Strontium Titanate (SrTiO3) - Properties and Applications


Strontium titanate (SrTiO3) has a perovskite structure like CaTiO3, the mineral from which the name was derived. At room temperature it exists in thew cubic form, but transforms into the tetragonal structure at temperatures less than 105K.

At very low temperatures, strontium titanate exhibits piezoelectric and superconducting characteristics.

Strontium titanate also exhibits a very large dielectric constant.

Key Properties

Property Value
Density (g.cm3) 5.12
Melting Point (°C) 2080
Mohs Hardness 6
Dielectric Constant 300
Thermal Conductivity (W/m.K) 12
Co-Efficient of Thermal Expansion (/°C) 9.4x10-6
Refractive Index 2.31-2.38



Strontium titanate finds applications in varistors, while thin strontium titanate films are used in tunable HTS (high temperature superconducting) microwave filters.

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  1. Raquel Acda Raquel Acda Philippines says:

    Will SrTiO3 under room temp ( 20- 30 deg C ) still be exhibiting  very high thermal conductivity by itself?

  2. Raquel Acda Raquel Acda Philippines says:

    How do we test for superconductivity of metals and compounds under very low temp?
    What are the possible applications of these? and can it be doped with ordinary solar panel?

  3. Jim Thomson Jim Thomson Canada says:

    Can this material be machined on a CNC vertical mill?
    We've been asked to try to make some small washers (1/2" od x 5/16" id x 5/16" thick) and I don't know how to proceed. Any suggestions (on cutter, speeds)?

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