硅酸盐学报

(Mg_1–xCa_x)₂Al₄Si₅O₁₈陶瓷的相演变与微波介电性能

作者：宋开新胡晓萍郑鹏徐军明秦会斌应智花郑梁

关键词：堇青石钙长石微波介电性能

分类号：TM221

出版年,卷(期):页码：2012,40(2):300-305

DOI：

摘要：

摘要：采用固相烧结反应法制备(Mg₁_–_x,Ca_x)₂Al₄Si₅O₁₈陶瓷。XRD测试结果表明：0≤x<0.2时，陶瓷以(Mg,Ca)₂Al₄Si₅O₁₈堇青石单一相固溶体形式存在；0.2≤x<0.8时，陶瓷以Mg₂Al₄Si₅O₁₈/CaAl₂Si₂O₈两相复合形式存在；0.8≤x<1.0时，陶瓷以单一相(Ca,Mg)Al₂Si₂O₈固溶体形式存在。SEM结果显示：Ca²⁺掺杂可以有效地降低堇青石陶瓷的气孔率与微裂纹，并能有效地控制Mg₂Al₄Si₅O₁₈/CaAl₂Si₂O₈复相陶瓷的颗粒分布与晶粒尺寸。微波介电性能测试结果表明：0≤x≤0.4时，(Mg₁_–_xCa_x)₂Al₄Si₅O₁₈陶瓷介电常数ε_r为7.0左右；0.6≤x≤1.0时，ε_r从7.0增加到8.6，然后又降低到6.9。随着x增加，品质因数Qf值从24100GHz降低到4400GHz。但是，在x=0.6时，由于[Si,AlO₄]四面体中Al/Si原子排列的有序化，(Mg_0.4,Ca_0.6)₂Al₄Si₅O₁₈陶瓷Qf值(Qf =5 500 GHz)比两侧x值成分点Qf值有较大提高。(Mg₁_–_x,Ca_x)₂Al₄Si₅O₁₈陶瓷谐振频率温度系数在整个x值范围内保持在–20×10^–⁶～–35×10^–⁶℃^–¹。

Abstracts: (Mg₁_–x,Ca_x)₂Al₄Si₅O₁₈ ceramics were fabricated by a conventional ceramic sintering method. The results by X-ray diffraction showed that the (Mg,Ca)₂Al₄Si₅O₁₈ solid solution were formed in the range of 0≤x<0.2, and (Ca,Mg)Al₂Si₂O₈ solid solution was formed in the range of 0.8≤x≤1.0, and the composite phases of both Mg₂Al₄Si₅O₁₈ and CaAl₂Si₂O₈ ceramics existed in the range of 0.2≤x<0.8. The results by scanning electron microscopy showed that the porosity and micro-cracks of cordierite ceramics were effectively suppressed, the crystal growth and particle distribution of the composite phase of Mg₂Al₄Si₅O₁₈/CaAl₂Si₂O₈ ceramics were controlled, along with Ca²⁺ doping. The dielectric constants of (Mg₁_–x,Ca_x)₂Al₄Si₅O₁₈ceramics retained at 7.0 in the range of 0≤x≤0.4. Afterwards, it increased from 7.0 at x=0.6 to 8.6 at x=0.8 and then decreased to 6.9 at x=1.0. The Qf values decreased from 24100GHz of x=0 to 4400GHz of x=1.0 in the range of 0≤x≤1. However, the Qf value reached 5500GHz at x = 0.6, due to the improvement of [Si,AlO₄] inoic orders, which was higher than that of other compositional point in the range of 0.4≤x≤1.0. The temperature coefficients of resonant frequency (τ_f) of (Mg₁_–x,Ca_x)₂Al₄Si₅O₁₈ ceramics were –20×10^–6to –35×10^–6℃^–1.

基金项目：

国家自然科学基金(60901034)；浙江省自然科学基金(Y1090- 146，Y1101252，Y1110992)；电子科技大学电子薄膜与集成器件国家重点实验室开放课题(KFJJ201014)；浙江省重点科技创新团队项目(2011R09006–05)资助。

作者简介：

第一作者：宋开新(1977—)，男，博士，副教授。

参考文献：

[1] Reaney I M, Iddles D. Microwave dielectric ceramics for fesonators and filters in mobile phone networks [J]. J Am Ceram Soc, 2006, 89(7): 2063–2072.

[2] Federici J, MoelleL. Review of terahertz and sub terahertz wireless communications [J]. J Appl Phys, 2010, 107(11): 111101–111123.

[3] Fujii T, Ando A, Sakabe Y. Characterizations of dielectric properties of oxide materials in frequency range from GHz to THz [J]. J Eur Ceram Soc, 2006, 26(10/11): 1857–1860.

