MgSn 0.05 Ti 0.95 O 3 SrTiO 3

Μέγεθος: px

Εμφάνιση ξεκινά από τη σελίδα:

Download "MgSn 0.05 Ti 0.95 O 3 SrTiO 3"

Ανθούσα Λιακόπουλος
5 χρόνια πριν
Προβολές:

1 JOURNAL OF THE CHINESE CERAMIC SOCIETY 7 Vol. 41 No. 1 January 2013 MgSn 0.05 Ti 0.95 O 3 SrTiO ( ) (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 SrTiO h ε r = Q f = THz τ f = / TQ A (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 , China; 2. Guangdong Fenghua Advanced Technology Company Limited, Guangdong , 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 SrTiO 3 sintered at for 4 h had excellent microwave dielectric properties (i.e., ε r = 19.32, Q f = THz, τ f = / ). 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 = / ) [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 = / ) Mg 0.95 Zn 0.05 TiO 3 (ε r = 17.1 Q f = 264 THz τ f = / ) Tseng [6] Sn 4+ MgTiO 3 B Ti 4+ MgTiO 3 5% ( ) ε r = (PAPD) (10KJB430008) (2011A ) (1988 ) (1962 ) Received date: Revised date: First author: GONG Zhijie (1988 ), male, Master candidate. gongzhijie1988@126.com Correspondent author: ZHANG Qitu (1962 ), male, Ph.D., Professor. njzqt@126.com

2 Q f = 322 THz τ f = / A B MgTiO 3 MgTiO 3 CaTiO 3 n(mg): n(ca) = 95:5 0.95MgTiO CaTiO 3 ε r 21 Q f 56 THz τ f / Q f Sn B Mg MgTiO 3 SrTiO [7] 3 (ε r = 190 Q f = 4.2 THz τ f = / ) CaTiO 3 (ε r = 170 Q f = 3.6 THz τ f = / ) Q f SrTiO 3 MgTiO 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 h (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = ) 12 h 7% PVA φ 13 mm 6 mm h 1.2 Archimedes D/Max 2500 X JEM-5900 Hakki Coleman [8] Aglient 8722ET f80 f25 τ f = (1) f25 ( t80 t25) f f (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = ) X (XRD) 1 MgTiO 3 (JCPDS ) SrTiO 3 (JCPDS ) MgTi 2 O 5 (JCPDS ) x SrTiO 3 MgTiO 3 SrTiO 3 Mg nm Sr nm [9] MgTiO 3 SrTiO 3 MgTi 2 O 5 (ε r = 17.4 Q f = 47 THz τ f = / ) [10] MgTi 2 O 5 MgTiO 3 [11] (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 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = ) 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 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

3 MgSn 0.05 Ti 0.95 O 3 SrTiO %SrTiO 3 MgSn 0.05 Ti 0.95 O EDS Mg Ti Sr Sn 4 Mg Ti Sn 3 Sr 1 XRD (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 MgSn 0.05 Ti 0.95 O SrTiO 3 EDS Fig. 3 EDS spectra of MgSn 0.05 Ti 0.95 O SrTiO 3 ceramics sintered at 1 330

4 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 SrTiO 3 A B( 1 ) EDS Table 1 EDS date of MgSn 0.05 Ti 0.95 O SrTiO 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 Sn K 0.76 Sn K 1.42 Ti K Ti K Sr L Sr L 0 O K O K a (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = ) (ε r ) SrTiO 3 SEM SrTiO 3 SrTiO 3 (5.119 g/cm 3 ) MgTiO 3 (3.894 g/cm 3 ) SrTiO Clausius- Mossotti Sr 2+ 4b (1 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 (x = ) Q f (τ f ) (1/Q) [13] [14] SrTiO 3 Q f ( THz 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 / / SrTiO 3 τ f / MgSn 0.05 Ti 0.95 O 3 τ f / 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 / 0.98MgSn 0.05 Ti 0.95 O SrTiO 3 ε r = Q

5 MgSn 0.05 Ti 0.95 O 3 SrTiO 3 11 f = THz τ f = / 0.98MgSn 0.05 Ti 0.95 O SrTiO MgSn 0.05 Ti 0.95 O SrTiO 3 τ f τ f Q f MgTiO 3 SrTiO 3 2 Q f 0.98MgSn 0.05 Ti 0.95 O SrTiO 3 Q f MgSn 0.05 Ti 0.95 O SrTiO 3 Table 2 Dielectric properties of 0.98MgSn 0.05 Ti 0.95 O Sr 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 x)mgsn 0.05 Ti 0.95 O 3 xsrtio 3 x τ f SrTiO 3 MgSn 0.05 Ti 0.95 O x = 0.2 ε r = Q f = THz τ f = / 0.95MgTiO CaTiO MgSn 0.05 Ti 0.95 O SrTiO 3 [1],,,. [J]., 2003, 31(10): , 980. YANG Hui, ZHANG Qilong, WANG Jiabang, et al. J Chin Ceram Soc, 2003, 31(10): , 980. [2],,,. SrCO 3 BMT [J]., 2012, 39(12): PENG Sen, WU Mengqiang, XIAO Yong, et al. J Chin Ceram Soc, 2012, 39(12): [3] FERREIRA V M, AZOUGH F, BAPTISTA J L, et al. Dic 12: Magnesium titanate microwave dielectric ceramics [J]. Ferroelectrics, 1992, 133(1): [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): [5] HUANG C L, LIU S S. Characterization of extremely low loss dielectrics (Mg Zn ) 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): [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): [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): [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): [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): [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): [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): [13]. Ba(Zn 1/3 Nb 2/3 )O 3 [D]. :, 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, [14] FREER R, AZOUGH F. Microstructural engineering of microwave dielectric ceramics [J]. J Euro Ceram Soc, 2008, 28(7): [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): [16] LICHTENECKER K. Dielectric constant of natural and synthetic mixtures [J]. Physics (Z), 1926, 27: 115.

Σχετικά έγγραφα

Microwave Sintering of Electronic Ceramics

25,,, Microwave Sintering of Electronic Ceramics Hideoki Fukushima, Goro Watanabe, Hiroyuki Mori, Masao Matsui ZnO PZT ZnO PZT Microwave heating offers advantages over conventional technologies such as