TY - JOUR

T1 - Formation of Bim+ 1Fem– 3Ti3O3m+ 3 (m = 4–9) Nanocrystals upon Thermal Decomposition of Coprecipitated Hydroxides

AU - Lomanova, N. A.

AU - Tomkovich, M. V.

AU - Osipov, A. V.

AU - Ugolkov, V. L.

AU - Panchuk, V. V.

AU - Semenov, V. G.

AU - Gusarov, V. V.

N1 - Publisher Copyright: © 2021, Pleiades Publishing, Ltd.

PY - 2021/5/1

Y1 - 2021/5/1

N2 - Abstract: Nanocrystals of Bim+ 1Fem– 3Ti3O3m+ 3 (m = 4–9) Aurivillius phases were synthesized by thermal decomposition of a coprecipitated mixture of bismuth, iron, and titanium hydroxides. The average crystallite size in nanopowders depends on m and is 50–100 nm. The samples were characterized by simultaneous thermal analysis, elemental analysis, X-ray diffraction, and Mössbauer spectroscopy. It was shown that the onset of Bim+ 1Fem– 3Ti3O3m+ 3 crystallization is near the melting point of the bismuth oxide-based non-autonomous (surface) phase (450°C). The Bim+ 1Fem– 3Ti3O3m+ 3 compounds where m ≤ 5 crystallize in one stage. The compounds where m > 5 are formed in two stages. First, Aurivillius phases with m ≈ 5 and an amorphous phase are formed. Then, the components of the amorphous phase are incorporated into the perovskite-like blocks of the Aurivillius (m ≈ 5) phases, most likely through their outer perovskite-like layers. Then, the components are redistributed between the outer and inner layers of the perovskite-like blocks. The elucidated dependence of the formation mechanism of Bim+ 1Fem– 3Ti3O3m+ 3 nanocrystals on their composition can be used in the technology of directed synthesis of nanocrystalline multiferroics.

AB - Abstract: Nanocrystals of Bim+ 1Fem– 3Ti3O3m+ 3 (m = 4–9) Aurivillius phases were synthesized by thermal decomposition of a coprecipitated mixture of bismuth, iron, and titanium hydroxides. The average crystallite size in nanopowders depends on m and is 50–100 nm. The samples were characterized by simultaneous thermal analysis, elemental analysis, X-ray diffraction, and Mössbauer spectroscopy. It was shown that the onset of Bim+ 1Fem– 3Ti3O3m+ 3 crystallization is near the melting point of the bismuth oxide-based non-autonomous (surface) phase (450°C). The Bim+ 1Fem– 3Ti3O3m+ 3 compounds where m ≤ 5 crystallize in one stage. The compounds where m > 5 are formed in two stages. First, Aurivillius phases with m ≈ 5 and an amorphous phase are formed. Then, the components of the amorphous phase are incorporated into the perovskite-like blocks of the Aurivillius (m ≈ 5) phases, most likely through their outer perovskite-like layers. Then, the components are redistributed between the outer and inner layers of the perovskite-like blocks. The elucidated dependence of the formation mechanism of Bim+ 1Fem– 3Ti3O3m+ 3 nanocrystals on their composition can be used in the technology of directed synthesis of nanocrystalline multiferroics.

KW - Aurivillius phases

KW - BiFeO

KW - Mössbauer spectroscopy

KW - nanocrystals

KW - perovskite-like oxides

KW - thermal behavior

KW - PHASES

KW - BiFeO3

KW - BI5FETI3O15

KW - BEHAVIOR

KW - STABILITY

KW - M&#246

KW - BIFEO3

KW - HYDROTHERMAL SYNTHESIS

KW - ssbauer spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85106941745&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/5741f297-de8f-3818-9c35-027f6fdf473b/

U2 - 10.1134/s0036023621050090

DO - 10.1134/s0036023621050090

M3 - Article

AN - SCOPUS:85106941745

VL - 66

SP - 755

EP - 764

JO - Russian Journal of Inorganic Chemistry

JF - Russian Journal of Inorganic Chemistry

SN - 0036-0236

IS - 5

ER -