Crystallographic orientation dependence of the dielectric constant in polymorphic BaNb2O6 thin films deposited by laser ablation

Dong-Wan Kim, K. S. Hong, C. H. Kim, K. Char

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Well-crystallized barium metaniobate (BaNb2O6) thin films were fabricated on fused quartz substrates by pulsed laser deposition. The influence of substrate temperature and oxygen pressure on the crystal structure and preferred orientation were studied to understand the growth mechanism of BaNb2O6 thin films. The films formed at 600°C at an oxygen pressure of 100 mTorr exhibited predominantly the orthorhombic (040) orientation, and turned to the orthorhombic (230) orientation at 800°C. It was found that (220)-oriented hexagonal thin films were formed at 600°C at an oxygen pressure less than 50 mTorr. The dielectric constant of the BaNb 2O6 thin films was measured by scanning microwave microscopy (SMM). Preferentially (230)-oriented orthorhombic and (220)-oriented hexagonal BaNb2O6 thin films were shown to have significantly enhanced dielectric constants of 47.8 and 56.7, respectively. This could be attributed to the dependence of the dielectric constant on crystallographic orientation.

Original languageEnglish
Pages (from-to)677-680
Number of pages4
JournalApplied Physics A: Materials Science and Processing
Volume79
Issue number3
DOIs
Publication statusPublished - 2004 Aug 1
Externally publishedYes

Fingerprint

Laser ablation
laser ablation
Permittivity
permittivity
Thin films
thin films
Oxygen
oxygen
Quartz
Substrates
Barium
Pulsed laser deposition
Crystal orientation
pulsed laser deposition
barium
Microscopic examination
quartz
Crystal structure
Microwaves
microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Crystallographic orientation dependence of the dielectric constant in polymorphic BaNb2O6 thin films deposited by laser ablation. / Kim, Dong-Wan; Hong, K. S.; Kim, C. H.; Char, K.

In: Applied Physics A: Materials Science and Processing, Vol. 79, No. 3, 01.08.2004, p. 677-680.

Research output: Contribution to journalArticle

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AB - Well-crystallized barium metaniobate (BaNb2O6) thin films were fabricated on fused quartz substrates by pulsed laser deposition. The influence of substrate temperature and oxygen pressure on the crystal structure and preferred orientation were studied to understand the growth mechanism of BaNb2O6 thin films. The films formed at 600°C at an oxygen pressure of 100 mTorr exhibited predominantly the orthorhombic (040) orientation, and turned to the orthorhombic (230) orientation at 800°C. It was found that (220)-oriented hexagonal thin films were formed at 600°C at an oxygen pressure less than 50 mTorr. The dielectric constant of the BaNb 2O6 thin films was measured by scanning microwave microscopy (SMM). Preferentially (230)-oriented orthorhombic and (220)-oriented hexagonal BaNb2O6 thin films were shown to have significantly enhanced dielectric constants of 47.8 and 56.7, respectively. This could be attributed to the dependence of the dielectric constant on crystallographic orientation.

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