采用固相反应烧结工艺制备了(Bi_(1.5)Sr_(0.5))(M_(1.5)Nb_(0.5))O_7(BSMN,M =Sn~(4+)、Zr~(4+))新型铋基焦绿石陶瓷.X射线衍射分析表明,BSSN和BSZN陶瓷均形成了立方焦绿石单相结构,无杂相产生.不同于BSSN, BSZN陶瓷材料在1MHz具有显著的正介电常数温度系数特性.四价阳离子Sn~(4+)、Zr~(4+)的分别引入,使得两种材料的介电常数及其温度系数有很大的差别.由于立方焦绿石的主干骨架为顶角相连的BO6八面体[1-2],而氧八面体之间的关联程度与介电性能尤其是介电常数有本质联系.进一步讨论了四价取代阳离子对材料的介电性能的作用规律.
Pyrochlore ceramics with formula (Bi_(1.5)Sr_(0.5)) (M_(1.5)Nb_(0.5)) O_7 (BSMN, M = Sn~(4+) ,Zr~(4+)) were prepared by the traditional solid-state reaction method and systematically investigated. X-ray diffraction (XRD)revealed that pure cubic pyrochlore structure were formed for both samples. New high frequency dielectrics, differed by tetravalent cations, with temperature compensation and controllable permittivity of 56-76 have been developed. Introducing of Sn and Zr cations lead to large differences in permittivity and temperature coefficient of permittivity. Comparing to BSSN, BSZN has the larger temperature coefficient of permittivity at 1 MHz. For the cubic pyrochlore structure, dielectrics with high permittivity are based on structures with BO6-octahedra joined one to another by their tops. The relationships among composition, phase structure and properties were discussed further.
参考文献
| [1] | I Levin;T G Amos;J C Nino et al.Structural Study of an Unusual Cubic Pyrochlore Bil 52n0 92Nb1 506 92[J].Journal of Solid State Chemistry,2002,168:69-72. |
| [2] | R L Withers;T R Welberry;A K Larsson et al.Local crystal chenustry,induced strain and short range order in the cubic pyrochlore (Bil 5-αZn0 5-δ) (Zn0 5-γNb1 5-δ)-O(7-1 5α-β-γ-2 58)[J].Journal of Solid State Chemistry,2004,177:231-244. |
| [3] | 范福康,吴红忠.电子陶瓷材料发展现状、展望与思考[J].电子元件与材料,2005(02):58-60. |
| [4] | Jiwei Lu;Dmitri O. Klenov;Susanne Stemmer .Influence of strain on the dielectric relaxation of pyrochlore bismuth zinc niobate thin films[J].Applied physics letters,2004(6):957-959. |
| [5] | C A Randall;J C Nino;M T Lanagan.Bipyrochlore and zirconolite dielectrics for integrated passive component applications[J].American Ceramic Society Bulletin,2003:9101-9108. |
| [6] | Ren W.;Randall CA.;Shrout TR.;Trolier-McKinstry S. .Bismuth zinc niobate pyrochlore dielectric thin films for capacitive applications[J].Journal of Applied Physics,2001(1):767-774. |
| [7] | J -H Park;S -H Son et al.Bismuth-zmc-niobate embedded capacitorsgrown at room temperature for printed circuit board applications[J].Applied Physics Letters,2006,88:192902. |
| [8] | Jaehoon Park;Lu J.W.;Boesch D.S.;Stemmer S.;York R.A. .Distributed phase shifter with pyrochlore bismuth zinc niobate thin films[J].IEEE microwave and wireless components letters: A publication of the IEEE Microwave Theory and Techniques Society,2006(5):264-266. |
| [9] | H Wang;S Kamba;H Du .Microwave dielectnc relaxation in cubic bismuth based pyrochlores containing titanium[J].Journal of Applied Physics,2006,100:014105. |
| [10] | X Wang;H Wang;X Yao .Structures,Phase Transformations,and Dielectric Ptoperties of Pyrochlores Containing Bismuth[J].Journal of the American Ceramic Society,1997,80:2745. |
| [11] | C Nino;M T Lanagan;C A Randall .Dielectric relaxation in Bi_2O_3-ZnO-Nb_2O_5 cubic pyrochlore[J].Journal of Applied Physics,2001,89:4512. |
| [12] | Du Huiling;Yao Xi .Dielectric properties of pyrochlore(Bi_(1.5)Zn_(0 5)O_7 (M = Ti~(4+) 、Sn~(4+)、Zr~(4+) 、Ce4 +)[J].Applied Physics Letters,2006,88:212901-212903. |
| [13] | Medium permittivity bismuth zinc niobate thin film capacitors[J].Journal of Applied Physics,2003(3):1941-1947. |
| [14] | S Kamba;V Porokhonskyy .A Pashkin et Anomalous broad dielectric relaxation in Bil 5Znl ONb1 5O7 pryochlore[J].Physical Review B:Condensed Matter,2002,66:054106-054114. |
| [15] | B J Wuensch et al.Order-Disorder phenomena in A2B2O7 Pyrochlore Oxides[J].Solid State Ionics,2000,129:111-115. |
| [16] | M A L Nobre;S Lanfredi .Negative temperature coefficient themustor based on B_(13)Zn_2Sb_3O_(14) ceramic:An Oxide Semiconductor at high temperature[J].Applied Physics Letters,2003,8(14):2884-2886. |
| [17] | Juan C Nino;Michael T Lanagan;Clive A Randall .Dielectric relaxation in Bi_2O_3-ZnO-Nb_2O_5 cubic pyrochlore[J].Journal of Applied Physics,2002,81(23):4404-4406. |
| [18] | Nino JC.;Lanagan MT.;Randall CA.;Kamba S. .Correlation between infrared phonon modes and dielectric relaxation in Bi2O3-ZnO-Nb2O5 cubic pyrochlore[J].Applied physics letters,2002(23):4404-4406. |
| [19] | 刘璞凌,丁士华,杨同青,沈波,姚熹.La替代对Bi2O3-ZnO-Nb2O5陶瓷介电性能的影响[J].功能材料与器件学报,2007(01):78-81. |
| [20] | 刘璞凌,丁士华,杨同青,沈波,姚熹.Bi（1.5-x）MxZnNb1.5O7（M=La,Dy）陶瓷介电性能的研究[J].压电与声光,2007(02):201-203. |
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