Dielectric properties of Ba1-xSrxTiO3 single crystal fibers grown by laser heated pedestal growth technique

被引:8
作者
Garcia, D
Guo, R
Bhalla, AS [1 ]
机构
[1] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA
[2] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP, Brazil
关键词
electronic materials; crystal growth; dielectric properties; phase transitions;
D O I
10.1080/10584580210855
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Single crystal fibers of several compositions in the system (Ba1-xSrx)TiO3 (0.10 less than or equal to x less than or equal to 0.40) were grown for the first time using the laser heated pedestal growth (LHPG) technique. High quality crystals were obtained, especially for low Sr contents, yielding the dielectric characterization study. Free growth was performed using ceramic rods as feed and seed. The growth direction as observed at room temperature was related to the strontium content in the crystal. Higher concentrations of strontium tend to favor composition fluctuations but average nominal composition remained the same. Pinching effect of the three phase transformations (cubic-tetragonal, tetragonal-orthorhombic and orthorhombic-rhombohedral) was observed with increase of Sr2+ substitution for Ba2+. The increase in strontium content also resulted in a broadening of the cubic-tetragonal (m3m-4mm) transition peak of dielectric permittivity and a decreasing of the Curie constant in this system.
引用
收藏
页码:57 / 69
页数:13
相关论文
共 20 条
[1]   SYNTHESIS AND PROCESSING CHARACTERISTICS OF BA0.65SR0.35TIO3 POWDERS FROM CATECHOLATE PRECURSORS [J].
ALI, NJ ;
MILNE, SJ .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1993, 76 (09) :2321-2326
[2]  
[Anonymous], 1993, FERROELECTRIC CRYSTA
[3]  
BABBIT RW, 1992, MICROWAVE J JUN, P63
[4]   PREPARATION, MORPHOLOGY AND X-RAY-DIFFRACTION STUDIES ON BARIUM STRONTIUM-TITANATE SINGLE-CRYSTALS [J].
BALAKUMAR, S ;
ILANGOVAN, R ;
MOORTHY, SG ;
SUBRAMANIAN, C .
MATERIALS RESEARCH BULLETIN, 1995, 30 (07) :897-907
[5]   DIFFUSED PHASE-TRANSITIONS IN BAXSR1-XTIO3 SINGLE-CRYSTALS [J].
BENGUIGUI, L ;
BETHE, K .
JOURNAL OF APPLIED PHYSICS, 1976, 47 (07) :2787-2791
[6]  
BHALLA AS, 1998, DARPA FAME WORKSH HE
[7]  
Feigelson R. S., 1988, MRS BULL, V13, P47, DOI [10.1557/S0883769400064198, DOI 10.1557/S0883769400064198]
[8]  
FIELDING JT, 1993, THESIS PENN STATE U
[9]   Growth and properties of Ba0.9Sr0.1TiO3 single crystal fibers [J].
Garcia, D ;
Guo, R ;
Bhalla, AS .
MATERIALS LETTERS, 2000, 42 (1-2) :136-141
[10]   BA(MG1/3TA2/3)O3 SINGLE-CRYSTAL FIBER GROWN BY THE LASER-HEATED PEDESTAL GROWTH TECHNIQUE [J].
GUO, R ;
BHALLA, AS ;
CROSS, LE .
JOURNAL OF APPLIED PHYSICS, 1994, 75 (09) :4704-4708