(Ba_(1-x)Pr_x)Ti_(1-x/4)O_3陶瓷固溶度及位占据的研究
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摘要
采用固相反应法制备了(Ba_(1-x)Pr)x)Ti_(1-x/4)O_3(x=0.10～0.20)(BPT)的陶瓷.由X射线衍射(XRD)和电子顺磁共振(EPR)技术研究了BPT陶瓷的固溶度及Pr离子的位占据情况.结果表明:BPT陶瓷的固溶度为x=0.17,且在固溶限制范围内BPT具有单相立方钙钛矿结构; Pr离子支配性地占据Ba位.
The solid-state reaction method was used to prepare(Ba_(1-x)Pr_x) Ti_(1-x/4)O_3( x = 0.10～0.20)( BPT) ceramics.The solid solubility and site occupations of Pr ions in BPT were investigated using X-ray diffraction( XRD) and electron paramagnetic resonance( EPR) techniques.The results indicate that the solubility limit is x = 0.17,within which BPT ceramics exhibit a single-phase cubic perovskite structure. Pr ions are substituted predominantly for Ba-sites.
The solid-state reaction method was used to prepare(Ba_(1-x)Pr_x) Ti_(1-x/4)O_3( x = 0.10～0.20)( BPT) ceramics.The solid solubility and site occupations of Pr ions in BPT were investigated using X-ray diffraction( XRD) and electron paramagnetic resonance( EPR) techniques.The results indicate that the solubility limit is x = 0.17,within which BPT ceramics exhibit a single-phase cubic perovskite structure. Pr ions are substituted predominantly for Ba-sites.
引文
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[4] F.D.Morrison,D. C. Sinclair,A. R. West. Electrical and structural characteristics of lanthanum-doped bariumtitanate ceramics[J]. J. App. Phys.,1999,86(11):6355-6366.
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[6] D.Makovec,Z. Samardzija,D. Kolar. Solid solubility of cerium in BaTiO3[J].J.Solid State Chem.,1996,123(1):30-38.
[7] Chen A.,Zhi Y.,Zhi J.,et al.Synthesis and characterization of Ba(Ti1-xCex)O3ceramics[J]. Eur. Ceram.Soc.,1997,17(10):1217-1221.
[8] D.Lu,D. Han. In-situ diffuse phase transition at the Curie point of BaTiO3 induced by amphoteric Ce3+/Ce4+ions[J].Ceram.Int.2013,39(8):9727-9730.
[9] A.S.Shaikh,R.W.Vest.Defect structure and dielectric properties Nd2O3-modified BaTiO3[J]. J. Am. Ceram.Soc.,1986,69(9):689-694.
[10] Z. Yao,H. Liu,Y. Liu,et al. Structure and dielectric properties of Nd-doped BaTiO3 perovskites[J]. Mater.Chem.Phys.,2008(109):475-481.
[11] D.Lu,D.Guan,H.Li.Multiplicity of photoluminescence in Raman spectroscopy and defect chemistry of(Ba1-xRx)(Ti1-xHox)O3(R=La,Pr,Nd,Sm)dielectric ceramics[J].Ceram.Int.2018,44(2):1483-1492.
[12] D. Lu,X. Sun,B. Liu,et al. Structural and dielectric properties,electron paramagnetic resonance,and defect chemistry of Pr-doped Ba Ti O3ceramics[J]. J. Alloy.Compd.2014(615):25-34.
[13] R. D. Shannon. Revised effective ionic radii and systematic studies of interatomic distances in halides andchalcogenides[J]. Acta Cryst. A,1976(32):751-767.
[14] T.Kolodiazhnyi,A. Petric. Analysis of point defects in polycrystalline BaTiO3 by electron paramagnetic resonance[J].J.Phys.Chem.Solids,2003(64):953-960.
[15] T.D. Dunber,W. L. Warren,B. A. Tuttle,et al. Electron paramagnetic resonance investigation of lanthanidedoped barium titanate:dopant site occupancy[J]. J.Phys.Chem.B,2004(108):908-917.