SYNTHESIS AND PROPERTIES OF NdMeIITeO4 5(MeII - Ca,Ba) TELLURITES
Rustembekov K. Toibek A. Stoev M. Mukusheva G. Sadykov T.
2024University of Chemical Technology and Metallurgy
Journal of Chemical Technology and Metallurgy
2024#59Issue 1157 - 164 pp.
The aim of this work was to synthesize and investigate the roentgenographic and electro-physical properties of new phases, namely double tellurites of neodymium. Oxotellurites of the composition NdMeIITeO4.5 (MeII - Ca, Ba) were synthesized by the method of ceramic technology with high-temperature interaction of Nd2O3, TeO2 oxides with carbonates of alkaline earth metals in the interval of 800°G - 1200°G Roentgenograms of the synthesized compounds were obtained using an Empyrean powder diffractometer by PANalytical and indication was determined using the X’Pert HighScore Plus program. It was found that the synthesized tellurites were crystallized in tetragonal syngony. The unit cell parameters, roentgen and pycnometric densities of the compounds were determined. It was revealed that with increasing ionic radii from Ca to Ba, the lattice parameters and unit cell volumes of synthesized tellurites increase. The assumed structure of the synthesized double tellurites of neodymium is a distorted perovskite structure. A study of the temperature dependence of the dielectric permittivity and electrical resistance of tellurites of neodymium-alkaline earth metals established that they can possess semiconducting properties at 293 K - 483 K. Temperature coefficients of resistance and forbidden zone width of tellurites were calculated.
dielectric permittivity , electrical resistance , neodymium , synthesis , tellurites , X-ray phase analysis
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Department of Inorganic and Technical Chemistry NLC, Karagandy University of the name of Academician E.A. Buketov, Universitetskaya 28 str., Karaganda, 100024, Kazakhstan
Department of Chemistry, South-West University “Neofit Rilski”, Ivan Mikhailov 66 str., Blagoevgrad, 2700, Bulgaria
Department of Inorganic and Technical Chemistry NLC
Department of Chemistry
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