Piezoelectric materials and methods of property control

Patent metadata

Field	Value
Publication number	US-9728708-B2
Application number	US-201214352938-A
Country	US
Kind code	B2
Filing date	Oct 18, 2012
Priority date	Oct 18, 2011
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Among other things, piezoelectric materials and methods of their manufacture are described; particularly methods of forming regions of varying crystal structure within a relaxor piezoelectric substrate. Such methods may including heating the piezoelectric substrate above the transition temperature and below the Curie temperature such that a first phase transition occurs to a first crystal structure; rapidly cooling the piezoelectric substrate below the transition temperature at a cooling rate that is sufficiently high for the first crystal structure to persist; and applying an electric field through one or more selected regions of the piezoelectric substrate, such that within the one or more selected regions, a second phase transition occurs and results in a second crystal structure.

First claim

The invention claimed is:

1. A piezoelectric device comprising:
a piezoelectric substrate having a relaxor composition, said piezoelectric substrate comprising:
an array of first piezoelectric regions; and
an array of second piezoelectric regions, wherein each second region is laterally adjacent to at least one respective first piezoelectric region; and

an array of electrodes formed adjacent to a first surface of said piezoelectric substrate, each electrode of said array of…

Assignees

• Univ Dalhousie

Inventors

• Garland Philip P
• Adamson Robert B A
• Bezanson Andre B
• Brown Jeremy A

Classifications

• C30B29/32

  Chemistry & Metallurgy · mapped topic

• C30B33/02

  Chemistry & Metallurgy · mapped topic

• C30B33/04 Primary

  Chemistry & Metallurgy · mapped topic

• B06B1/0622

  Operations & Transport · mapped topic

• Y10T428/24983

  Cross-Sectional Technologies · mapped topic