杂化非本征铁电体Ca_3Ti_2O_7陶瓷的溶胶-凝胶法制备
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摘要
采用溶胶-凝胶反应法合成Ca_3Ti_2O_7陶瓷,并系统地研究了制备过程中烧结温度、烧结时间和干凝胶预处理温度等工艺参数对陶瓷物相的影响。X射线衍射测试结果显示,Ca_3Ti_2O_7陶瓷的干凝胶转变温度不会明显影响合成陶瓷的物相纯度;烧结温度和烧结时间是合成陶瓷物相的决定性因素,当烧结温度范围介于1 420～1 440℃之间,烧结时长为30～40 h时,能得到纯度最佳的Ca_3Ti_2O_7陶瓷。
Ca_3Ti_2O_7 ceramics were prepared via the sol-gel method. Through X-ray diffraction of Ca_3Ti_2O_7 ceramic,it is found that the xerogel-turning temperature was not a determining factor for the synthesis of pure phase of Ca_3Ti_2O_7,while calcination temperature and calcination time are determining factors for the synthesis of pure phase.When the calcination temperature is 1420-1440 ℃ and calcination time is 30-40 h,pure phase Ca_3Ti_2O_7 can be obtained.
Ca_3Ti_2O_7 ceramics were prepared via the sol-gel method. Through X-ray diffraction of Ca_3Ti_2O_7 ceramic,it is found that the xerogel-turning temperature was not a determining factor for the synthesis of pure phase of Ca_3Ti_2O_7,while calcination temperature and calcination time are determining factors for the synthesis of pure phase.When the calcination temperature is 1420-1440 ℃ and calcination time is 30-40 h,pure phase Ca_3Ti_2O_7 can be obtained.
引文
[1]Liu X Q,Wu J W,Shi X X,et al.Hybrid improper ferroelectricity in Ruddlesden-Popper Ca3(Ti,Mn)2O7ceramics[J].Applied Physics Letters,2015,106(20):202903.
[2]Harris A B.Symmetry analysis for the RuddlesdenPopper systems Ca3Mn2O7 and Ca3Ti2O7s[J].Physical Review B,2011,84(8):064116.
[3]Benedek N A,Fennie C J.Hybrid Improper Ferroelectricity:A Mechanism for controllable polarizationmagnetization coupling[J].Physical Review Letters,2011,106(10):107204.
[4]Cherian J G,Birol T,Harms N C,et al.Optical Spectroscopy and band gap analysis of Hybrid Improper Ferroelectric Ca3Ti2O7[J].Applied Physics Letters,2016,108(26):136.
[5]Hassanien A S,Akl A A,Sáaedi A H.Synthesis,crystallography,microstructure,crystal defects,and morphology of BixZn1-xO nanoparticles prepared by sol-gel technique[J].Crystengcomm,2018,20(12):1716-1730.
[6]Oh Y S,Luo X,Huang F T,et al.Experimental demonstration of hybrid improper ferroelectricity and presence of abundant charged walls in(Ca,Sr)3Ti2O7 crystals[J].Nature Materials,2014,14(4):407-413.
[7]Li X,Yang L,Li C,et al.Ultra-low coercive field of improper ferroelectric Ca3Ti2O7 epitaxial thin films[J].Applied Physics Letters,2017,110(4):042901.
[2]Harris A B.Symmetry analysis for the RuddlesdenPopper systems Ca3Mn2O7 and Ca3Ti2O7s[J].Physical Review B,2011,84(8):064116.
[3]Benedek N A,Fennie C J.Hybrid Improper Ferroelectricity:A Mechanism for controllable polarizationmagnetization coupling[J].Physical Review Letters,2011,106(10):107204.
[4]Cherian J G,Birol T,Harms N C,et al.Optical Spectroscopy and band gap analysis of Hybrid Improper Ferroelectric Ca3Ti2O7[J].Applied Physics Letters,2016,108(26):136.
[5]Hassanien A S,Akl A A,Sáaedi A H.Synthesis,crystallography,microstructure,crystal defects,and morphology of BixZn1-xO nanoparticles prepared by sol-gel technique[J].Crystengcomm,2018,20(12):1716-1730.
[6]Oh Y S,Luo X,Huang F T,et al.Experimental demonstration of hybrid improper ferroelectricity and presence of abundant charged walls in(Ca,Sr)3Ti2O7 crystals[J].Nature Materials,2014,14(4):407-413.
[7]Li X,Yang L,Li C,et al.Ultra-low coercive field of improper ferroelectric Ca3Ti2O7 epitaxial thin films[J].Applied Physics Letters,2017,110(4):042901.