Synthesis of fine-crystalline tetragonal barium titanate in low-density water fluid

Kholodkova, A.A.; Danchevskaya, M.N.; Ivakin, Y.D.; Murav'eva, G.P.

Авторы: Kholodkova Anastasia A., Danchevskaya Marina N., Ivakin Yurii D., Murav'eva Galina P.
Сборник: 14th European Meeting on Supercritical Fluids
Тезисы
Год издания: 2014
Место издания: Marseille, France
Первая страница: 124
Последняя страница: 124
Аннотация: Tetragonal BaTiO3 is widely known for its excellent ferroelectric characteristics. BaTiO3 crystals find application in electrorheological materials, ceramics for multilayer ceramic capacitors and other fields. Low-temperature methods of synthesis (hydrothermal, sol-gel, co-precipitation, etc.) allow obtaining of fine and pure BaTiO3 crystals, but usually yield to product in (pseudo)cubic modification at ambient temperature. It is of interest to develop the processing of uniform, dispersed, crystalline tetragonal BaTiO3 particles. In present work BaTiO3 was synthesized from TiO2 and Ba(OH)2∙8H2O in low-density water fluid media at 230°C and 2,94 MPa for 20 h. SEM study showed that BaTiO3 particles possess spherical shape and size of 160-240 nm. BaTiO3 sample was divided into two parts: (1) and (2). The (1) was washed in acetic acid solution and distilled water from BaCO3 admixture and heated at 500°C for 1 h in air to eliminate absorbed H2O. The (2) was first heated at 500°C, 1 h, and then washed in acid. After the treatment no aggregation was observed at SEM in both (1) and (2) parts. Highly tetragonal BaTiO3 shows peak splitting in X-ray diffractogram at 45°2θ, while cubic phase is characterized by single symmetric peak at this angle. XRD results show that structures of (1) and (2) samples are tetragonally distorted. In (1) peak at 45°2θ is strongly asymmetric, and in (2) its splitting is observed. Consequently, the process in low-density water fluid is appropriate for synthesis of uniform fine tetragonal crystals of BaTiO3.
Добавил в систему: Холодкова Анастасия Андреевна

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