Abstract

We have synthesized stoichiometric Ba(Cd 1/3Ta 2/3)O 3 [BCT] (100) dielectric thin films on MgO (100) substrates using Pulsed Laser Deposition. Over 99% of the BCT film was found to be epitaxial [BCT (100) || MgO (100) and BCT (010) || MgO (010)] when grown with an elevated substrate temperature of 635°C, an enhanced oxygen pressure of 53 Pa and a Cd-enriched BCT target with a 1 mol BCT: 1.5 mol CdO composition. A dielectric constant of 32 was inferred from low-frequency capacitance measurements of a planar interdigital metal pattern. Analysis of ultra violet optical absorption results indicates that BCT has a bandgap of 4.9 eV; while the interference pattern in the visible range is consistent with a refractive index of 2.1. Temperature-dependent electrical measurements indicate that the BCT films have a room temperature conductivity of 3 × 10 - 12 Ω - 1 cm - 1 with a thermal activation energy of 0.7 eV. A mean particle size of ∼ 100 nm and a root mean square surface roughness of 5 to 6 nm were measured using Atomic Force Microscopy.

Original languageEnglish (US)
Pages (from-to)6153-6157
Number of pages5
JournalThin Solid Films
Volume520
Issue number19
DOIs
StatePublished - Jul 31 2012

Fingerprint

Thin films
thin films
electrical measurement
pulsed laser deposition
surface roughness
optical absorption
Capacitance measurement
Dielectric films
capacitance
atomic force microscopy
Substrates
permittivity
refractivity
Pulsed laser deposition
activation energy
low frequencies
interference
conductivity
Temperature
Light absorption

Keywords

  • Ba(Cd1/3Ta2/3)O3
  • Ba(Zn1/3Ta2/3)O3
  • Microwave dielectrics
  • Optical/electrical properties
  • Perovskite
  • Pulsed Laser Deposition

ASJC Scopus subject areas

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

Cite this

Growth and characterization of Ba(Cd 1/3Ta 2/3)O 3 thin films. / Liu, L. T.; Kopas, C.; Singh, Rakesh; Hanley, R. M.; Newman, Nathan.

In: Thin Solid Films, Vol. 520, No. 19, 31.07.2012, p. 6153-6157.

Research output: Contribution to journalArticle

Liu, L. T. ; Kopas, C. ; Singh, Rakesh ; Hanley, R. M. ; Newman, Nathan. / Growth and characterization of Ba(Cd 1/3Ta 2/3)O 3 thin films. In: Thin Solid Films. 2012 ; Vol. 520, No. 19. pp. 6153-6157.
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