 crystal grown by inverse temperature crystallization acts as the absorber material directly converting visible light and the impinging X-ray photons to electron hole pairs, respectively. The underlying photoelectric response mechanism behind the observation under visible light and X-ray irradiation is carefully discussed. Remarkably, the perovskite detectors demonstrate a good air-exposure stability for more than 2 months with encapsulation. The results demonstrate that the CH 3 NH 3 PbI 3 single crystal has a great potential for application in the visible light and X-ray detection.
研究领域:
材料科学
·
凝聚态物理
·
核医学
·
生物医学工程
·
辐射检测
·
半导体器件
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2018
·
IF 2.687
Xue Chen,Ning Li,Yuan Li,Ping Che
In this work the CH 3 NH 3 PbI x Cl 3−x perovskite is obtained by applying vacuum-rotary evaporation procedure with a precursor solution of PbCl 2 and CH 3 NH 3 I in dimethylformamide. Thermal gravimetric and differential thermal analysis (TG-DTA) and the variable temperature powder X-ray diffraction ( in situ XRD) are employed to research the effect of thermal treatment on the decomposition and the crystal structure of perovskite . It is found that tetragonal to cubic phase transition in the typical perovskite disappears in mixed perovskite crystals because the stabilizing action of Cl. The excess Cl in the precursor leads to the intermediate structure CH 3 NH 3 PbCl 3 , and then transforms into CH 3 NH 3 PbI 3 with temperature increasing.
研究领域:
材料科学
·
无机化学
·
固体物理
·
能源材料
·
晶体学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 18
·17440-17446
·
IF 2.195
Wang Tianxiong,Meng Xianquan
We try to synthesize In x Ga 1−x Sb nanowires on silicon (100) substrate using InSb and GaSb as source materials and we succeeded. Au film was used as catalysts. The experiment is simple and repeatable. The diameter of the grown nanowires is 60–200 nm and up to 10 microns in length. The grown nanowires have good crystallinity. Due to the doping of indium, we found that the XRD peaks of nanowires were shifted. We have fabricated fully nanostructured device using ultra-long Ag nanowires as electrodes for the I–V characteristic study, and found that the device has photoresponse characteristics and the I–V characteristic curve was asymmetric, we explain that it was due to the asymmetry of this fully nanostructured devices.
研究领域:
材料科学
·
纳米科技
·
半导体物理
·
固体电子学
·
晶体生长
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2016
·Vol. 28
·期 1
·49-54
·
IF 1.947
Qi-Feng Li,Chao Wang,Xiao-Zheng Lan
Latent heat storage performance of a layered perovskite-type compound, 1-C 14 H 29 NH 3 ) 2 ZnCl 4 (C 14 Zn), embedded in a series of silica gel (SG) with pore sizes of d = 15–200 nm is investigated using differential scanning calorimetry (DSC), and powder X-ray diffractions (XRD). C 14 Zn in the nanopores of silica gel shows size-dependent phase transition temperature, enthalpy change and supercooling. They have a stable transition temperature and heat capacity at each size in a short-term thermal cycling. Similar X-ray diffraction patterns are observed for the nano-sized and the bulk C 14 Zn. The encapsulation of a phase change material in nanopores is a new way of tuning its thermal energy storage properties for a wider range of temperature regulation.
研究领域:
材料科学
·
热力学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 17
·9362-9367
·
IF 3.43
Weifeng Huang,Yingcai Zhu,Yong Liu,Lijuan Liu,Changchun Yang,Wei Xu
The quaternary chalcogenides consisting of earth-abundant elements such as Cu2ZnSnSe4 (CZTSe) have promising electrical and optical properties prompting enormous technological interest. Understanding different types of defects including Cu/Zn ordering is believed to be the key point to tackle technological challenges such as a large open circuit voltage deficit in CZTSe. The Te doped Cu2.2Zn0.8SnSe4−xTex (x = 0.01–0.04) were investigated using X-ray absorption fine structure spectroscopy at the Cu, Zn, and Se K-edges as well as at the Te L3-edge. Cu at the zinc site with anti-site defects and oxygen interstitials are identified. The detailed electronic structure upon Te doping is studied, providing insights into the rich defect chemistry present in this compound.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
半导体材料
·
光电功能材料
✓ 已验证
DOI
高影响因子
POLYMER
·
2017
·
IF 3.684
Wei Yang,Xu Cheng,Haibo Wang,Yuansen Liu,Zongliang Du
Novel waterborne fluorinated polyurethane (WFPU) based on hydroxyl-terminated poly(fluoroalkyl methacrylates) (HTPFMA) was prepared successfully. The microstructures and micro-phase separation of WFPU were evaluated through infrared spectroscopy (FT-IR), X-ray diffraction (XRD), dynamic mechanical analysis (DMA), and scanning electron microscope (SEM). FT-IR revealed that the H-bonded carbonyl in hard domains increased with the increasing of fluorine content, resulting in enhancing the extent of micro-phase separation between hard and soft segments. XRD results indicated that the crystallinity of hard segment was enhanced with the increasing of fluorine content. The direct visual microstructures by SEM showed that the micro-phase separation was more significant when the fluorine content increased. DMA also revealed strengthened micro-phase separation with increasing fluorine content. The studies of mechanical properties confirmed that WFPU based on HTPFMA had outstanding mechanical properties. The effects of fluorine content on the static contact angles, surface free energy , and surface composition were also studied. The static contact angles of the WFPU films against water and methylene iodide reached around 108° and 84°, respectively. X-ray photoelectron spectroscopy (XPS) confirmed that the fluorine surface enrichment factor in the outermost 10 nm depth was about 10–18 fold higher than its bulk level.
