Title :
Microwave dielectric properties of Ca (Nb2/3Li1/3)xTi1−xO3−δ (CNLTOX)
Author :
Costa, A. D S Bruno ; Costa, R.C.S. ; de O Amarante, F.W. ; Fernandes, T.S.M. ; Silva, M. A S da ; Sombra, A.S.B. ; Saraiva, G.D.
Author_Institution :
Univ. Fed. do Ceara - UFC, Fortaleza, Brazil
fDate :
Oct. 29 2011-Nov. 1 2011
Abstract :
Modified CaTiO3 (CTO) ceramics were prepared by the conventional solid-state method. The samples belong to the Pbnm spatial group, showing an orthorhombic structure. The microwave dielectric properties of the Ca[(Li1/3Nb2/3)xTi1-x]O3-δ for ball-milled samples with ratio of 2.4 balls/g, which were calcinated at 900°C (during 5h) and sintered at 1000°C (during 3h) were investigated. The dielectric permittivity decreased with the decreasing of titanium amount. A decrease in the temperature coefficient in resonant frequency (τf) was observed with the increase of the X value.
Keywords :
ball milling; calcination; calcium compounds; lithium compounds; microwave materials; niobium compounds; permittivity; piezoceramics; sintering; CNLTOX; CTO ceramics; Ca(Nb0.67Li0.33)xTi1-xO3-δ; ball-milled samples; calcination; dielectric permittivity; microwave dielectric properties; orthorhombic structure; sintering; solid-state method; spatial group; temperature 1000 degC; temperature 900 degC; time 3 h; time 5 h; Ceramics; Dielectrics; Microwave communication; Microwave measurements; Temperature; calcium titanate; orthorhombic structure; permitivity; porosity; temperature coeficient-component;
Conference_Titel :
Microwave & Optoelectronics Conference (IMOC), 2011 SBMO/IEEE MTT-S International
Conference_Location :
Natal
Print_ISBN :
978-1-4577-1662-1
DOI :
10.1109/IMOC.2011.6169266
