Ferroelectric lead magnesium niobate-lead titanate single crystals for ultrasonic hydrophone applications

S. T. Lau, Kwok Ho Lam, H. L.W. Chan, C. L. Choy, H. S. Luo, Q. R. Yin, Z. W. Yin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

Abstract

Ferroelectric lead magnesium niobate-lead titanate (PMN-PT) single crystals with a composition around the rhombohedral-tetragonal morphotropic phase boundary (65mol% of PMN) were used to fabricate single-element needle-type hydrophones for measuring the spatial and temporal characteristics of medical ultrasonic transducers. PMN-PT single crystal was grown by a modified Bridgman method. Discs (0.5mm thick) with normal along the 〈001〉 direction were cut and then poled by a dc field in the thickness direction. The single crystal has a high relative permittivity (εr∼ 4000) making it appropriate for small area hydrophone applications. Single-element needle-type hydrophones with this material as the sensing element have been fabricated and characterized. The hydrophones have flat frequency response and good receiving sensitivity over certain frequency range in the megahertz region.
Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume111
Issue number1
DOIs
Publication statusPublished - 15 Aug 2004

Keywords

  • Hydrophone
  • Piezoelectric
  • PMN-PT single crystal
  • Relaxor ferroelectrics

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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