MgSn 0.05 Ti 0.95 O 3 SrTiO 3

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41 1 2013 1 JOURNAL OF THE CHINESE CERAMIC SOCIETY 7 Vol. 41 No. 1 January 2013 MgSn 0.05 Ti 0.95 O 3 SrTiO 3 1 1 1 2 2 1 (1. 210009 2. 526000) (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 MgSn 0.05 Ti 0.95 O 3 SrTiO 3 SrTiO 3 (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (ε r ) (Q f) (τ f ) x τ f τ f Lichtenecker 0.98MgSn 0.05 Ti 0.95 O 3 0.02SrTiO 3 1 330 4 h ε r = 19.32 Q f = 193.527 THz τ f = 2 10 6 / TQ174.75 A 0454 5648(2013)01 Microwave Dielectric Properties of MgSn 0.05 Ti 0.95 O 3 SrTiO 3 Multiphase Ceramics GONG Zhijie WANG Zhefei WANG Lixi HAN Wei FU Zhenxiao ZHANG Qitu (1. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China; 2. Guangdong Fenghua Advanced Technology Company Limited, Guangdong 526020, China) Abstract: The microwave dielectric multiphase ceramics of (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 were prepared by a conventional solid-state route. The sinterability, microstructures and microwave dielectric properties of the multiphase ceramics were investigated. The results show that MgSn 0.05 Ti 0.95 O 3 and SrTiO 3 can co-exist as two phases without any solid solution. The relative dielectric constant (ε r ) linearly increased, the quality factor (Q f ) decreased and the value of the temperature coefficient of resonance frequency (τ f ) varied from negative to positive with the increase of SrTiO 3 content. In addition, a near-zero τ f value was obtained by the adjustment of the value of x. The variation in the the value of τ f of (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 multiphase ceramics followed the Lichtenecker mixture rules. The multiphase ceramic 0.98MgSn 0.05 Ti 0.95 O 3 0.02SrTiO 3 sintered at 1 330 for 4 h had excellent microwave dielectric properties (i.e., ε r = 19.32, Q f = 193.527 THz, τ f = 2 10 6 / ). Key words: microwave dielectric ceramic; multiphase ceramics; dielectric properties; quality factor [1] [2] MgTiO 3 (ε r = 16.8 Q f = 160 THz τ f = 50 10 6 / ) [3] Sohn [4] Huang [5] Co 2+ Zn 2+ MgTiO 3 A Mg 2+ MgTiO 3 [4] ( ) 5% Mg 0.95 Co 0.05 TiO 3 (ε r = 16.8 Q f = 230 THz τ f = 54 10 6 / ) Mg 0.95 Zn 0.05 TiO 3 (ε r = 17.1 Q f = 264 THz τ f = 40.3 10 6 / ) Tseng [6] Sn 4+ MgTiO 3 B Ti 4+ MgTiO 3 5% ( ) ε r = 2012 07 09 2012 09 19 (PAPD) (10KJB430008) (2011A091103002) (1988 ) (1962 ) Received date: 2012 07 09. Revised date: 2012 09 19. First author: GONG Zhijie (1988 ), male, Master candidate. E-mail: gongzhijie1988@126.com Correspondent author: ZHANG Qitu (1962 ), male, Ph.D., Professor. E-mail: njzqt@126.com

8 2013 17.4 Q f = 322 THz τ f = 54 10 6 / A B MgTiO 3 MgTiO 3 CaTiO 3 n(mg): n(ca) = 95:5 0.95MgTiO 3 0.05CaTiO 3 ε r 21 Q f 56 THz τ f 0 10 6 / 1 400 1 450 Q f Sn B Mg MgTiO 3 SrTiO [7] 3 (ε r = 190 Q f = 4.2 THz τ f = 1 600 10 6 / ) CaTiO 3 (ε r = 170 Q f = 3.6 THz τ f = 800 10 6 / ) Q f SrTiO 3 MgTiO 3 1 1.1 Mg(OH) 2 TiO 2 SnO 2 SrCO 3 ( > 99.9% ) (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 MgSn 0.05 Ti 0.95 O 3 SrTiO 3 12 h 1 100 4 h (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = 0.01 0.05 ) 12 h 7% PVA φ 13 mm 6 mm 1 300 1 390 4 h 1.2 Archimedes D/Max 2500 X JEM-5900 Hakki Coleman [8] Aglient 8722ET f80 f25 τ f = (1) f25 ( t80 t25) f 80 80 f 25 25 2 2.1 1 (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = 0.01 0.05) 1 330 X (XRD) 1 MgTiO 3 (JCPDS 06 0494) SrTiO 3 (JCPDS 35 0724) MgTi 2 O 5 (JCPDS 35 0792) x SrTiO 3 MgTiO 3 SrTiO 3 Mg 2+ 0.072 nm Sr 2+ 0.144 nm [9] MgTiO 3 SrTiO 3 MgTi 2 O 5 (ε r = 17.4 Q f = 47 THz τ f = 66 10 6 / ) [10] MgTi 2 O 5 MgTiO 3 [11] 1 1 330 (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 XRD Fig. 1 XRD patterns of (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 ceramics sintered at 1 330 2.2 2 (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = 0.01 0.05) 1 330 SEM 2 SrTiO 3 SrTiO 3 SrTiO 3

