Title :
Structure and dielectric properties of Na and Ta doped CaCu3Ti4O12
Author :
Shtonda, O. ; Loboda, S. ; Bogomolov, A.
Author_Institution :
Donetsk Nat. Univ., Donetsk, Ukraine
Abstract :
New ceramic compositions based on Na and Ta doped CaCu3Ti4O12 (CCTO) solid solutions were obtained. The synthesis conditions, parameters of crystal structure and low frequency dielectric properties depending on Na and Ta concentrations were investigated. The solid solutions were obtained by substitution of Ca and Ti in the CCTO structure with Na and Ta, respectively, according to the formula Ca1-xNaxCu3Ti4-xTaxO12. The substitution scheme occurs in a whole range of x from 0 to 1. The sintering temperature of Na and Ta doped CCTO ceramics with 90-95% of theoretical density is lower than of undoped CCTO. 1 kHz dielectric permittivity of Ca1-xNaxCu3Ti4-xTaxO12 ceramics depends on x and varies from 2600 to 9700. Dielectric losses tangent is around 0.1.
Keywords :
calcium compounds; ceramics; copper compounds; crystal growth; crystal structure; dielectric losses; permittivity; sintering; sodium compounds; tantalum compounds; titanium compounds; Ca1-xNaxCu3Ti4-xTaxO12; ceramic composition; crystal structure; dielectric losses; dielectric permittivity; dielectric properties; sintering temperature; solid solution; structural properties; theoretical density; Atomic clocks; Dielectrics; Educational institutions; Frequency synthesizers; Lead; Particle beam optics; Periodic structures; Na and Ta doped CCTO; dielectric properties; high dielectric permittivity; solid solutions;
Conference_Titel :
Oxide Materials for Electronic Engineering (OMEE), 2014 IEEE International Conference on
Conference_Location :
Lviv
Print_ISBN :
978-1-4799-5960-0
DOI :
10.1109/OMEE.2014.6912333
