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Mechanism of Sm2MoO6 Phase Formation from a Mechanically Activated Oxide Mixture

  • DYNAMICS OF PHASE TRANSITIONS
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Russian Journal of Physical Chemistry B Aims and scope Submit manuscript

Abstract

The mechanism of phase formation from the initial and the mechanically activated (m/a) mixture of Sm2O3+MoO3 oxides is studied by differential scanning calorimetry (DSC) in an oxygen atmosphere. It is shown that different mechanisms of samarium oxymolybdate synthesis are realized in these two cases. As a result of the mechanochemical action at room temperature, a nanosized mixture of Sm2(MoO4)3 and Sm2O3 is formed. Upon heating, Sm2(MoO4)3 is crystallized at the first stage and its interaction with Sm2O3 in the second stage at 900°C leads to the synthesis of oxymolybdate Sm2MoO6 with a scheelite structure, and this structure type is stable up to 1400°C. The kinetic experiment in a DSC cell shows only an apparent similarity of the phase formation mechanism with a decrease of the main exoeffects by 70°C for a m/a mixture of oxides. At the same time, the study of the mechanism of phase formation by isothermal exposure at different temperatures reveals the main advantages of ceramic synthesis from an activated oxide mixture. The total conductivity of Sm2MoO6 with a scheelite structure, which turned out to be of the p-type (1 × 10−6 S/cm at 600°C), is studied.

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Funding

The work was supported partially by the subsidy from the Ministry of Education and Science allocated by the FRC CP RAS for the implementation of the state assignment (registration no. 122040500071-0, 122040500068-0). Measurements of the conductivity of the samples were carried out within the framework of the state task of the FRC PCP MC RAS (FFSG-2024-0006).

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Authors and Affiliations

  1. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russia

    E. D. Baldin, G. A. Vorobieva, I. V. Kolbanev & A. V. Shlyakhtina

  2. Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Russia

    N. V. Lyskov

  3. National Research University Higher School of Economics, Moscow, Russia

    N. V. Lyskov

Authors
  1. E. D. Baldin
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  2. G. A. Vorobieva
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  3. I. V. Kolbanev
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  4. N. V. Lyskov
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  5. A. V. Shlyakhtina
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Correspondence to E. D. Baldin.

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Baldin, E.D., Vorobieva, G.A., Kolbanev, I.V. et al. Mechanism of Sm2MoO6 Phase Formation from a Mechanically Activated Oxide Mixture. Russ. J. Phys. Chem. B 18, 203–209 (2024). https://doi.org/10.1134/S1990793124010056

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  • DOI: https://doi.org/10.1134/S1990793124010056

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