MgSn 0.05 Ti 0.95 O 3 SrTiO 3 9 3 4%SrTiO 3 MgSn 0.05 Ti 0.95 O 3 1 330 EDS Mg Ti Sr Sn 4 Mg Ti Sn 3 Sr 1 XRD 2 1 330 (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 SEM Fig. 2 SEM micrographs of (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 ceramics sintered at 1 300 3 1 330 MgSn 0.05 Ti 0.95 O 3 0.04SrTiO 3 EDS Fig. 3 EDS spectra of MgSn 0.05 Ti 0.95 O 3 0.04SrTiO 3 ceramics sintered at 1 330

10 2013 Sn MgTi 2 O 5 SrTiO 3 [12] Sn MgTiO 3 A B 1 1 A n(sr):n(ti) 1:1 SrTiO 3 Sn n(mg):n(ti) 1:2 MgTi 2 O 5 B n(mg):n(ti) 1:1 MgSn 0.05 Ti 0.95 O 3 SrTiO 3 SrTiO 3 MgTiO 3 XRD 1 MgSn 0.05 Ti 0.95 O 3 0.04SrTiO 3 A B( 1 ) EDS Table 1 EDS date of MgSn 0.05 Ti 0.95 O 3 0.04SrTiO 3 for spot A and area B in Fig. 3a Spot A Area B Atom Mole fraction/% Atom Mole fraction/% Mg K 3.41 Mg K 28.95 Sn K 0.76 Sn K 1.42 Ti K 36.52 Ti K 27.56 Sr L 30.01 Sr L 0 O K 29.30 O K 42.08 2.3 4a (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = 0.01 0.05) 1 330 (ε r ) SrTiO 3 SEM SrTiO 3 SrTiO 3 (5.119 g/cm 3 ) MgTiO 3 (3.894 g/cm 3 ) SrTiO 3 18.51 21.56 Clausius- Mossotti Sr 2+ 4b (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = 0.01 0.05) 1 330 Q f (τ f ) (1/Q) [13] [14] SrTiO 3 Q f ( 245.451 THz 47.113 THz) SrTiO 3 4 (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 ε r Q f τ f Fig. 4 Bulk density and dielectric constant ε r and Q f and τ f of (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 ceramics as a function of SrTiO 3 content (x) Q f [15] τ f SrTiO 3 τ f 22 10 6 / 61 10 6 / SrTiO 3 τ f 1600 10 6 / MgSn 0.05 Ti 0.95 O 3 τ f 54 10 6 / Lichtenecker [16] τ = vτ + vτ (2) f 1 f1 2 f2 τ f1 τ f2 v 1 v 2 v 1 +v 2 = 1 SrTiO 3 τ f τ f SrTiO 3 MgSn 0.05 Ti 0.95 O 3 τ f 2% SrTiO 3 τ f 2 10 6 / 0.98MgSn 0.05 Ti 0.95 O 3 0.02SrTiO 3 ε r = 19.32 Q

