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- W2377886785 abstract "NaO-BaO-SrO-Nb2O5-B2O3-SiO2 glass-ceramics were prepared using melting method.The effects of different Na2O contents on the phase compositions,microstructure,dielectric properties,volume resistivity and breakdown strength were investigated by differential scanning calorimetry(DSC),X-ray diffractometry(XRD),scanning electric microscopy(SEM) and electrical property measurements.The results show that with increasing Na2O content,the glass transition temperature(Tg) and the first crystallization peak temperature(Tp1) gradually decrease,but the second crystallization peak temperature(Tp2) firstly decreases and then increases and finally decreases.Under the same heat treatment condition((800 ℃,3 h)+(900 ℃,3 h)),the single phase tetragonal tungsten bronze Ba0.5Sr0.5Nb2O6 occurs in the sample without Na2O.The pure phase,Ba0.25Sr0.75Nb2O6,is obtained when Na2O content(mole fraction) is 5%.As Na2O content(mole fraction) is 10%,the main crystalline phase is still Ba0.25Sr0.75Nb2O6,however,the phases of NaSr1.2Ba0.8Nb5O15 and Na2Ba2SiO6 appear.For the sample with 15%Na2O,the types of the crystalline phases are unchanged,but the intensity of the diffraction peak slightly increases.With increasing Na2O content,the dielectric constant of glass-ceramics changes like a N letter,while the breakdown strength and volume resistivity decrease.The sample without Na2O has the highest breakdown strength(1 500 kV/cm),and its energy storage density is 3 J/cm3." @default.
- W2377886785 created "2016-06-24" @default.
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- W2377886785 date "2011-01-01" @default.
- W2377886785 modified "2023-09-23" @default.
- W2377886785 title "Effects of Na_2O content on microstructure and properties of NaO-BaO-SrO-Nb_2O_5-B_2O_3-SiO_2 system glass-ceramics" @default.
- W2377886785 hasPublicationYear "2011" @default.
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