JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wanying Wu,Mengmeng Lun,Zhifeng Xing,Hanzhao Song,Aihua Yao,Xunsheng Zhou,Zhong Wan,Kun-ming Gu,Sheng Yu,Qiliang Li,Yinzhen Wang,Wei Li,Guannan He,Benli Chu,Qinyu He
Te doped Yttrium-aluminum (Y 2 O 3 –Al 2 O 3 ) system powders were synthesized by solid-state method. The structure and optical properties were investigated by XRD , SEM, XPS and PL. XRD analysis indicated that the samples transform from YAM, YAP to YAG phase as the sintering temperature rises. The samples sintered below 1200 °C have a broad emission centered at 604 nm with a lifetime up to 13.33 μs under room temperature. While in the mix phase of YAP and YAG, a sharp and intense emission peak centered at 715 nm was monitored with a lifetime up to approximate 2.76 ms. Moreover, the band structure and density of states for Te doped YAGwere investigated by first-principle calculations.
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 Energetic Materials
·
2017
·
IF 1.557
Xi Li,Qiu-han Lin,Xin-Ying Zhao,Zhi-Wei Han,Bo-liang Wang
Thermal techniques (differential scanning calorimetry (DSC) and the vacuum stability test (VST)), according to STANAG 4147, and non-thermal techniques (Fourier transform infrared (FTIR) spectrometry and X-ray diffractometry (XRD)) were used to examine compatibility issues for 2,4,6,8,10,12-hexanitrohexaazaisowurtzitane (CL-20) with a selection of insensitive explosives, including nitroguanidine (NQ), 2,4,6-trinitrotoluene (TNT), 2,6-diamino-3,5-dinitropyridine-1-oxide (ANPyO), 2,4,6-triamino-1,3,5-trinitrobenzene (TATB), 3-nitro-1,2,4-triazol-5-one (NTO) and 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105). DSC measurements showed that ANPyO, TATB, NTO and LLM-105 were compatible with CL-20. The compatibility of CL-20/NQ, CL-20/TNT, CL-20/ANPyO, CL-20/TATB, CL-20/NTO and CL-20/LLM-105 mixtures was further explored using the VST, which revealed that all the selected insensitive explosives were compatible with CL-20. Possible chemical interactions were suspected for CL-20/TATB from the FTIR results and for CL-20/NTO from XRD analysis. In summary, ANPyO and LLM-105 demonstrated the optimal compatibility with CL-20.
研究领域:
材料科学
·
化学工程
·
爆炸物研究
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2016
·
IF 2.437
Xinyu Peng,Yixin Zhang,Ying Chen,Sai Li,Bin He
A well-defined miktoarm star copolymer (μ-PEG-PCL-PLLA) was synthesized and the crystallization behavior of the copolymers was investigated. The structure of copolymer was confirmed by 1 H NMR, the molecular weight and molecular weight distribution were studied by GPC . XRD and POM were used to study the crystallization behavior of the miktoarm star copolymers. The XRD spectra showed that the miktoarm star copolymer showed low crystallinity for the joint of terminal, which limited the mobility of polymeric chains. The POM photographs revealed that PCL segments formed spherulites with PLLA crystalline grains as nucleus due to the good compatibility between PCL and PLLA.
研究领域:
材料科学
·
高分子化学
·
生物医学材料
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Yinhai Pan,Du Wei,Shuo Yao,Haijun Zhang,Quanzhi Tian
Coal gasification slag (CGS) is rich in Li and Ga. However, few studies have focused on the extraction of Li and Ga from CGS. In the present study, the leaching of Li and Ga from CGS calcined with the alkali reagents including NaOH, KOH, Na 2 O 2 , Na 2 CO 3 and K 2 CO 3 were studied through water leaching and solid characterizations including XRD, TG-DSC and NMR. The best leaching percentages of Li and Ga from NaOH-, KOH-, Na 2 O 2 -, Na 2 CO 3 - and K 2 CO 3 -roasted products were 40.81% and 47.89%, 41.19% and 31.60%, 28.04% and 52.40%, 28.21% and 48.58%, and 34.29% and 38.61%, respectively, showing Li and Ga are difficult to be leached out. It has been proven that the formation of insoluble crystal substances (such as NaAlSiO 4 ) in alkali fusion products inhibits the leaching of Li and Ga. In addition, Li and Ga can be released from the insoluble crystal substances due to Na 2 SiO 3 in alkali fusion products can promote the dissolution of insoluble crystal substances into SiO 4 and AlO 4 species, which can improve the leaching of Li and Ga. However, part of the released Li and Ga are stabled in the structure of amorphous substances generated by SiO 4 and AlO 4 species in the form of isomorphism, reducing the leaching of Li and Ga. Thus, this work would provide guidance for the leaching of Li and Ga from CGS.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2024
·
IF 4.7
Xiao-qing LU,Ai-min LIU,Feng-guo LIU,Xian-wei HU,Zhong-ning SHI
The feasibility and reaction mechanism of NdFeB film electrodeposition in 1,3-dimethyl-2-imidazolidinone (DMI)−LiNO 3 ionic liquid analogs at room temperature were investigated. Cyclic voltammetry indicated that the reduction peak at −1.83 V (vs Ag) was related to the reduction of Fe(II) to Fe, while the reduction peak at −2.01 V (vs Ag) was related to the reduction of B(III) to B. The electrochemical reduction reaction of Fe(II) and B(III) were irreversible processes controlled by diffusion, and the diffusion coefficients of Fe(II) and B(III) at 313 K were 3.03×10 −6 and 6.74×10 −7 cm 2 /s, respectively. In addition, XRD analysis suggested that the product obtained by the electrodeposition in DMI−LiNO 3 −Nd(CF 3 SO 3 ) 3 −FeCl 2 −H 3 BO 3 ionic liquid analogs for 2 h on the Al substrate contained NdFe 3 B 3 . SEM and EDS analysis showed that Nd, Fe, and B in the cathode product were uniformly distributed. XPS analysis revealed that the mass fractions of Nd, Fe, and B on the W substrate were 27.44%, 27.90%, and 7.51%, respectively.
