New thermodynamic data for CoTiO3, NiTiO3 and CoCO3 based on low-temperature calorimetric measurements

Abstract

The low-temperature heat capacities of nickel titanate (NiTiO3), cobalt titanate (CoTiO3), and cobalt carbonate (CoCO3) were measured between 2 and 300 K, and thermochemical functions were derived from the results. Our new data show previously unknown low-temperature lambda-shaped heat capacity anomalies peaking at 37 K for CoTiO3 and 26 K for NiTiO3. From our data we calculate standard molar entropies (298.15 K) for NiTiO3 of 90.9 ± 0.7 J mol-1 K-1 and for CoTiO3 of 94.4 ± 0.8 J mol-1 K-1. For CoCO3, we find only a small broad heat capacity anomaly, peaking at about 31 K. From our data, we suggest a new standard entropy (298.15 K) for CoCO3 of 88.9 ± 0.7 J mol-1 K-1.

Atomic Layer Deposition of oriented nickel titanate (NiTiO3)

“…The magnetic structures for a selection of them are depicted in Figure 2.4. Below the Néel temperatures, magnetic moments in NiTiO3 (23-26 K) [102,103] and CoTiO3 (37 K) [103] order ferromagnetically within each layer of Ni 2+ /Co 2+ , with non-magnetic layers of Ti 4+ separating the antiferromagnetic coupling along the c axis, similar to FeTiO3 (Figure 2.4 i). Contrary to FeTiO3, the moments are directed perpendicular to the c axis.…”

Photocatalytic Performance of Titanates with Formula MTiO3 (M= Fe, Ni, and Co) Synthesized by Solvo-Combustion Method

“…The titanates of transition metals like Fe, Ni, Co-own diverse properties such as electricity, magnetism and semiconductivity [1][2][3][4] . These properties make titanates widely used in industry, for example, such as semiconductor rectifiers, electrodes of a solid oxide fuel cell, metal-air barrier, hydro-carbonate catalyzers, color mixtures for surface coating and gas sensing devices, among other applications [5][6][7][8][9][10] . Moreover, the application of titanates as photocatalysts is attracting considerable attention for the water and air purification.…”

Magnetic dilution of a honeycomb lattice XY magnet CoTiO3

“…A 1:1 stoichiometric ratio was measured and the materials were ground by pestle and mortar for ∼15 min to be fully mixed. The mixed powder was reacted at 1150 • C for 24 h [25].…”