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Conservation of Permittivity and Tunability of Ferroelectrics Over Temperature

  • A. Prudan
  • , A. Kozyrev
  • , A. Zemtsov
  • , V. Osadchy
  • , D. Ginley
  • , T. Kaydanova
  • , J. D. Perkins
  • , J. Alleman
  • , L. Sengupta
  • , L. Chiu
  • , X. Zhang
  • St. Petersburg State Electrotechnical University
  • National Renewable Energy Laboratory
  • Paratek Microwave, Inc.

Research output: Contribution to journalArticlepeer-review

5 Scopus Citations

Abstract

The existence of an intersection point of electric field strength dependencies of permittivity of ferroelectrics at different temperatures is theoretically described by Ginzburg-Devonshire (GD) theory and experimentally confirmed by studying (Ba 0.3Sr 0.7)TiO 3 (BSTO) and SrTiO 3 (STO) thin film varactors. GD analysis enables one to propose a way to improve the thermal stability of ferroelectric microwave devices. In particular, parameters of a L-band digital (0°/180°) phase-shifter fabricated from thick BSTO film varactors were stabilized in the temperature range T = (210-310) K by application of variable to DC control voltages.

Original languageAmerican English
Pages (from-to)1337-1345
Number of pages9
JournalIntegrated Ferroelectrics
Volume58
DOIs
StatePublished - 2003

NLR Publication Number

  • NREL/JA-520-36016

Keywords

  • Ferroelectric film
  • Permittivity
  • Phase shifter
  • Thermal stabilization
  • Tunability

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