Structural, ultraviolet-shielding, dielectric and ferroelectric properties of Ba1-xSrxTiO3 (x=0.35) thin films prepared by sol-gel method in presence of pyrrole

Pramod K. Sharma, Gary Lynn Messing, Dinesh Kumar Agrawal

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Barium-strontium titanate thin films were prepared by the sol-gel (SG) method. The Barium-strontium titanate sol was derived from organometallic compounds and modified by pyrrole. The films derived from pyrrole were uniform and crack free. The structural evolution of the film was investigated by X-ray diffraction (XRD). The thickness of the film increased by twofold (645 nm) when pyrrole concentration was increased from 0 to 1.5 molar ratio with respect to titanium. Barium-strontium titanate films showed excellent UV absorption and transparency in the visible region. The direct band gap of barium-strontium titanate films was determined from the curve of absorption coefficient (α) vs. hν and was found to be 3.9 eV. The refractive index of the 500-nm-thick annealed film was 2.5. The dielectric constant and dielectric loss values of modified films annealed at 700 °C were 680 and 0.05, respectively, measured at 1 MHz. The dielectric constant increases and dielectric loss decreases, with increasing pyrrole concentration. The dielectric properties were also investigated with annealing temperature of barium-strontium titanate films. The grain size of the films varied with annealing temperature. The remanent polarization (Pr) and coercive field (Ec) of films made from the sol-gel method with pyrrole, were found to have average value of ≈ 2.2 μC/cm2 and ≈ 21 kV/cm, respectively.

Original languageEnglish (US)
Pages (from-to)204-211
Number of pages8
JournalThin Solid Films
Volume491
Issue number1-2
DOIs
StatePublished - Nov 22 2005

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Pyrroles
pyrroles
Shielding
Sol-gel process
Ferroelectric materials
shielding
dielectric properties
Barium strontium titanate
gels
Thin films
strontium
thin films
barium
Dielectric losses
dielectric loss
Permittivity
Organometallic Compounds
Annealing
permittivity
organometallic compounds

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Structural, ultraviolet-shielding, dielectric and ferroelectric properties of Ba1-xSrxTiO3 (x=0.35) thin films prepared by sol-gel method in presence of pyrrole",
abstract = "Barium-strontium titanate thin films were prepared by the sol-gel (SG) method. The Barium-strontium titanate sol was derived from organometallic compounds and modified by pyrrole. The films derived from pyrrole were uniform and crack free. The structural evolution of the film was investigated by X-ray diffraction (XRD). The thickness of the film increased by twofold (645 nm) when pyrrole concentration was increased from 0 to 1.5 molar ratio with respect to titanium. Barium-strontium titanate films showed excellent UV absorption and transparency in the visible region. The direct band gap of barium-strontium titanate films was determined from the curve of absorption coefficient (α) vs. hν and was found to be 3.9 eV. The refractive index of the 500-nm-thick annealed film was 2.5. The dielectric constant and dielectric loss values of modified films annealed at 700 °C were 680 and 0.05, respectively, measured at 1 MHz. The dielectric constant increases and dielectric loss decreases, with increasing pyrrole concentration. The dielectric properties were also investigated with annealing temperature of barium-strontium titanate films. The grain size of the films varied with annealing temperature. The remanent polarization (Pr) and coercive field (Ec) of films made from the sol-gel method with pyrrole, were found to have average value of ≈ 2.2 μC/cm2 and ≈ 21 kV/cm, respectively.",
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Structural, ultraviolet-shielding, dielectric and ferroelectric properties of Ba1-xSrxTiO3 (x=0.35) thin films prepared by sol-gel method in presence of pyrrole. / Sharma, Pramod K.; Messing, Gary Lynn; Agrawal, Dinesh Kumar.

In: Thin Solid Films, Vol. 491, No. 1-2, 22.11.2005, p. 204-211.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Structural, ultraviolet-shielding, dielectric and ferroelectric properties of Ba1-xSrxTiO3 (x=0.35) thin films prepared by sol-gel method in presence of pyrrole

AU - Sharma, Pramod K.

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AU - Agrawal, Dinesh Kumar

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AB - Barium-strontium titanate thin films were prepared by the sol-gel (SG) method. The Barium-strontium titanate sol was derived from organometallic compounds and modified by pyrrole. The films derived from pyrrole were uniform and crack free. The structural evolution of the film was investigated by X-ray diffraction (XRD). The thickness of the film increased by twofold (645 nm) when pyrrole concentration was increased from 0 to 1.5 molar ratio with respect to titanium. Barium-strontium titanate films showed excellent UV absorption and transparency in the visible region. The direct band gap of barium-strontium titanate films was determined from the curve of absorption coefficient (α) vs. hν and was found to be 3.9 eV. The refractive index of the 500-nm-thick annealed film was 2.5. The dielectric constant and dielectric loss values of modified films annealed at 700 °C were 680 and 0.05, respectively, measured at 1 MHz. The dielectric constant increases and dielectric loss decreases, with increasing pyrrole concentration. The dielectric properties were also investigated with annealing temperature of barium-strontium titanate films. The grain size of the films varied with annealing temperature. The remanent polarization (Pr) and coercive field (Ec) of films made from the sol-gel method with pyrrole, were found to have average value of ≈ 2.2 μC/cm2 and ≈ 21 kV/cm, respectively.

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