Научная электронная библиотека ULRICH'S Periodicals Directory

Сибирский государственный университет
науки и технологий имени академика М.Ф. Решетнева

Сибирский аэрокосмический журнал
ISSN 2712-8970 (Print) ISSN 2782-5760 (on-line)

Сведения об образовательной организации

UDK 537.312:538.911'956
THE EFFECT OF CATION SUBSTITUTION ON POLYMORPHIC TRANSITIONS IN BISMUTH PYROSTANNATE Bi2Sn2O7
L. V. Udod1,2*, M. N. Sitnikov1
1Reshetnev Siberian State Aerospace University 31, Krasnoyarsky Rabochy Av., Krasnoyarsk, 660037, Russian Federation 2Kirensky Institute of Physics, SB RAS 50–38, Akademgorodok, Krasnoyarsk, 660036, Russian Federation *E-mail: luba@iph.krasn.ru
The goal of this work is to develop a new technology of sensor materials required for gas sensing devices used in missile. The aim of this work is to study the effect of doping cations with different valency on the crystallographic structure, dielectric and electrical properties of pyrochlore compound Bi2Sn2O7 with selectivity to gases. Polycrystal-line compounds Bi2(Sn1-xMex)2O7, where Me = Mn, Cr, x = 0, 0.05 have been synthesized by conventional solid-state reaction. According to the X-ray powder diffraction research, our sample consists of two polymorphs phases: cubic and rhombic. Two new structural transition are found in Bi2 (Sn0.95Cr0.05)2O7 solid solutions by scanning calorimetry, as compared to bismuth pyrostannate Bi2Sn2O7. Ions Mn4+ leads to shift of phase boundary of polymorphic transitions towards lower temperatures, and the phase α→β-transition at about 370 K, which is characteristic for Bi2(Sn1-xCrx)2O7, where x = 0, 0.05 is suppressed. The polymorphic transition at T = 543 K for Bi2(Sn0.95Mn0.05)2O7 occurs with calorification, in contrast to Bi2(Sn1-xCrx)2O7, where x = 0, 0.05. The relationship between structural, electrical and dielectric properties is investigated. Anomalies in the tempera-ture dependence of electrical resistivity and dielectric permeability (real and imaginary part) as in the low region temperatures as in the high region temperature are found. These features are explained within a model of martensitic phase transitions. The temperature of the structural phase transitions correlates with temperature of maximum of the electrical resistivity in the temperature range 300 < T < 1000 K for Bi2(Sn1-xCrx)2O7, x = 0, 0.05 was found by scanning calorimetry method.
Keywords: polymorphic transitions, dielectric permeability, cation substitution, electrical resistivity, differential scanning calorimetry.
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Udod Lubov Biktorovna – Cand. Sc., Docent of Physics department, Reshetnev Siberian State Aerospace University, research assistant of Kirensky Institute of Physics, SB RAS. E-mail: luba@iph.krasn.ru.

Sitnikov Maxim Nikolaevich – postgraduate student of Physics department, Reshetnev Siberian State Aerospace University. E-mail: kineru@mail.ru.