Физико-химические свойства оксигидроксида иттрия, полученного при рН, близком к точке нулевого заряда

V. Avdin; M. Mironenko; D. Zherebtsov; D. Uchaev; G. Vyatkin

Authors

V. Avdin South Ural State University
M. Mironenko South Ural State University
D. Zherebtsov South Ural State University
D. Uchaev South Ural State University
G. Vyatkin South Ural State University

Keywords:

yttrium oxyhydroxide, point of zero charge, sol-gel synthesis, physicochemical properties, X-ray diffraction, electron microscopy, thermal analysis, structure formation

Abstract

Sol-gel synthesis of metal oxyhydroxides is attractive for its simplicity and the ability to be carried out under mild conditions. However, the reproducibility of results and the scalability of the methods are often limited by their high sensitivity to synthesis parameters. Among them, the final pH value is the main factor, determining the surface charge of the forming particles and the mechanisms of struc-ture formation. For yttrium oxyhydroxide YOx(OH)y(H2O)k, which serves as a precursor to yttrium ox-ide (Y2O3) used in catalysis, ceramics, luminescent and sensor materials, synthesis near the point of zero charge (pHpzc) is of particular interest. In this state, the particle surface is formally uncharged, which increases its reactivity and makes the system most sensitive to external influences. Moreover, yttrium oxide formed during original oxyhydroxide thermolysis largely inherits the morphology and dispersity of the original precursor (taking into account inevitable changes associated with water loss), which is important to consider for targeted regulation of the final product properties already at the stage of oxyhydroxide synthesis. In this work, yttrium oxyhydroxide samples were obtained by the sol-gel method from a dilute yt-trium nitrate solution (0.01 M) with varying synthesis pH near the pHpzc, which was found to be 9.08. Using a set of methods (XRD, SEM, TEM, simultaneous thermal analysis with mass spectrometry), it was established that samples synthesized at pHpzc are characterized by minimum coherent scattering region (CSR) sizes after calcination (≈175 Å), a ratio of spherical to plate-like particles close to 1:1, as well as the maximum amount of structurally bound water and minimal impurity content. Thus, car-rying out the synthesis at a pH equal to the pHpzc ensures the formation of yttrium oxyhydroxide with specific structural and morphological characteristics and enhanced sensitivity to other process pa-rameters, and can serve as a convenient model system for in-depth study of the structure formation mechanisms of this material, including under external influences, as well as for obtaining yttrium ox-ide with reproducible properties.

Author Biographies

V. Avdin, South Ural State University

доктор химических наук, профессор, заведующий кафедрой экологии и химической технологии

M. Mironenko, South Ural State University

студент кафедры теоретической и прикладной химии

D. Zherebtsov, South Ural State University

доктор химических наук, старший научный сотрудник кафедры материаловедения и физико-химии материалов

D. Uchaev, South Ural State University

научный сотрудник Научно-образовательного центра «Нанотехнологии»

G. Vyatkin , South Ural State University

доктор химических наук, профессор, чл.-корр. РАН, советник при ректорате

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