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| 1 | Chelating agents role on phase formation and surface morphology of single orthorhombic YMn_2O_5 nanorods via modified polyacrylamide gel route显示文摘YMn2O5nanorods were synthesized through a modified polyacrylamide gel route.The synthesis strategy in this work is based on a sol-gel process using a polyacrylamide gel method in which oxalic acid,citric acid or tartaric acid is employed as the chelating agent.In the gel routes,oxalic acid was used as a carboxyl chelating agent,while citric acid or tartaric acid was a carboxyl and hydroxyl chelating agent.The as-prepared samples were characterized by means of techniques such as X-ray powder diffraction(XRD)measurement,thermogravimetric analysis(TG),differential scanning calorimetry analysis(DSC),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),thermal expansion measurement and field-emission scanning electron microscopy(SEM)investigations.It was found that oxalic acid is the best chelating agent with Y(NO3)3·6H2O and Mn(CH3COO)2·4H2O as precursors to prepare a single orthorhombic YMn2O5nanorods at 1000°C.Scanning electron microscope observation shows that the morphology of YMn2O5powders is significantly dependent on the chelating agent.The peaks(single orthorhombic YMn2O5nanorods)at 642,600,573,546,521,493,486,468,448 and 400cm?1were observed from FTIR spectra.The phase,surface morphology and chelation mechanisms of YMn2O5samples have been discussed on the basis of the experimental results. | WANG ShiFa ZHANG ChuanFei SUN GuangAi CHEN Bo XIANG Xia DING QingPing ZU XiaoTao | 2014 | Science China Chemistry2014，57，3： | 4 |
| 2 | Optimization of tungsten carbide opposite anvils used in tile in situ high-pressure loading apparatus显示文摘 | Zhang Ying Chen Xiping Sun Guangai | 2014 | Mathematical Problems in Engineering2014，2014，60： | 1 |
| 3 | Synthesis and study the thermal properties of hexagonal ZrW~O~显示文摘 | Fang Leiming Chen Xiping Sun Guangai | 2013 | High Pressure Research2013，33，： | 1 |
| 4 | Neutron diffiaction study of strain/stress states in a creep deformed single crystal superalloy显示文摘 | Wu Erdong Sun Guangai Chen Bo | 2014 | MetaLlurgical and A<erials'' Transactions' A2014，45，： | 1 |
| 5 | Tensile deformation behaviors of Zircaloy-4 alloy at ambient and elevated temperatures: in situ neutron diffraction and simulation study显示文摘 | Li Hongjia Sun Guangai Woo Wanchuck | 2014 | Journal of Nuclear Materials2014，446，： | 1 |
| 6 | Formation and evolution of He bubbles in He-containing Ti fihns studied by small-angle X-ray scattering and transmission electron microscopy显示文摘 | Sun Guangai Wu Erdong Huang Chaoqiang | 2014 | Thin Solid Fihns2014，，： | 1 |
| 7 | Thermally induced damage in hexanitrohexaazaisowurtzitane显示文摘 | Tian Qiang Yan Guanyun Sun Guangai | 2013 | Central European Journal of Energetic Materials2013，10，： | 1 |
| 8 | Thermally induced damage in Hexanitro-hexaazaisowurtzitane显示文摘 | Tian Qiang Yan Guanyun Sun GuangAi | 2013 | Central European Journal of Energetic Materials2013，10，3： | 1 |
| 9 | Fatigue Damage Mechanism of AL6XN Austenitic Stainless Steel at High Temperatures显示文摘By the combination of transmission electron microscope, neutron diffraction and small-angle neutron scattering methods, mechanical fatigue behavior of AL6XN austenitic stainless steel was investigated in the temperature range of 400–600 °C. At 400 °C, in addition to the occurrence of dynamic strain aging, the formation of short-range order was evidenced from the forbidden electron diffraction spot of 1/3 {422} in face-centered cubic(fcc) structure viewed down [111] zone axis, which facilitate the planar slip mode of dislocation and result in the work hardening during the fatigue deformation. The fatigue damage is mainly dominated by the accumulation of planar slip band and the interaction among various slip systems. With increasing temperature, precipitates of chi phase, Laves phase and sigma phase were formed during the fatigue tests at 500 and 600 °C. An increase in precipitation content at 600 °C has also been confirmed by both scanning electron microscope and small-angle neutron scattering analysis. The dislocation pileup originating from the uncoordinated deformation between precipitate and austenitic matrix is an important fatigue damage leading to crack. The continuous cycle softening behavior was also observed on the fatigue curve at 600 °C, which is considered to be caused by dynamic recovery. | Yanyan Hong Penglin Gao Hongjia Li Changsheng Zhang Guangai Sun | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，6： | 0 |
| 10 | A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption显示文摘The barium ferrite BaTi_(x)Fe_(12−x)O_(19)(x=0.2,0.4,0.6,0.8)(BFTO-x)ceramics doped by Ti4+were synthesized by a modified sol–gel method.The crystal structure and magnetic structure of the samples were determined by neutron diffraction,and confirm that the BFTO-x ceramics were high quality single phase with sheet microstructure.With x increasing from 0.2 to 0.8,the saturation magnetization(M_(s))decreases gradually but the change trend of coercivity(H_(c))is complex under the synergy of the changed grain size and the magnetic crystal anisotropy field.Relying on the high valence of Ti^(4+),double resonance peaks are obtained in the curves of the imaginary part of magnetic conductivity(μ′′)and the resonance peaks could move toward the low frequency with the increase of x,which facilitate the samples perform an excellent wideband modulation microwave absorption property.In the x=0.2 sample,the maximum reflection loss(RL)can reach−44.9 dB at the thickness of only 1.8 mm,and the bandwidth could reach 5.28 GHz at 2 mm when RL is less than−10 dB.All the BFTO-x ceramics show excellent frequency modulation ability varying from 18(x=0.8)to 4 GHz(x=0.4),which covers 81%of the investigated frequency in microwave absorption field.This work not only implements the tunable of electromagnetic parameters but also broadens the application of high-performance microwave absorption devices. | Jun LI Yang HONG San HE Weike LI Han BAI Yuanhua XIA Guangai SUN Zhongxiang ZHOU | 2022 | Journal of Advanced Ceramics2022，11，2： | 0 |
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