Far-infrared, Raman spectroscopy, and microwave dielectric properties of la (Mg0.5 Ti (0.5-x) Snx) O3 ceramics

G. Santosh Babu; V. Subramanian; V. R.K. Murthy; I. Nan Lin; Chia Ta Chia; Hsiang Lin Liu

doi:10.1063/1.2778743

Far-infrared, Raman spectroscopy, and microwave dielectric properties of la (Mg_0.5 Ti _(0.5-x) Sn_x) O₃ ceramics

G. Santosh Babu, V. Subramanian^*, V. R.K. Murthy, I. Nan Lin, Chia Ta Chia, Hsiang Lin Liu

^*Corresponding author for this work

Department of Physics

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Abstract

La (Mg0.5 Ti (0.5-x) Snx) O3 perovskite ceramics with composition (x=0.0-0.5) are prepared by the solid state reaction method. The ceramics are characterized by x-ray diffraction, far-infrared reflectance, Raman spectroscopy, and microwave dielectric properties. The symmetry of ceramics is monoclinic with P 21 /n space group. Intrinsic dielectric constant and loss are estimated by fitting reflectance to the four-parameter semiquantum model. Transverse optic phonon mode strengths and average phonon damping are calculated. The modes corresponding to B -site ordering are identified in Raman spectra and the A1g mode of La (MgTi) 0.5 O3 is analyzed by assuming two merging modes. The variation of long-range order is correlated with full width half maximum of the A1g mode. Microwave measurements are carried out in the frequency range of 8-10 GHz. The dielectric constant (ε′) is found to gradually decrease from 28.4 to 19.7 with an increase in tin concentration, whereas the temperature coefficient of resonant frequency (τf) decreases from -68 to -84 ppm/°C. The product of the quality factor and resonant frequency (Q×f) obtained for La (MgTi) 0.5 O3 is 55,000 GHz, that decreases to 46,000 for x=0.25 composition and then increases to 63,000 GHz for La (MgSn) 0.5 O3.

Original language	English
Article number	064906
Journal	Journal of Applied Physics
Volume	102
Issue number	6
DOIs	https://doi.org/10.1063/1.2778743
Publication status	Published - 2007

ASJC Scopus subject areas

General Physics and Astronomy

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@article{23145eaa7acf485fb91024163a32cac5,

title = "Far-infrared, Raman spectroscopy, and microwave dielectric properties of la (Mg0.5 Ti (0.5-x) Snx) O3 ceramics",

abstract = "La (Mg0.5 Ti (0.5-x) Snx) O3 perovskite ceramics with composition (x=0.0-0.5) are prepared by the solid state reaction method. The ceramics are characterized by x-ray diffraction, far-infrared reflectance, Raman spectroscopy, and microwave dielectric properties. The symmetry of ceramics is monoclinic with P 21 /n space group. Intrinsic dielectric constant and loss are estimated by fitting reflectance to the four-parameter semiquantum model. Transverse optic phonon mode strengths and average phonon damping are calculated. The modes corresponding to B -site ordering are identified in Raman spectra and the A1g mode of La (MgTi) 0.5 O3 is analyzed by assuming two merging modes. The variation of long-range order is correlated with full width half maximum of the A1g mode. Microwave measurements are carried out in the frequency range of 8-10 GHz. The dielectric constant (ε′) is found to gradually decrease from 28.4 to 19.7 with an increase in tin concentration, whereas the temperature coefficient of resonant frequency (τf) decreases from -68 to -84 ppm/°C. The product of the quality factor and resonant frequency (Q×f) obtained for La (MgTi) 0.5 O3 is 55,000 GHz, that decreases to 46,000 for x=0.25 composition and then increases to 63,000 GHz for La (MgSn) 0.5 O3.",

author = "Babu, {G. Santosh} and V. Subramanian and Murthy, {V. R.K.} and Lin, {I. Nan} and Chia, {Chia Ta} and Liu, {Hsiang Lin}",

