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- 저자 : Lixi Wang (검색결과 4 건)
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Zhefei Wang,Jiajia Wu,Lixi Wang,Zhenxiao Fu,Qitu Zhang 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.6
Ba(Co1/3Nb2/3)O3 (BCN) ceramics were prepared using a conventional solid-state route. Effects of sintering on microstructure and microwave dielectric properties of Ba(Co1/3Nb2/3)O3 ceramics were systematically investigated. Appropriate sintering temperature could restrain the evaporation of CoO and the formation of Nb-rich phase. The dielectric constants and temperature coefficients of resonant frequency changed slightly with the variation in sintering temperatures. The high Q× f value with prolonged sintering time was related to the improvement of 1 : 2 ordered arrangement in the B site, rather than the compactness of ceramics. Excellent microwave dielectric properties (εr=32.6, Q×f =86857 GHz, τf=−14 ppm/°C) were obtained in the Ba(Co1/3Nb2/3)O3 ceramics sintered at 1380°C for 12 h.
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Tianpeng Yu,Lixi Wang,Xiaojuan Yang,Wenhao Ding,Qitu Zhang 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.1
In this paper, green-blue emitting Sr 2 SiO 4 (SSO):0.03Tb 3+ , x Ce 3+ ( x = 0–0.005) materials were synthesized via a solid-statereaction method. The crystal structures, luminescence properties, decay time, and thermal stability were measured in thiswork. The as-prepared phosphors exhibit both an indigo emission of Ce 3+ and green emission of Tb 3+ with considerableintensity ( λ ex = 300 nm). Tb 3+ ion emission was intensifi ed obviously with co-doping Ce 3+ . The luminescence spectra ofSr 2 SiO 4 (SSO):0.03Tb 3+ , Ce 3+ shows characteristic line of Tb 3+ ion transition ( 5 D 4 → 7 F 5 ). Tunable green-blue color canbe obtained by the addition of Ce 3+ ions. An eff ective energy transfer process between Tb 3+ and Ce 3+ was supposed andconfi rmed from decay curves. In addition, the energy transfer mechanism from Ce 3+ to Tb 3+ ions in the Sr 2 SiO 4 (SSO) hostis electric multipolar interaction. Sr 2 SiO 4 (SSO):Tb 3+ , Ce 3+ phosphor exhibits good thermal stability, the quantum yield wasabout 43.67%, indicating a potential candidate for solid-state lighting.
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Microwave Dielectric Properties of High-Q Mg(SnxTi1-x)O3 Ceramics
Zhijie Gong,Zhefei Wang,Lixi Wang,Zhenxiao Fu,Wei Han,Qitu Zhang,김응수 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.3
A series of Sn-doped Mg(SnxTi1-x)O3 ceramics were prepared using the conventional solid-state route. The influence of Sn4+ substitution for Ti4+ on the microstructure and microwave dielectric properties of Mg(SnxTi1-x)O3ceramics was systematically investigated. Substitution with a suitable amount of Sn can eliminate the MgTi2O5phase. The dielectric constants and temperature coefficients of resonant frequency changed slightly with the variation in Sn content in the specimens. However, the quality factors (Q) dramatically improved and were sensitive to the concentration of Sn4+. The high Q value was attributed to the uniform grain, clean and narrow grain boundary, and elimination of the MgTi2O5 phase. Moreover, the composition-optimized Mg(Sn0.05Ti0.95)O3ceramics sintered at 1390°C exhibited excellent microwave dielectric properties of εr = 17.61, Q×f = 328,543GHz, and τf = −42 ppm/°C.
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Antony Maodzeka,Qian Wang,Xiaoyang Chen,Nazim Hussain,Dezhi Wu,Lixi Jiang 한국식물학회 2019 Journal of Plant Biology Vol.62 No.3
Application of 5-Aminolevulinic acid (ALA) toplants not only affects their growth, but also influences thenutritional values of plant organs. Oilseed rape (Brassicanapus L.) is an important source of vegetable oil and variouscompounds benefiting human health. However, limitedinformation is available regarding the effect of ALA on thegrowth of this important crop. Here, we investigated theconsequence of ALA application on oilseed rape seedlings. We found that moderate ALA concentrations (0.5 or 1 mg/L)caused an increase in the dry weight of the seedling biomassand the contents of various bioactive compounds, i.e. solublesugar, phenolic compounds, ascorbate, and glucosinolatesetc, and the upregulated expressional levels of the genesencoding RuBisCO, namely, BnRBCL and BnRBCS, andother genes such as BnUGT79B1, BnMYB12 and MYB28that regulate the synthesis of phenolic compounds andglucosinolates respectively. On the other hand, high ALAconcentrations (5 and 10 mg/L) gave rise to oxidative stressthat negatively affected oilseed rape growth, and causeddeleterious effects by reducing various bioactive compounds,but increasing tocopherols that may serve as a stress mitigatoryagent. With the high ALA concentrations, the ultrastructureof chloroplasts was notably damaged, featured with largestarch grains and fewer plastoglobules.
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