If these were equivalent (within 1 K), the temperature was recorded as that for the reversible equilibrium between Co304 (s), CoO (s), and the oxygen partial pressure as calculated from the set composition of the atmosphere.

Analytic descriptions of the Gibbs energy of reaction as well as of the partial pressure of oxygen as a function of temperature were developed in all above-mentioned works.

Synthesis Cobalt (II) oxide, CoO, converts to Co3O4 upon heating at around 600–700 °C (1,112–1,292 °F) in air. [5] Above 900 °C (1,650 °F), CoO is stable. [5][7] These reactions are described by the following equilibrium: 2 Co3O4 ⇌ 6 CoO + O2

Here we elucidate the transformation of Co 3 O 4 nanoparticles to CoO into nanoscale detail by in situ heating in the transmission electron microscope (TEM), and we decipher the energetics and magnetic properties of the Co 3 O 4 /CoO interface from first principles calculations.

Oxygen pressures in equilibrium with solid (Co3O4 + CoO) have been measured using a thermogravimetric technique in which reversibility can be confirmed and may be expressed as...

This guide provides a comprehensive overview of the common cobalt oxide phases—Cobalt(II) Oxide (CoO), Cobalt(II,III) Oxide (Co3O4), and the less stable Cobalt(III) Oxide (Co2O3)—focusing on their structure, thermodynamic stability, and the interplay between them.

Co3O4/CoO系は高いエネルギー貯蔵密度と良好な反応特性のため、中高温熱化学蓄熱の分野で広い応用前景がある。 Co3O4/CoO系の酸化還元反応に及ぼす酸素濃度と加熱/冷却速度の影響を,熱重量分析 (TGA)と示差走査熱量測定 (DSC)によって研究した。 実験結果は,酸素濃度と加熱/冷却速度の増加は,酸化還元速度を増加させるが,しかし,より高い酸素濃度は,還元反応を抑制するかもしれないことを示した。 還元反応エンタルピーに及ぼす酸素濃度と加熱速度の影響は明らかでなかった。 速度論的結果は,還元反応がランダム核形成モデルAvrami-Erofeyev (A2)と一致することを示した。

An excess of oxygen in Co3O4 was found to generate cation vacancies [1993Kuz], but the deviations from stoichiometry for Co3O4 are not well known and are assumed to be small.

The thermodynamic properties of CoO, Co 3 O 4, and the liquid phase were assessed, and an optimized set of parameters of Gibbs energy functions is proposed. The two stable solid oxides, CoO and Co 3 O 4, were both treated as stoichimetric compounds.

The stability of cobalt oxide phases is dictated by thermodynamic parameters such as Gibbs free energy of formation and is influenced by temperature and oxygen partial pressure.