note = "Funding Information: One of the authors (G.S.B.), acknowledges the Council of Scientific and Industrial Research (CSIR), New Delhi, for providing the financial assistance in the form of Senior Research Fellowship. The authors would also like to thank Dr. A. N. Salak for the helpful discussions on IR analysis.",

year = "2007",

doi = "10.1063/1.2778743",

language = "English",

volume = "102",

journal = "Journal of Applied Physics",

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TY - JOUR

T1 - Far-infrared, Raman spectroscopy, and microwave dielectric properties of la (Mg0.5 Ti (0.5-x) Snx) O3 ceramics

AU - Babu, G. Santosh

AU - Subramanian, V.

AU - Murthy, V. R.K.

AU - Lin, I. Nan

AU - Chia, Chia Ta

AU - Liu, Hsiang Lin

N1 - Funding Information: One of the authors (G.S.B.), acknowledges the Council of Scientific and Industrial Research (CSIR), New Delhi, for providing the financial assistance in the form of Senior Research Fellowship. The authors would also like to thank Dr. A. N. Salak for the helpful discussions on IR analysis.

PY - 2007

Y1 - 2007

N2 - La (Mg0.5 Ti (0.5-x) Snx) O3 perovskite ceramics with composition (x=0.0-0.5) are prepared by the solid state reaction method. The ceramics are characterized by x-ray diffraction, far-infrared reflectance, Raman spectroscopy, and microwave dielectric properties. The symmetry of ceramics is monoclinic with P 21 /n space group. Intrinsic dielectric constant and loss are estimated by fitting reflectance to the four-parameter semiquantum model. Transverse optic phonon mode strengths and average phonon damping are calculated. The modes corresponding to B -site ordering are identified in Raman spectra and the A1g mode of La (MgTi) 0.5 O3 is analyzed by assuming two merging modes. The variation of long-range order is correlated with full width half maximum of the A1g mode. Microwave measurements are carried out in the frequency range of 8-10 GHz. The dielectric constant (ε′) is found to gradually decrease from 28.4 to 19.7 with an increase in tin concentration, whereas the temperature coefficient of resonant frequency (τf) decreases from -68 to -84 ppm/°C. The product of the quality factor and resonant frequency (Q×f) obtained for La (MgTi) 0.5 O3 is 55,000 GHz, that decreases to 46,000 for x=0.25 composition and then increases to 63,000 GHz for La (MgSn) 0.5 O3.

AB - La (Mg0.5 Ti (0.5-x) Snx) O3 perovskite ceramics with composition (x=0.0-0.5) are prepared by the solid state reaction method. The ceramics are characterized by x-ray diffraction, far-infrared reflectance, Raman spectroscopy, and microwave dielectric properties. The symmetry of ceramics is monoclinic with P 21 /n space group. Intrinsic dielectric constant and loss are estimated by fitting reflectance to the four-parameter semiquantum model. Transverse optic phonon mode strengths and average phonon damping are calculated. The modes corresponding to B -site ordering are identified in Raman spectra and the A1g mode of La (MgTi) 0.5 O3 is analyzed by assuming two merging modes. The variation of long-range order is correlated with full width half maximum of the A1g mode. Microwave measurements are carried out in the frequency range of 8-10 GHz. The dielectric constant (ε′) is found to gradually decrease from 28.4 to 19.7 with an increase in tin concentration, whereas the temperature coefficient of resonant frequency (τf) decreases from -68 to -84 ppm/°C. The product of the quality factor and resonant frequency (Q×f) obtained for La (MgTi) 0.5 O3 is 55,000 GHz, that decreases to 46,000 for x=0.25 composition and then increases to 63,000 GHz for La (MgSn) 0.5 O3.

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ER -

Far-infrared, Raman spectroscopy, and microwave dielectric properties of la (Mg_0.5 Ti _(0.5-x) Sn_x) O₃ ceramics

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