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Doping Modification of Lead-free Capacitor Ceramics

Author: XuShiGuo
Tutor: QuYuanFang
School: Tianjin University
Course: Materials Science
Keywords: Lead-free Perovskite structure Doping modification Dielectric properties
CLC: TQ174.1
Type: PhD thesis
Year: 2011
Downloads: 54
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This article Lead capacitor ceramic dielectric material having a perovskite structure (BaSr) (SnTi) O 3 for the study, by doping its modified analysis crystals doped material after structure, morphology, and dielectric properties, to explore a ceramic dielectric material having a high dielectric constant, low dielectric constant temperature change rate. Main contents include: Research the Bi 3 Na and Mg 2 (Ba 0.68 Sr 0.32 ) (Ti 0.99 Sn 0.01 ) O 3 ceramic dielectric properties. The Bi 3 doped ceramic sample Curie peak (the ε max reduces significantly increased dielectric loss. Containing Bi 3 (Ba 0.68 Sr 0.311 Bi 0.006 ) (Ti 0.99 Sn 0.01 ) O after 3 ceramic the Mg 2 and Na doping modification: Mg 2 doped ceramic specimen referral significantly reduce the dielectric constant, the dielectric constant temperature coefficient is improved; Na doped ceramic sample rhombohedral lattice distortion, the the Curie peaks (ε max reduce , dielectric loss has been markedly improved. Subsequently, the the containing of Bi 3 and Na the (Ba0.677Sr 0.311 of Bi 0.006 ) Na 0.006 (Ti 0.99 the Sn 0.01 ) the O 3 ceramic Mg 2 doping modification, the study found: With the of Mg 2 content increased from 0 to 2.0mol%, the ceramic specimen Curie peak (ε max reduce Curie temperature (Tc) is moved towards low; When Mg 2 content of greater than 2.0mol%, the the ceramic specimens Curie peak (ε max is only slightly reduced, door inside temperature (Tc) is almost no movement; When Mg 2 content of greater than 0.5 mol%, the ceramic specimens rhombohedral lattice distortion disappears, so that the dielectric loss of the low-temperature region is improved. explore Y 2 O 3 -doped and the second doped (Ba 0.670 Sr 0.311 ) Bi 0.006 Mg 0.010 ) (Ti 0.99 Sn 0.01 ) O 3 ceramic dielectric properties two doping ways are the dielectric constant of the ceramic sample Curie peak (ε max increases, the dielectric constant of the ceramic sample showed significant diffuse phase transition characteristics. two Doping a certain degree of the influence of the dielectric loss of the ceramic specimens different: Y 2 O 3 a doping modification, the ceramic sample in the high temperature the District of dielectric loss and Y of 2 O 3 doped amount related; Y 2 O 3 secondary doped heteroaryl modified when the dielectric loss of the ceramic sample in the high temperature zone to be significantly improved, and does not vary with Y change O 3 content changes, and then, by fractional Synthesis of (Ba 0.68 Sr 0.311 Bi 0.006 ) (Ti 0.99 Sn 0.01 ) O 3 - (Bi 0.5 Na 0.5 ) TiO 3 ceramics. ceramic sample no obvious permittivity Curie peak (ε max , is a mixture of: a variety of different compounds from the Curie temperature (Tc) assembly. ceramic sample in the -25 ℃ 85 ° C temperature range, preferably the dielectric constant of the temperature change rate (TCC). to 80 wt% (BA 0.68 Sr Bi 0.311 0.006 < / sub>) (Ti 0.99 Sn 0.01 ) O 3 - 20wt.% (Bi 0.5 Na 0.5 ) TiO 3 ceramic specimens the Y- 2 O 3 secondary doping modification, the study found that: Y < sub> 2 O 3 doping amount of 0.5mol%, the ceramic specimens exhibit a high dielectric constant, about 3000 or so.

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