Module 1: Structure of Ceramics
  Structures based on HCP Packing of Ions
 


      1.10.5 Rutile Structure

  • Polymorph of titanium di-oxide or TiO2

  • Other forms are Anatase and Brookite.

  • It is formed by quasi-HCP packing of anions.

  • Half of the octahedral sites are filled by cations.

  • The resulting structure has a tetragonal crystal structure due to a slight distortion in the lattice.

  • Anisotropic diffusion properties of cations are found in TiO2.

  • Materials shows large and anisotropic refractive index and high birefringence.

  • TiO2 is often used as pigments and is non-toxic.

Figure 1.46 Structure of a layer of oxygen and Titanium in Rutile

 

Figure 1.47 Unit-cell of Rutile

 

Figure 1.48 Polyhedral model of Rutile