[4] 王玉梅, 李玲霞, 吴霞宛, 等. (Zn₁_–xMg_x)TiO₃微波陶瓷系统介电性能的研究[J]. 硅酸盐学报, 2004, 32(8): 911–915.

WANG Yumei, LI Lingxia, WU Xiawan, et al. J Chin Ceram Soc, 2004, 32(8): 911–915.

[5] 宋开新, 应智花, 徐军明, 等. (Zn₁_–xMg_x)₂SiO₄陶瓷微波介电性能研究[J]. 无机材料学报, 2010, 25(3): 255–258.

SONG Kaixin, YING Zhihua, XU Junming, et al. J Inorg Mater, 2010, 25(3): 255–258.

[6] Guo Y P, Ohsato H, Kakimoto K. Characterization and cielectric behavior of willemite and TiO₂-doped willemite ceramics at millimeter-wave frequency [J]. J Eur Ceram Soc, 2006, 26(10–11): 1827– 1830.

[7] Terada M, Kawamura K, Kagomiya I, et al. Effect of Ni substitution on the microwave dielectric properties of cordierite [J]. J Eur Ceram Soc, 2007, 27(8–9): 3045–3048.

[8] Joseph T, Sebastian M T. Microwave dielectric properties of (Sr₁_–xA_x)₂(Zn₁_–xB_x)Si₂O₇ ceramics (A=Ca, Ba and B=Co, Mg, Mn, Ni)[J]. J Am Ceram Soc, 2010, 93(1): 147–154.

[9] Krzmanc M M, Valant M, Jancar B, et al. Sub-solidus synthesis and microwave dielectric characterization of plagioclase feldspars [J]. J Am Ceram Soc, 2005, 88(9): 2472–2479.

[10] Krzmanc M M, Valant M, Suvorov D. The synthesis and microwave dielectric properties of Sr_xBa₁_–xAl₂Si₂O₈ and Ca_xBa₁_–xAl₂Si₂O₈ ceramics [J]. J Eur Ceram Soc, 2007, 27(8–9): 1181–1185.

[11] Meng S Q, Yue Z X, Zhuang H, et al. Microwave dielectric properties of Ba₃(VO₄)₂–Mg₂SiO₄ composite ceramics [J]. J Am Ceram Soc, 2010, 93(2): 359–361.

[12] Ohasto H, Tsunooka T, Sugiyama T, et al. Forsterite ceramics for millimeter wave dielectrics [J]. J Electroceram, 2006, 17(2–4): 445–50.

[13] Ohsato H, Kagomiya I, Kakimoto K. Origin of improvement of Q based on high symmetry accompanying Si–Al disordering in cordierite millimeter-wave ceramics [J]. J Eur Ceram Soc, 2010, 30(2): 315–318.

[14] Camerucci M A, Urretavizcaya G, Castro M S, et al. Electrical properties and thermal expansion of cordierite and cordierite-mullite materials [J]. J Eur Ceram Soc, 2001, 21(16): 2917–2923.

[15] 陈国华. 低温共烧玻璃陶瓷材料的制备及性能、机理研究[D]. 长沙: 中南大学博士学位论文, 2006.

CHEN Guohua. Study on preparation, properties and mechanism of low temperature co-fired glass ceramic materials (in Chinese, dissertation) .Changsha: CentralSouthUniversity, 2006.

[16] Hakki B W, Coleman P D. A dielectric resonant method of measuring inductive capacitance in the millimeter range [J]. IEEE Trans MicroTheor Tech, 1960, 8(4): 402–410.

[17] 王晓凤. La³⁺/CeO₂对堇青石陶瓷的改性研究[D]. 呼和浩特：内蒙古工业大学硕士学位论文, 2005.

WANG Xiaofeng. The effects of La³⁺/CeO₂ doping on coridierite ceramics (in Chinese, dissertation), Huhehaote: Inner Mongolia University of Technology, 2005.

[18] Shannon R D. Dielectric polarizabilities of ions in oxides and fluorides [J]. J Appl Phys, 1993, 73(1): 348–66.

[19] Freer R, Azough F. Microstructural engineering of microwave dielectric ceramics [J]. J Eur Ceram Soc, 2008, 28(7): 1433–1441.

[20] Penn S J, Alford N McN, Templeton A, et al. Effect of porosity and grain size on the microwave sielectric properties of sintered alumina [J]. J Am Ceram Soc, 1997, 80(7): 1885–1888.

[21] Krzmanc M M, Jancar B, Suvorov D. The influence of tetrahedral ordering on the microwave dielectric properties of Sr_0.05Ba_0.95Al₂Si₂O₈ and BaM₂M′₂O₈ (M=Al, Ga, M^’=Si, Ge) ceramics [J]. J Eur Ceram Soc, 2008, 28(16): 3141–3148.

服务与反馈：

【文章下载】【加入收藏】