Barium Titanate (BaTiO3) - Properties and Applications

Background

The chemical formula for Barium Titanate is BaTiO3. As a powder it is white to grey in colour and has a perovskite structure.

It is soluble in many acids including sulfuric, hydrochloric and hydrofluoric acids. It is insoluble in alkalis and water.

In the pure form it is an electrical insulator. However, when doped with small amounts of metals, most notably scandium, yttrium, neodymium, samarium etc it becomes semiconducting.

As a semiconductor it exhibits positive temperature of co-efficient of resistivity (PTCR) properties in the polycrystalline form. This means at a certain temperature, called the Curie temperature, the material will exhibit an increase in resistivity, the increase typically being several orders of magnitude. The Curie temperature can to some extent be controlled by the dopant.

At the Curie temperature, barium titanate undergoes a phase change from tetrahedral to cubic. It has also been reported that single crystals of barium titanate exhibit negative temperature co-efficient of resistivity (NTCR) properties.

Barium titanate also exhibits ferroelectric properties and is an excellent photorefractive material.

Applications

Due to its PTCR properties, barium titanate is most often found used as a thermistor e.g. in thermal switches.

Key Properties

Property Value
Density ( g.cm-3 ) 6.02
Melting Point (°C) 1650
Young’s Modulus (GPa) 67
Hardness (Mohs) 5

Source: AZoM.com.

 

Comments

  1. Nafeesa Ch Nafeesa Ch United States says:

    How it is applicable from the point of view of chemistry?

  2. Sunil Kawade Sunil Kawade India says:

    properties of ferroelectric material

  3. sohail Mansoor sohail Mansoor Islamic Republic of Pakistan says:

    What are the uses of barium titanate in Metallurgy

  4. KAJOL MAHESHWARI KAJOL MAHESHWARI India says:

    Dielectric constant of Barium Titanate??

  5. Paul Steffen Paul Steffen United States says:

    Our lab users would like to anneal electronic and semiconductor microdevices with Barium Titanate substrates and layers in our Rapid Thermal Annealing (RTA) system with nitrogen or argon gas at atmospheric pressure. At what temperature will the Barium Titanate decompose or evaporate and contaminate the system?

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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