研究领域:
高分子材料科学
·
表面科学
·
材料化学
·
软物质物理
·
功能涂层材料
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2023
·Vol. 53
·期 12
·2411-2419
·
IF 2.9
Mai Manfang,Liao Bin,Liao Yijun,Lin Donghai,Ma Xinzhou
GaTe thin films are electrochemically deposited on indium tin oxide for photoelectrochemical applications. The electrochemical deposition behavior of GaTe thin films in acidic solution of HTeO 2 + with Ga 3+ is studied with cyclic voltammetry combining with operando transmittance spectroscopy. Underpotential deposition of Ga on Te starts at potential of − 0.35 V. The presence of Ga 3+ in the solution can strongly suppressed the formation of H 2 Te. XPS analysis reveals that Ga-rich GaTe is deposited over a wide potential range. The photoelectrochemical performance of the thin films as photocathodes is strongly dependent on the deposition potential. The GaTe films deposited at − 1.0 V produced the highest photocurrent of about − 0.03 mA cm −2 . Meanwhile the film deposited at − 0.35 V shows improved performance during photoelectrochemical measurement, which can be ascribed to the increased GaTe content during photoelectrochemical measurements, as confirmed by XPS analysis. Graphical
研究领域:
材料科学
·
电化学
·
半导体物理
·
光电功能材料
·
能源材料
·
表面科学
·
薄膜技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Haojie Zhu,Ke Yang,Hua Lan,Shangshu Qian,Haoxiang Yu,Lei Yan,Nengbing Long,Miao Shui,Jie Shu
In this work, Na 2 Ti 3 O 7 is fabricated as lithium storage material via one-step solid state reaction. Worked as anode material , Na 2 Ti 3 O 7 delivers a stable electrochemical performance with good lithium storage capability. Structural analyses show that Na 2 Ti 3 O 7 anode experiences slight volume change during electrochemical lithiation/delithiation process. Moreover, the reversibility of structural evolution is further demonstrated by in-situ X-ray diffraction technique . All these evidences prove the cycling stability of Na 2 Ti 3 O 7 as lithium storage material. Besides, the kinetic properties of the Li + ion storage in Na 2 Ti 3 O 7 are systematically investigated. The observed results reveal that Na 2 Ti 3 O 7 delivers the lithium ions diffusion coefficient in the range of 10 − 14 –10 − 12 cm 2 s − 1 during the discharge process and 10 − 15 –10 − 12 cm 2 s − 1 during the recharge process. It suggests that Na 2 Ti 3 O 7 has good lithiation/delithiation kinetics in rechargeable batteries.
研究领域:
电化学
·
材料科学
·
能源存储
·
无机化学
·
固体化学
✓ 已验证
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2024
·Vol. 50
·期 3
·e202400232
·
IF 1.7
Bo Hao,Caixian Xu,Geng Chen,Yuangen Lu,Li Zhang
In response to issues such as poor accuracy and unstable delay times encountered in the practical use of tungsten-based delay compositions, an analysis of the combustion performance of tungsten-based delay compositions with the addition of copper oxide was conducted. This study selected five tungsten-based composite delay compositions prepared by blending tungsten-based delay compositions with copper oxide at different content, aiming to investigate the influence of varying copper oxide proportions on the combustion characteristics of tungsten-based delay compositions. Microscopic morphologies and thermal decomposition behaviors of the tungsten/copper oxide delay compositions were analyzed using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), while combustion products were examined by X-ray diffraction (XRD). The results indicate that copper oxide exerts a strong catalytic decomposition effect on tungsten-based delay compositions. Specifically, a low concentration of copper oxide enhances the combustion rate of tungsten-based delay compositions, while an increase in copper oxide content subsequently slows down the combustion rate. Notably, tungsten-based delay compositions with 9% copper oxide content demonstrate high precision, good stability, and a relatively slow combustion rate, offering a wider range of adjustability for controlling the combustion speed of delay compositions and providing a feasible method for managing the delay time range in practical applications.
研究领域:
材料科学
·
火工品技术
·
燃烧学
·
无机化学
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）