%0 Journal Article %1 WOS:000265886100070 %A Costa, R C S %A Costa, Bruno A D S %A Freire, F N A %A Santos, M R P %A Almeida, J S %A Sohn, R S T M %A Sasaki, J M %A Sombra, A S B %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %D 2009 %I ELSEVIER SCIENCE BV %J PHYSICA B-CONDENSED MATTER %K (cro); Microwave ceramics} titanate {Calcium %N 8-11 %P 1409-1414 %R 10.1016/j.physb.2008.12.037 %T Structural properties of CaTi1-x(Nb2/3Li2/3)(x)O3-delta (CNLTO) and CaTi1-x(Nb(1/2)Ln(1/2))(x)O-3 (Ln = Fe (CNFTO), Bi (CNBTO)), modified dielectric ceramics for microwave applications %V 404 %X This paper presents an investigation of the structural characteristics of Nb1/2Bi1/2 (CNBTO), Nb1/2Fe1/2 (CNFTO) and Nb2/3Li1/3 (CNLTO) substitution into the B-site of calcium titanate ceramics. The modified CaTiO3 (CTO) ceramics were prepared by the conventional solid-state method. The compounds were investigated, by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDXS). The X-ray analysis shows that all samples have an orthorhombic structure. The refinement analysis of all samples were also performed and discussed in this paper. For all studied samples, a Raman mode at 805 cm(-1) was detected and its intensity increases as the substitution increases. The dielectric permittivity and loss at microwave frequencies (MW) were investigated. The CNLTO phase, present the highest dielectric constant (k = 35.8) at 3.9 GHz with loss (tg alpha = 7 x 10(-3)). The lowest value of k = 25.7 (f = 4.8 GHz) and tg alpha = 3 X 10(-3), Was obtained for the CNFTO phase. These measurements confirm the possible use of such material for microwave devices like dielectric resonator antennas. (C) 2009 Elsevier B.V. All rights reserved.

@article{WOS:000265886100070, abstract = {This paper presents an investigation of the structural characteristics of Nb1/2Bi1/2 (CNBTO), Nb1/2Fe1/2 (CNFTO) and Nb2/3Li1/3 (CNLTO) substitution into the B-site of calcium titanate ceramics. The modified CaTiO3 (CTO) ceramics were prepared by the conventional solid-state method. The compounds were investigated, by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDXS). The X-ray analysis shows that all samples have an orthorhombic structure. The refinement analysis of all samples were also performed and discussed in this paper. For all studied samples, a Raman mode at 805 cm(-1) was detected and its intensity increases as the substitution increases. The dielectric permittivity and loss at microwave frequencies (MW) were investigated. The CNLTO phase, present the highest dielectric constant (k = 35.8) at 3.9 GHz with loss (tg alpha = 7 x 10(-3)). The lowest value of k = 25.7 (f = 4.8 GHz) and tg alpha = 3 X 10(-3), Was obtained for the CNFTO phase. These measurements confirm the possible use of such material for microwave devices like dielectric resonator antennas. (C) 2009 Elsevier B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, author = {Costa, R C S and Costa, Bruno A D S and Freire, F N A and Santos, M R P and Almeida, J S and Sohn, R S T M and Sasaki, J M and Sombra, A S B}, biburl = {https://www.bibsonomy.org/bibtex/2f4d2dbb23b0d53e006bf9f946d9cc827/ppgfis_ufc_br}, doi = {10.1016/j.physb.2008.12.037}, interhash = {dc8e31558f34c6e9c6c858da2e712495}, intrahash = {f4d2dbb23b0d53e006bf9f946d9cc827}, issn = {0921-4526}, journal = {PHYSICA B-CONDENSED MATTER}, keywords = {(cro); Microwave ceramics} titanate {Calcium}, number = {8-11}, pages = {1409-1414}, publisher = {ELSEVIER SCIENCE BV}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Structural properties of CaTi1-x(Nb2/3Li2/3)(x)O3-delta (CNLTO) and CaTi1-x(Nb(1/2)Ln(1/2))(x)O-3 (Ln = Fe (CNFTO), Bi (CNBTO)), modified dielectric ceramics for microwave applications}, tppubtype = {article}, volume = 404, year = 2009 }