采用传统固相法制备Nd[(Zn1?xCox)0.5Ti0.5]O3 (0≤x≤0.9)微波介质陶瓷，研究Co2+在B位取代Zn2+对Nd(Zn0.5Ti0.5)O3微波介质陶瓷的结构和微波介电性能的影响. 结果表明，在研究的组分范围内，Nd[(Zn1?xCox)0.5Ti0.5]O3陶瓷均能形成单斜钙钛矿型固溶体，随Co取代量增加，陶瓷的相对介电常数?r逐渐减小，谐振频率温度系数?f逐渐向负值移动，品质因数Q×f先增大后下降，在x=0.3 mol时达到最大值215130 GHz, Q×f大幅增加是有序度作用所致. 在1410℃下烧结4 h, Nd[(Zn0.7Co0.3)0.5Ti0.5]O3陶瓷具有优异的微波介电性能，?r=31.2, Q×f=215130 GHz, ?f=?35.7×10?6℃?1.
Nd[(Zn1–xCox)0.5Ti0.5]O3 (0≤x≤0.9) microwave dielectric ceramics were prepared by a conventional solid-state route. The effects of Co2+ B-site substitution Zn2+ on the structure and microwave dielectric properties of Nd(Zn0.5Ti0.5)O3 ceramics were extensively investigated. The results showed that a solid solution with the monoclinic perovskite structure was formed in the investigated compositional range. The relative dielectric constant ?r decreased gradually and the temperature coefficient of resonant frequency ?f moved to a positive tendency with the increase of Co substitution. The quality factor Q×f initially increased to a maximum value of 215130 GHz at x=0.3 mol and thereafter declined. The substantial rise of Q×f might be attributed to the improvement of B-site cation ordering. Nd[(Zn0.7Co0.3)0.5Ti0.5]O3 ceramics had good microwave dielectric properties sinteringat 1410℃ for 4 h, ?r=31.2, Q×f=215130 GHz, ?f=?35.7×10?6℃?1.
[1]Reaney I M, Iddles D.Microwave dielectric ceramics for resonators and filters in mobile phone networks[J].J. Eur. Ceram. Soc., 2006, 89(7):2063-2072 [2]Ohsato H.Functional advances of microwave dielectrics for next generation[J].Ceram. Int., 2012, 38(S1):S141-S146 [3] Wu H T, Kim E S.Characterization of low loss microwave dielectric materials Li3Mg2NbO6 based on the chemical bond theory [J]. J. Alloy. Compd., 2016, 669: 134–140.[J]., 2016, 669:134-140 [4]Kim Y W, Park J H, Park J G.Local cationic ordering behavior in Ba(Mg13Nb23)O3 ceramics[J].J. Eur. Ceram. Soc., 2004, 24(6):1775-1779 [5]Ichinose N, Shimada T.Effect of grain size and secondary phase on microwave dielectric properties of Ba(Mg13Ta23)O3 and Ba([Mg,Zn]13Ta23)O3 systems[J].J. Eur. Ceram. Soc., 2006, 26(1011):1755-1759 [6]Ma P P, Yi L, Liu X Q, et al.Effects of post–densification annealing upon microstructure and microwave dielectric characteristics in Ba((Co06–x2Zn0.4–x2Mgx)13Nb23)O3 ceramics[J].J. Am. Ceram. Soc., 2013, 96(11):3417-3424 [7]Sun T L, Chen X M.Raman spectra analysis for Ba[(Mg1–xNix)13Nb23]O3 microwave dielectric ceramics[J].AIP Adv., 2015, 5(1):3-26 [8]Cho S Y, Kim C H, Kim D W, et al.Dielectric properties of Ln(Mg12Ti12)O3 as substrates for high?Tc superconductor thin films[J].J. Mater. Res., 1999, 14(6):2484-2487 [9]Babu G S， Subramanian V， Murthy V R K， et al.Far–infrared,Raman spectroscopy,and microwave dielectric properties of La(Mg05Ti(0.5?x)Snx)O3 ceramics[J].J. Appl. Phys., 2007, 102(6):064906-1 [10]Chen Y C, Chen M D, Yeh J K.Enhancement microwave dielectric properties of La(Mg05Sn0.5)O3 ceramics by substituting Mg2+ for Co2+[J].Mater. Chem. Phys., 2011, 130(3):1270-1274 [11]Hsu C H.Improved high–Q microwave dielectric resonator using ZnO–doped La(Co12Ti12)O3 ceramics[J].J. Alloy. Compd., 2008, 464(1):412-417 [12]Hsu C H, Chang Y S.Microwave characteristics of high–Q ZnO–doped Nd(Co12Ti12)O3 dielectric ceramics[J].J. Alloy. Compd., 2009, 479(1):714-718 [13]Tseng C F, Huang C L, Yang W R, et al.Dielectric characteristics of Nd(Zn12Ti12)O3 ceramics at microwave frequencies[J].J. Am. Ceram. Soc., 2006, 89(4):1465-1470 [14] 李标荣.电子陶瓷工艺原理 [M]. 武汉: 华中工学院出版社, 1986. [15]Li B R.Processing principle of electronic ceramics [M]. Wuhan: Huazhong University of Technology Press, 1986. [16]Tseng C F, Huang C L, Hsu C H.Low–dielectric loss characteristics of Nd(Co05Ti0.5)O3 ceramics at microwave frequencies[J].J. Am. Ceram. Soc., 2007, 90(5):1619-1622 [17]李懋强.复合钙钛矿型中位有序结构的研究[J].硅酸盐学报, 1996, 24(5):504-508 [18]Li M Q.Ordered structure in complex perovskite Ba(Mg13Ta23)O3[J].J. CHN. Ceram. Soc., 1996, 24(5):504-508 [19]Roberts S.Polarizabilities of ions in perovskite–type crystals[J].Phys. Rev., 1951, 81(5):865-868 [20]Li J M, Fan C G, Ran S L.Structure and microwave dielectric properties of (1–x)Nd(Zn05Ti0.5)O3–xCa0.61Nd0.26TiO3 ceramics[J].Ceram. Int., 2016, 42(1):607-614 [21]Reaney I M, Colla E L, Setter N.Dielectric and structure characteristics of Ba– and Sr–based complex perovskites as a function of tolerance factor[J].Jpn. J. Appl. Phys., 1994, 33(7A):3984-3990 [22]王彦.计算元素电负性的经验公式[J].锦州师范学院学报自然科学版, 1998, 4(1):24-25 [23]Wang Y.The experience formula of calculating negative electricity[J].Jinzhou normal university (Natural Science), 1998, 4(1):24-25
