Nickel(II) titanate

Structure

Nickel(II) titanate crystallizes at 600 °C and is stable at room temperature and normal pressure in an ilmenite structure with rhombohedral R3 symmetry. It consists of alternating layers of Ni and Ti along the rhombohedral axis with O layers between them.

Another description of nickel(II) titanite's illemite structure consists of a pseudo close packed hexagonal array of O2− ions with two thirds occupied by an ordered hexagonal like cation. The average crystallite's size was estimated at 42 nm with lattice constants of a = 5.032 Å, b = 5.032 Å, c = 4.753 Å.

Preparation

Nickel(II) titanate can be prepared by the autocombustion of a mixture of titanium isopropoxide, nickel(II) nitrate (oxidizer), and alanine (fuel) in isopropyl alcohol solution. The resulting dark green product is then calcined.

Another method involves heating NiO and TiO2 at 1350 °C for three hours.

:NiO + TiO2 → NiTiO3

NiTiO3 residue is formed in the thermal decomposition of the heterobimetallic complex Ni2Ti2(OEt)2(μ-OEt)6(2,4-pentanedionate)4.

Applications

Nickel(II) titanate is used as a yellow pigment. It has been used as a catalyst for toluene oxidation.

It is of research interest as an electronic material due to its high dielectric constant (40), weak magnetism, and semiconductivity. It has received attention as a possible candidate for multiferroic materials capable of magnetization through the application of an electric field.

References

References

1. PubChem. "Nickel titanium oxide".
2. Traistaru, G.A.. (July 2011). "Synthesis and Characterization of NiTiO₃ and NiFe₂O₄ as catalysts for Toluene Oxidation.". Digest Journal of Nanomaterials and Biostructures..
3. (1959-10-15). "Neutron Diffraction Study of Antiferromagnetic MnTiO₃ and NiTiO₃". Journal of the Physical Society of Japan.
4. (2009-05-06). "Photooxidation of water by NiTiO₃ deposited from single source precursor [Ni₂Ti₂(OEt)₂(μ-OEt)₆(acac)₄] by AACVD". Dalton Transactions.
5. (1992-04-01). "Beiträge zu den Eigenschaften von Titanaten mit Ilmenitstruktur. II. Zur Thermodynamik und elektrischen Leitfähigkeit von NiTiO₃ und anderen oxidischen Phasen mit Ilmenitstruktur". Zeitschrift für Anorganische und Allgemeine Chemie.
6. Jose, Sheethu. (2019-06-01). "Recent advances in infrared reflective inorganic pigments". Solar Energy Materials and Solar Cells.
7. Zhang, Xiaochao. (2015-11-01). "Structural, electronic and optical properties of Ilmenite ATiO3(A=Fe, Co, Ni)". Materials Science in Semiconductor Processing.
8. (2012-06-30). "Epitaxial growth of NiTiO₃ with a distorted ilmenite structure". Thin Solid Films.