A new PbTiO3-type giant tetragonal compound for piezoelectric materials

February 23, 2016
A new PbTiO3-type giant tetragonal compound for piezoelectric materials
Crystal structure of Bi2ZnTiO6

The solid solution consisting of PbZrO3 and PbTiO3, P(Zr,Ti)O3 (PZT) is the most widely used piezoelectric material due to its excellent piezoelectric properties at morphotropic phase boundaries (MPB) between rhombohedral and tetragonal structures.

There is growing demand for a replacement to PZT because it contains lead-a toxic material. For this purpose, the development of novel lead-free rhombohedral and/or tetragonal polar compounds is crucial.

Now, Yu Runze, Hajime Hojo, Masaki Azuma and colleagues at Tokyo Institute of Technology, and colleagues at Chuo University, and the Japan Atomic Energy Agency have discovered a new PbTiO3-type giant tetragonal compound with the chemical formula Bi2ZnTiO6.

Polycrystalline samples of Bi2ZnVO6 were prepared by high-pressure synthesis at 9 GPa and 1100 oC and crystal structures were investigated by synchrotron X-ray diffraction and .

Analysis revealed that Bi2ZnVO6 has a giant tetragonal distortion of c/a = 1.26 and an estimated electrical ionic polarization of 126 μC/cm2. This value of the spontaneous polarization is the largest among PbTiO3-type perovskite compounds.

This polar compound with a large tetragonal distortion is a promising candidate for producing high performance lead-free solid solutions with MPB.

Explore further: Study reveals missing boundary in PZT phase diagram

More information: Runze Yu et al. New PbTiO -Type Giant Tetragonal Compound Bi ZnVO and Its Stability under Pressure , Chemistry of Materials (2015). DOI: 10.1021/cm504133e

Related Stories

Study reveals missing boundary in PZT phase diagram

November 3, 2014

(Phys.org) —Piezoelectric materials, which produce electricity in response to mechanical stress, account for a $12 billion global industry that is projected to grow at a rate of 13.2% per year, according to a recent report ...

Researchers take the lead out of piezoelectrics

November 13, 2009

There is good news for the global effort to reduce the amount of lead in the environment and for the growing array of technologies that rely upon the piezoelectric effect. A lead-free alternative to the current crop of piezoelectric ...

Linking superconductivity and structure

May 27, 2015

Superconductivity is a rare physical state in which matter is able to conduct electricity—maintain a flow of electrons—without any resistance. It can only be found in certain materials, and even then it can only be achieved ...

Lead-free piezoelectric materials of the future

September 14, 2010

Piezoelectric materials have fantastic properties: squeeze them and they generate an electrical field. And vice-versa, they contract or expand when jolted with an electrical pulse. With a name derived from the Greek word ...

Recommended for you

ATLAS observes direct evidence of light-by-light scattering

August 15, 2017

Physicists from the ATLAS experiment at CERN have found the first direct evidence of high energy light-by-light scattering, a very rare process in which two photons – particles of light – interact and change direction. ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.