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 NUCLEAR MATERIALS
·
2018
·
IF 2.447
Xin Wang,Min Xue,Songbai Liu,Kuo Jiang
In this paper, (Gd 1− x Ce x ) 2 Zr 2 O 7+ x immobilized matrices with high cerium (Ce) amount-of-substance fractions (up to 90%) were prepared by sol-spray pyrolysis , and then sintered at 1600 °C in air. XRD results showed that all samples were in a mixture of pyrochlore and fluorite phase, even after sintering at 1600 °C. All the sintered bulks were dense, and the densities were independent of the additive content . The SEM results showed that all samples were chemically homogeneous. There was no segregation in the grain boundary. EDS quantification yielded a mean composition close to the stoichiometric chemical composition.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2020
·
IF 2.187
Tongpeng Zhao,Shaohua Ji,Degao Zhong,Fei Teng,Shakir Ullah,Siyuan Hu,Jie Tang,Bing Teng
The organic nonlinear optical (NLO) material N, N-dimethyl-4-[2-(2-quinolyl) vinyl] aniline (DADMQ) has been synthesized and high-quality single crystal with the dimension of 8 × 1 × 0.5 mm 3 was grown from methanol solvent by slow cooling method for the first time. Single crystal and powder XRD studies show that DADMQ crystal belongs to the orthorhombic space group Pna2 1 . All the functional groups and structure of the synthetic material can be determined from FT-IR and 1 H NMR spectral analyses. The thermal properties can be studied through TG/DTG and DSC analyses, and its melting point is confirmed at 184.9 ℃. Some critical optical characteristics like the optical transmittance, optical absorption coefficient (α), energy band gap ( E g ), cut-off wavelength (λ max ) and extinction coefficient (κ) can be carried out through UV–vis-NIR spectral analysis. The dielectric features of the title crystal have also been measured. Furthermore, there is a blue emission appeared at 493 nm through PL spectral analysis. The second harmonic generation (SHG) efficiency of the title crystal has been measured, which indicates that DADMQ has 3.64 times greater than KDP crystal.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of the Australian Ceramic Society
·
2019
·Vol. 56
·期 3
·895-903
·
IF 0.692
Ma Jing-Yi,Zhang Yi-Bing,Wang Jun-Xia,Song Yu-Yang,Zhou Tong,Wang Yan,Wang Hao-Yu,Wang Jin
In the present paper, the ordered Nd 2 Zr 2 O 7 pyrochlore was primarily synthesized by flux method and the MgO-Nd 2 Zr 2 O 7 composite ceramics were fabricated subsequently through a conventional sintering route. A suite of characterization techniques, including XRD, Raman and BSE-EDS were employed to investigate the phase composition and microstructure of the as-prepared Nd 2 Zr 2 O 7 and MgO-Nd 2 Zr 2 O 7 samples. The acid solubility of the MgO-Nd 2 Zr 2 O 7 composite ceramics was also tested. XRD results showed that the ordered Nd 2 Zr 2 O 7 pyrochlore can be synthesized when the calcination temperature is in the range of 850–1200 °C. Raman results suggested that the chemical bonds of Nd 2 Zr 2 O 7 pyrochlore get stronger, and more ordered structure can be gradually formed with the increase of calcining temperature. For the MgO-Nd 2 Zr 2 O 7 composite ceramics, XRD results also showed that the Nd 2 Zr 2 O 7 phase in the composite ceramics presents higher crystallinity degree and no other phase is formed after sintering at 1400–1550 °C. Moreover, BSE-EDS results indicated that the MgO-Nd 2 Zr 2 O 7 composite ceramics are compact and dense, and the MgO and Nd 2 Zr 2 O 7 phases are almost uniformly distributed between each other. In addition, the relative density of the bulk ceramics was about 96–98%, and it was concluded that ≥ 1500 °C could be the suitable sintering temperature to produce MgO-Nd 2 Zr 2 O 7 composite ceramics. At last, the dissolution behavior of the ceramics in nitric acid solution revealed that only MgO in the MgO-Nd 2 Zr 2 O 7 composite ceramics can be dissolved in the 11 M HNO 3 solution within 24 h, and the dissolution rate was relatively low because of the high densification of the sample.
