Synthesis and Study of Nanoceramics of the Spinel Class

L. V. Morozova^a, M. V. Kalinina^a, I. A. Drozdova^a, I. G. Polyakova^a, and O. A. Shilova^a,b

^aGrebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034
Russia

^bSt. Petersburg State Electrotechnical University (LETI), ul. Prof. Popova 5, St. Petersburg, 197022 Russia

e-mail: morozova_l_v@mail.ru

Received November 21, 2014

Abstract—Based on the method of combined crystallization, a low-temperature technology for the synthesis
of nanocrystalline compounds with a spinel structure (MgAl₂O₄, MgCr₂O₄, and NiCo₂O₄) has been developed.
The effect of ultrasonic treatment on the dispersity of crystal hydrates formed during synthesis has been dem-
onstrated. Mesoporous ceramic samples of MgAl₂O₄ and MgCr₂O₄ with bimodal pore size distribution have
been synthesized. The temperature dependence of the specific electrical conductivity of spinels has been studied
and it has been established that the conductivity of the inverted spinel (NiCo₂O₄) is substantially higher than
that of regular spinels (MgAl₂O₄, MgCr₂O₄).

Keywords: spinel, combined crystallization, ultrasound, porosity, electric conductivity

DOI: 10.1134/S1087659615060115

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