Structure and dielectric properties of A-site-deficient perovskite Nd (1 − x)/3 M x NbO 3 (M = Li, Ag; 0 ≤ x ≤ 0.20) ceramics
作者： Xia Jin , Qing Hong Guo , Jian Jiang Bian
DOI: 10.1007/S10853-012-6509-9
关键词:
摘要: Crystal structure and dielectric properties of the A-site-deficient perovskites Nd(1 − x)/3MxNbO3 (M = Li, Ag; 0 ≤ x 0.20) ceramics were investigated with X-ray diffractometer (XRD), network analyzer, impedance analyzer. XRD results showed that no secondary phase was observed for Ag-doped specimens. However, a second LiNdNb2O7 appeared Li-doped ones when ≥ 0.16. The crystal at room temperature transformed from orthorhombic (0 < 0.16) into tetragonal symmetry (0.16 increase x. Complex analysis measured low frequency loss in mainly caused by lithium or silver ionic conduction, which increased temperature. originated conductivity frozen microwave frequency. constant (er) addition Ag, whereas it decreased Li addition. pure specimens exhibited large positive coefficient resonant (τf), while τf value changed negative Q × f 437 to 1,110 GHz case doping 765 Ag doping, respectively, 0.12. Further values both Li- Good combined er 153, −45 ppm/°C could be obtained specimen
springer.com
harvard.edu
sci-hub.se 参考文章(19)
In-Seon Kim, Woo-Hwan Jung, Yoshiyuki Inaguma, Tetsuro Nakamura, Mitsuru Itoh, Dielectric properties of a-site deficient perovskite-type lanthanum-calcium-titanium oxide solid solution system [(1 − x)La23TiO3 − xCaTiO3 (0.1 ≤ x ≤ 0.96)] Materials Research Bulletin. ,vol. 30, pp. 307- 316 ,(1995) , 10.1016/0025-5408(94)00142-1
D SUVOROV, M VALANT, S SKAPIN, D KOLAR, Microwave dielectric properties of ceramics with compositions along the La2/3TiO3(STAB)–LaAlO3 tie line Journal of Materials Science. ,vol. 33, pp. 85- 89 ,(1998) , 10.1023/A:1004341512349
P. N. Iyer, A. J. Smith, Double oxides containing niobium, tantalum, or protactinium. III. Systems involving the rare earths Acta Crystallographica. ,vol. 23, pp. 740- 746 ,(1967) , 10.1107/S0365110X67003639
A. K. Jonscher, A new understanding of the dielectric relaxation of solids Journal of Materials Science. ,vol. 16, pp. 2037- 2060 ,(1981) , 10.1007/BF00542364
Zhaoming Zhang, Christopher J. Howard, Brendan J. Kennedy, Kevin S. Knight, Qingdi Zhou, Crystal structure of Ln1/3NbO3 (Ln=Nd, Pr) and phase transition in Nd1/3NbO3 Journal of Solid State Chemistry. ,vol. 180, pp. 1846- 1851 ,(2007) , 10.1016/J.JSSC.2007.03.029
J.J. Bian, K. Yan, J. Ji, Structure and microwave dielectric properties of La(2−x)/3Nax(Mg1/2W1/2)O3 Journal of the European Ceramic Society. ,vol. 26, pp. 1957- 1960 ,(2006) , 10.1016/J.JEURCERAMSOC.2005.09.040
V.J. Fratello, C.D. Brandle, Calculation of dielectric polarizabilities of perovskite substrate materials for high-temperature superconductors Journal of Materials Research. ,vol. 9, pp. 2554- 2560 ,(1994) , 10.1557/JMR.1994.2554
Jianjiang Bian, Gao Hong Bo, Wang Xiaowu, Microwave dielectric properties of (Pb1−3x/2Lax)(Mg1/2W1/2)O3 Materials Research Bulletin. ,vol. 39, pp. 2127- 2135 ,(2004) , 10.1016/J.MATERRESBULL.2004.06.006
J.J. Bian, Y.Z. Li, Structural evolution and microwave dielectric properties of A-site deficient perovskite La(1−x)/3NaxNbO3 (0.0 < x ≤ 0.4) Materials Chemistry and Physics. ,vol. 122, pp. 617- 622 ,(2010) , 10.1016/J.MATCHEMPHYS.2010.03.056
A.G. Belous, O.V. Ovchar, Temperature compensated microwave dielectrics based on lithium containing titanates Journal of The European Ceramic Society. ,vol. 23, pp. 2525- 2528 ,(2003) , 10.1016/S0955-2219(03)00185-7