Mg4Nb2O9具有与α-Al2O3相同的刚玉型晶体结构,可望成为新一代高Q、低ε基板材料.然而,该材料却具有很大的负谐振频率温度系数(τf=-7.05×10-5/℃),期望通过添加TiO2(τf=4.50×10-4/℃)以达到调整的目的.适量的添加TiO2将Mg4Nb2O9陶瓷的烧结温度降低了约100℃,并增强了陶瓷的性能,微波介电性能与其密度呈线性关系.由于添加的TiO2与Mg5Nb4O15反应形成了(Ng,Ti)5(Nb,Ti)4O15第二相,使得TiO2对该陶瓷τf值的调整作用不显著.1300℃、5h烧结添加质量分数为2.5%的TiO2的Mg4Nb2O9陶瓷具有最佳的性能:εr=13.61,Q·f=196620GHz,τf=-5.04×10-5/℃.
参考文献
[1] | Alford NM.;Penn SJ. .SINTERED ALUMINA WITH LOW DIELECTRIC LOSS[J].Journal of Applied Physics,1996(10):5895-5898. |
[2] | Tsunooka T;Androu M;Higashida Y et al.Effects of TiO2 on sinterability and dielectric roperties of high-Q forsterite ceramics[J].Journal of the European Ceramic Society,2003,23:2573-2578. |
[3] | Ba_(8)ZnTa_(6)O_(24): a high-Q microwave dielectric from a potentially diverse homologous series[J].Applied physics letters,2003(25):4537-4539. |
[4] | Sohn J H;Inaguma Y;Yoon S O et al.Microwave dielectric characteristics of ilmenite-type titanates with high Q values[J].Japanese Journal of Applied Physics,1994,33:5466-5470. |
[5] | Breeze J D;Aupi X;Afford N M .Ultralow loss polycrystalline alumina[J].Applied Physics Letters,2002,81(26):5021-5023. |
[6] | Kumada N;Taki K;Kinomura N .Single crystal structure refinement of a magnesium niobium oxide:Mg4 Nb2 O9[J].Materials Research Bulletin,2000,35:1017-1021. |
[7] | Ogawa H;Kan A;Ishihara S et al.Crystal structure of corundum type Mg4 (Nb2-xTax) O9) microwave dielectric ceramics with low dielectric loss[J].Journal of the European Ceramic Society,2003,23:2485-2488. |
[8] | Yoshida A;Ogawa H;Kan A et al.Influence of Zn and Ni substitutions for Mg on dielectric properties of (Mg4-x Mx) (Nb2-y Sby) O9 (M = Zn and Ni) solid solutions[J].Journal of the European Ceramic Society,2004,24:1765-1768. |
[9] | Takahashi H;Baba Y;Ezaki K et al.Microwave dielectric properties and crystal structure of CaO-Li2O-(1-x) Sm2O3-xLn2O3-TiO2 (Ln:lanthanide) ceramics system[J].Japanese Journal of Applied Physics,1996,35:5069-5073. |
[10] | Kato J;Kagata H;Nishimoto K .Dielectric properties of lead alkaline-earth zirconate at microwave frequencies[J].Japanese Journal of Applied Physics,1991,30(9B):2343-2346. |
[11] | Wen-Cheng Tzou;Sang-Li Chang;Cheng-Fu Yang;Ying-Chung Chen .Sintering and dielectric properties of 0.88Al_2O_3-0.12TiO_2 microwave ceramics by glass addition[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2003(6):981-989. |
[12] | Tsunooka T;Androua M;Higashidaa Y et al.Effects of TiO2 on sinterability and dielectric properties of high-Q forsterite ceramics[J].Journal of the European Ceramic Society,2003,23(14):2573-2578. |
[13] | Templeton A.;Wang X. .Microwave Dielectric Loss of Titanium Oxide[J].Journal of the American Ceramic Society,2000(1):95-100. |
[14] | Hakkit B W;Coleman P D .A dielectric resonator method of measuring inductive capacities in the millimeter range[J].IEEE Transactions on Microwave theory and Techniques,1960,8:402-410. |
[15] | 苏未安,边小兵,刘鹏.Mg4Nb2O9的合成及其微波性能[J].硅酸盐通报,2005(01):48-50. |
[16] | Dong-Wan Kim;Kyung Hyun Ko;Do-Kyun Kwon .Origin of Microwave Dielectric Loss in ZnNb_2O_6-TiO_2[J].Journal of the American Ceramic Society,2002(5):1169-1172. |
[17] | Shannon R D;Prewitt C D .Effective ionic radii in oxides and fluorides[J].Acta Crystallographica,1969,B25:925-945. |
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