TY - JOUR
T1 - Correlation of microwave dielectric properties and crystallinity for pulsed laser deposited Bi2(Zn1/3 Nb2/3)2O7 thin films
AU - Cheng, Hsiu Fung
AU - Chen, Yi Chun
AU - Liu, Hsiang Lin
AU - Hwa, Luu Gen
AU - Lin, I. Nan
N1 - Funding Information:
Financial support of National Science Council, R.O.C. through the project no. NSC-90-2112-M-003-028 is gratefully acknowledged by the authors.
PY - 2004/6
Y1 - 2004/6
N2 - Correlation of microwave dielectric properties of Bi2(Zn1/3Nb2/3)2 O7, BiZN thin films, which were pulsed laser deposited on Si(100) substrates, with crystallinity of BiZN phase was examined using Fourier Transform Infrared (FTIR) spectroscopy. Rigid-ion model analysis from FTIR spectra of the films reveals that the magnitude of effective charge for oxygen increases with improved crystallinity for BiZN films. In contrast, lattice vibrational modes of the films, which occur at ω 01=341 cm-1, ω02=522 cm-1, and ω 03=612 cm-1, insignificantly change with films' crystallinity. It implies that better crystallinity will induce higher polarization in BO6 oxygen octahedral, which improves microwave properties of pyrochlore materials. The dielectric constant measured at 200 cm-1 increases with substrate temperature used for depositing BiZN films, inferring that dielectric properties in low frequency regime of far infrared region are predominantly contributed by ionic polarization, and are strongly related to effective charges of oxygen species.
AB - Correlation of microwave dielectric properties of Bi2(Zn1/3Nb2/3)2 O7, BiZN thin films, which were pulsed laser deposited on Si(100) substrates, with crystallinity of BiZN phase was examined using Fourier Transform Infrared (FTIR) spectroscopy. Rigid-ion model analysis from FTIR spectra of the films reveals that the magnitude of effective charge for oxygen increases with improved crystallinity for BiZN films. In contrast, lattice vibrational modes of the films, which occur at ω 01=341 cm-1, ω02=522 cm-1, and ω 03=612 cm-1, insignificantly change with films' crystallinity. It implies that better crystallinity will induce higher polarization in BO6 oxygen octahedral, which improves microwave properties of pyrochlore materials. The dielectric constant measured at 200 cm-1 increases with substrate temperature used for depositing BiZN films, inferring that dielectric properties in low frequency regime of far infrared region are predominantly contributed by ionic polarization, and are strongly related to effective charges of oxygen species.
KW - Dielectric properties
KW - Effective charge
KW - FTIR
KW - Microwave dielectric thin films
KW - Pulsed laser deposition
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U2 - 10.1016/S0955-2219(03)00494-1
DO - 10.1016/S0955-2219(03)00494-1
M3 - Article
AN - SCOPUS:0942301886
SN - 0955-2219
VL - 24
SP - 1791
EP - 1794
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 6
ER -