MgSn 0.05 Ti 0.95 O 3 SrTiO 3 11 f = 193.527 THz τ f = 2 10 6 / 0.98MgSn 0.05 Ti 0.95 O 3 0.02SrTiO 3 2 0.98MgSn 0.05 Ti 0.95 O 3 0.02SrTiO 3 τ f τ f Q f 1 330 1 390 MgTiO 3 SrTiO 3 2 Q f 0.98MgSn 0.05 Ti 0.95 O 3 0.02SrTiO 3 Q f 2 0.98MgSn 0.05 Ti 0.95 O 3 0.02SrTiO 3 Table 2 Dielectric properties of 0.98MgSn 0.05 Ti 0.95 O 3 0.02Sr TiO 3 ceramics sintered at different temperatures Sintering temperature/ (g cm 3 r Bulk density/ Q f value/ τ f 10 6 / Porosity/% ε ) THz 1 1 300 3.89 5.4 18.96 141.103 3 1 330 3.94 3.9 19.32 193.527 2 1 360 3.92 4.2 19.06 111.816 2 1 390 3.83 11.2 18.18 39.166 6 3 (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 x τ f SrTiO 3 MgSn 0.05 Ti 0.95 O 3 1 330 x = 0.2 ε r = 19.32 Q f = 193.527 THz τ f = 2 10 6 / 0.95MgTiO 3 0.05CaTiO 3 0.98MgSn 0.05 Ti 0.95 O 3 0.02SrTiO 3 [1],,,. [J]., 2003, 31(10): 965 973, 980. YANG Hui, ZHANG Qilong, WANG Jiabang, et al. J Chin Ceram Soc, 2003, 31(10): 965 973, 980. [2],,,. SrCO 3 BMT [J]., 2012, 39(12): 1947 1952. PENG Sen, WU Mengqiang, XIAO Yong, et al. J Chin Ceram Soc, 2012, 39(12): 1947 1952. [3] FERREIRA V M, AZOUGH F, BAPTISTA J L, et al. Dic 12: Magnesium titanate microwave dielectric ceramics [J]. Ferroelectrics, 1992, 133(1): 127 132. [4] SOHN J H, INAGUMA Y, YOON S O, et al. Microwave dielectric characteristics of ilmenite-type titanates with high Q values [J]. Jpn J Appl Phys, 1994, 33(9B): 5466 5470. [5] HUANG C L, LIU S S. Characterization of extremely low loss dielectrics (Mg 0. 95 Zn 0. 05 ) TiO 3 at microwave frequency [J]. Jpn J Appl Phys, 2007, 46(1): 283. [6] TSENG Ching-Fang, HSU Cheng-Hsing. A new compound with ultra low dielectric loss at microwave frequencies [J]. J Am Ceram Soc, 2009, 92(5): 1149 1152. [7] BALL C J, BEGG B D, COOKSON D J, et al. Structures in the system CaTiO 3 /SrTiO 3 [J]. J Solid State Chem, 1998, 139(2): 238 247. [8] HAKKI B W, COLEMAN P D. A dielectric resonator method of measuring inductive capacities in the millimeter range [J]. Microwave Theory and Techniques, IRE Transactions on, 1960, 8(4): 402 410. [9] SHANNON R D. Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides [J]. Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography, 1976, 32(5): 751 767. [10] SHIN H K, SHIN H, CHO SY, et al. Phase evolution and dielectric properties of MgTiO 3 CaTiO 3 based ceramic sintered with lithium borosilicate glass for application to low temperature co-fired ceramics [J]. J Am Ceram Soc, 2005, 88(9): 2461 2465. [11] HUANG C L, PAN C L. Low-temperature sintering and microwave dielectric properties of (1 x)mgtio 3 xcatio 3 ceramics using bismuth addition [J]. Jpn J Appl Phys, 2002, 41(2A): 707 711. [12] CHO W W, KAKIMOTO K, OHSATO H. High-Q microwave dielectric SrTiO 3 doped MgTiO 3 materials with near-zero temperature coefficient of resonant frequency [J]. Jpn J Appl Phys, 2004, 43(9): 6221 6224. [13]. Ba(Zn 1/3 Nb 2/3 )O 3 [D]. :, 2003. SHI Feng. The study of dielectric properties of Ba(Zn 1/3 Nb 2/3 )O 3 microwave dielectric ceramics [Dissatation, in Chinese]. Hangzhou: Zhejiang University, 2003. [14] FREER R, AZOUGH F. Microstructural engineering of microwave dielectric ceramics [J]. J Euro Ceram Soc, 2008, 28(7): 1433 1441. [15] HUANG C L, WANG J J, CHANG Y P. Dielectric properties of low loss (1 x)(mg 0.95 Zn 0.05 )TiO 3 xsrtio 3 ceramic system at microwave frequency [J]. J Am Ceram Soc, 2007, 90(3): 858 862. [16] LICHTENECKER K. Dielectric constant of natural and synthetic mixtures [J]. Physics (Z), 1926, 27: 115.

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