Please use this identifier to cite or link to this item: http://ea.donntu.edu.ua:8080/jspui/handle/123456789/18464
Title: AN X-RAY AND GRAVIMETRIC STUDY OF THERMAL SYNTHESIS OF PZT SOLID SOLUTION FROM OXALATE PRECURSOR
Other Titles: ИССЛЕДОВАНИЕ СИНТЕЗА ТВЕРДОГО РАСТВОРА ЦТС ИЗ ОКСАЛАТНОГО ПРЕКУРСОРА МЕТОДАМИ РФА И ГРАВИМЕТРИИ
Authors: Приседский, Вадим Викторович
Погибко, Виктор Михайлович
Кисель, Николай Григорьевич
Удодов, Иван Александрович
Мысник, Ирина ВАсильевна
Ермолов, Михаил Михайлович
Keywords: оксалатный прекурсор
рентгенофазовый анализ
цирконат-титанат свинца
твердый раствор
синтез
Issue Date: 2013
Publisher: Донецк, ДонНТУ
Series/Report no.: Наукові праці ДонНТУ;Серія: Хімія і хімічна технологія, 2013. - Вип.2(21). - С.77-83
Abstract: The results of thermogravimetric and XRD studies of thermal decomposition of oxalate precursor of morphotropic PZT solid solution Рb(Zr0.52Ti0.48)O3 are presented. Oxalate precursor Pb[(Ti0,48Zr0,52)(C2O4)3]∙4H2O was obtained by precipitation reaction using titanium tetrachloride TiCl4, zirconium oxychloride ZrOCl2∙8H2O, lead nitrate Pb(NO3)2, oxalic acid H2C2O4∙2H2O and ammonia NH3 25% water solution as starting materials. According to thermogravimetric data, the loss of water molecules from the oxalate precursor takes place before 200°C, the decomposition rate increases sharply after the loss of first of three oxalate groups at about 250°C and the loss of all oxalate groups is practically complete at 350°C. XRD diffraction patterns of heat treated precursor samples confirm complete decomposition of oxalate groups before 350°C, then crystallization of PbO is observed and PbTiO3 and PbZrO3 appear at 450°C. Further increase in temperature of one-stage heat treatment leads to an increase in amounts of PbTiO3 and PbZrO3 but homogeneous PZT solid solution is not observed even at 800°C. There is antagonism between the rate of solid-state reactions between simple oxides formed in precursor decomposition and, from the other hand, the rate of particle growth for these oxides. To overcome this difficulty, a two-stage schedule of heat treatment was proposed: dwelling the precursor at 380°C and quick heating and dwelling at 800°C. Using this regime a homogeneous PZT solid solution has been synthesized.
URI: http://ea.donntu.edu.ua/handle/123456789/18464
ISSN: 2074-6652
Appears in Collections:Випуск 2(21)
Наукові статті кафедри загальної хімії

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