研究领域:
材料科学
·
核能工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 2
·D65
·
IF 3.12
Min Li,Ying Li,Zhaowen Wang
The electrochemical reduction of zirconium oxide in a molten salt of 2.4NaF·AlF3 (molar ratio = 2.4) was studied at 1273 K. Cyclic voltammetry results show that Zr(IV) ions are first reduced to an intermediate valence and, then, are co-deposited with aluminum to form an Al-Zr alloy. Potentiostatic electrolysis experiments were carried out at different potentials (−0.95 and −1.25 V) and at 1273 K, and the electrolysis products were characterized using SEM-EDS and XRD. The XRD analysis confirms that a mixture of cryolite molten salt and ZrO2 was electrodeposited at −0.95 V, while aluminum and Al3Zr were electrodeposited at −1.25 V. The SEM analysis shows that the aluminum and Al3Zr were in two different phases.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2015
·Vol. 141
·期 1
·256-260
·
IF 4.107
Qiang-Qiang Sun,Min Wang,Shu-Juan Bao,Yu Chen Wang,Shuang Gu
The nanorods of cobalt phosphide have been prepared and evaluated as an electrocatalyst for non-enzyme glucose detection. The nanorods were used to modify the surface of an electrode and detect glucose without the help of an enzyme for the first time. The crystal structure and composition of cobalt phosphide were identified by XRD and XPS, respectively, and the morphology of the as-prepared samples was observed by FESEM and TEM. The electrochemical measurement results indicate that the CoP-based sensor exhibits excellent catalytic activity and a far lower detection potential compared to bare GCE. Specifically, the electrocatalytic mechanism of CoP in the detection of glucose was proposed based on a series of physical characterization methods, electrochemical measurements, and theoretical calculations.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 11
·1-7
·
IF 2.7
Yin Qianliu,Zhang Fanfan,Teng Yanlin,Peng Cong,Wang Chaonan,Jin Yonglong,Xu Meifeng,Xu Tian
Different concentrations of NH 4 Cl are introduced to MAPbI 3 precursor solution, planar MAPbI 3 perovskite films, and solar cells’ performance with or without NH 4 Cl have been studied. The NH 4 Cl/MAPbI 3 films exhibit increased grain size and narrowed grain boundaries. The light absorption of perovskite films with different concentrations of NH 4 Cl was also evaluated. To understand the growth of perovskite films with NH 4 Cl added to perovskite precursor solutions, XRD and XPS spectroscopy were conducted on different perovskite film samples. By adding NH 4 Cl, the MAPbI 3 film shows good crystal quality and the shift of Pb peaks indicates that NH 4 Cl is not physically mixed but chemically incorporated into MAPbI 3 films. We attribute the effect to Cl ions of NH 4 Cl combining with free lead ions of MAPbI 3 so as to fill the vacancy of volatile I ions in the NH 4 Cl–MAPbI 3 films. The 20 mg NH 4 Cl-based device showed an enhanced performance of a PCE of 13.67% compared to the device without adding NH 4 Cl with a PCE of 10.24%. The introduction of 20 mg NH 4 Cl achieved the best passivation effect. Using a 20 mg NH 4 Cl device, the trap density can be reduced to 0.84 × 10 16 cm −3 , resulting in more efficient charge removal from the surface and improved performance.
研究领域:
材料科学
·
太阳能
·
化学
✓ 已验证
DOI
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
·
2013
·
IF 1.564
Zhaoxia Han,Dawei Zhang,Daohua Zhang,Ruijin Hong,Qinmiao Chen,Chunxian Tao,Yuanshen Huang,Zhengji Ni,Songlin Zhuang
Highly dispersed and near stoichiometric chalcopyrite CuInSe 2 nanoparticles were successfully synthesized via a facile and rapid one-pot method. For understanding the reaction pathway, the solid intermediates obtained at different stages of CuInSe 2 nanoparticles synthesis process were investigated in detail by powder X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS), energy dispersive spectroscopy (EDS) and Raman spectroscopy . The XRD patterns showed that the phase formation sequence was CuSe → CuInSe 2 . The XPS results indicated that the valences of Cu and Se in CuSe were +1 and −1, respectively. The chemical composition of the solid intermediates revealed the presence of the solid-state In–Se secondary phases in the synthesis process. However, no XRD signals or Raman signals of the solid-state In–Se secondary phase were observed. Based on the experimental results, the possible reaction pathway was proposed.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）