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

Research output: Contribution to journalArticlepeer-review

5 Scopus Citations


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
StatePublished - 2003

NREL Publication Number

  • NREL/JA-520-36016


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


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