Dr. Joshua Robbins Profile

Dr. Joshua Robbins

at Sandia National Labs

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 6 April 2007 Paper

Microstructural modeling of ferroic switching and phase transitions in PZT

Joshua Robbins, Tariq Khraishi, Pavel Chaplya

Proceedings Volume 6526, 652607 (2007) https://doi.org/10.1117/12.715159

KEYWORDS: Ferroelectric materials, Crystals, Switching, Polarization, Finite element methods, Protactinium, Solids, Interfaces, 3D modeling, Ceramics

Read Abstract +

Niobium doped Lead Zirconate Titanate (PZT) with a Zr/Ti ratio of 95/5 (i.e., PZT 95/5-2Nb) is a ferroelectric with a rhombohedral structure at room temperature. A crystal (or a subdomain within a crystal) exhibits a spontaneous polarization in any one of eight crystallographically equivalent directions. Such a material becomes polarized when subjected to a large electric field. When the electric field is removed, a remanent polarization remains and a bound charge is stored. A displacive phase transition from a rhombohedral ferroelectric phase to an orthorhombic anti-ferroelectric phase can be induced with the application of a mechanical load. When this occurs, the material becomes depoled and the bound charge is released. The polycrystalline character of PZT 95/5-2Nb leads to highly non-uniform fields at the grain scale. These local fields lead to very complex material behavior during mechanical depoling that has important implications to device design and performance. This paper presents a microstructurally based numerical model that describes the 3D non-linear behavior of ferroelectric ceramics. The model resolves the structure of polycrystals directly in the topology of the problem domain and uses the extended finite element method (X-FEM) to solve the governing equations of electromechanics. The material response is computed from anisotropic single crystal constants and the volume fractions of the various polarization variants (i.e., three variants for rhombohedral anti-ferroelectric and eight for rhomobohedral ferroelectric ceramic). Evolution of the variant volume fractions is governed by the minimization of internally stored energy and accounts for ferroelectric and ferroelastic domain switching and phase transitions in response to the applied loads. The developed model is used to examine hydrostatic depoling in PZT 95/5-2Nb.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years