Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Structural and transport properties of doped bismuth titanates and niobates. / Sadykov, V. A.; Koroleva, M. S.; Piir, I. V. и др.
в: Solid State Ionics, Том 315, 01.02.2018, стр. 33-39.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Structural and transport properties of doped bismuth titanates and niobates
AU - Sadykov, V. A.
AU - Koroleva, M. S.
AU - Piir, I. V.
AU - Chezhina, N. V.
AU - Korolev, D. A.
AU - Skriabin, P. I.
AU - Krasnov, A. V.
AU - Sadovskaya, E. M.
AU - Eremeev, N. F.
AU - Nekipelov, S. V.
AU - Sivkov, V. N.
N1 - Publisher Copyright: © 2017 Elsevier B.V.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - Cobalt- or Zn-doped bismuth titanates and Mg + Cu-doped bismuth niobate were synthesized by the method of organic-inorganic precursors combustion. Distribution of dopants over the sites of the pyrochlore structure was elucidated by X-ray powder diffraction structure refinement and pycnometric density analysis. Zinc and cobalt cations are mainly located in Bi sites appearing also in Ti sites at their high content. Mg cations are located only in Nb sites, while Cu cations are equally distributed between Bi and Nb sites. Magnetic susceptibility data confirm Сo2 + state of cobalt atoms revealed by NEXAFS. Antiferromagnetic exchange appears when Сo atoms enter the titanium sites. Electronic conductivity of p-type dominates for Co-doped samples in the 160–750 °C temperature range. The oxygen mobility and surface reactivity were studied by the oxygen isotope heteroexchange with C18O2 in isothermal and temperature-programmed modes. Mobility of the lattice oxygen can be described by a homogeneous model. The oxygen mobility and surface reactivity are comparable for doped bismuth titanates and niobates correlating with conductivity and being the highest for Co and Cu-doped samples with disordered distribution of dopants between lattice sites. Classification codes A6630L A7280G A8120E A8170J B2130 B2520E
AB - Cobalt- or Zn-doped bismuth titanates and Mg + Cu-doped bismuth niobate were synthesized by the method of organic-inorganic precursors combustion. Distribution of dopants over the sites of the pyrochlore structure was elucidated by X-ray powder diffraction structure refinement and pycnometric density analysis. Zinc and cobalt cations are mainly located in Bi sites appearing also in Ti sites at their high content. Mg cations are located only in Nb sites, while Cu cations are equally distributed between Bi and Nb sites. Magnetic susceptibility data confirm Сo2 + state of cobalt atoms revealed by NEXAFS. Antiferromagnetic exchange appears when Сo atoms enter the titanium sites. Electronic conductivity of p-type dominates for Co-doped samples in the 160–750 °C temperature range. The oxygen mobility and surface reactivity were studied by the oxygen isotope heteroexchange with C18O2 in isothermal and temperature-programmed modes. Mobility of the lattice oxygen can be described by a homogeneous model. The oxygen mobility and surface reactivity are comparable for doped bismuth titanates and niobates correlating with conductivity and being the highest for Co and Cu-doped samples with disordered distribution of dopants between lattice sites. Classification codes A6630L A7280G A8120E A8170J B2130 B2520E
KW - Bismuth titanates/niobates
KW - Conductivity
KW - Oxygen mobility
KW - Structure
KW - BI2TI2O7
KW - LA
KW - DIELECTRIC-PROPERTIES
KW - PYROCHLORES
KW - RELAXATION
UR - http://www.scopus.com/inward/record.url?scp=85037523162&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2017.12.008
DO - 10.1016/j.ssi.2017.12.008
M3 - Article
AN - SCOPUS:85037523162
VL - 315
SP - 33
EP - 39
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
ER -
ID: 9160978