Kholodkova Anastasia, Danchevskaya Marina, Fionov Alexandr Study of Nanocrystalline Barium Titanate Formation in Water Vapour Conditions. In: 4th International Conference NANOCON 2012, 23-25.10.2012, Brno, Czech Republic, EU , TANGER Ltd. , С. 66-71.
Полный текст не доступен из этого репозитория.Аннотация
Barium titanate (BaTiO3) ceramics is widely used in electronics due to excellent dielectric characteristics. An actual problem is to work out a simple and low-cost way for production of uniform BaTiO3 nanocrystals. In this report the results of the use of thermovapourous method for barium titanate nanocrystals synthesis are given. The synthesis was carried out in water vapour at temperature ranged from 110°C to 200°С and water vapour pressure of 0,2 – 1,6 MPa. The product was characterized by powder X-ray diffraction, scanning and transmission electron microscopy, dielectric spectroscopy. From the results, it was found that the process of barium titanate crystals formation from mechanical mixture of BaO and TiO2 proceeds by solid-state mechanism. The interaction of starting oxides with water vapour contributes to the structural mobility and facilitates the formation of barium titanate phase. As revealed, thermovaporous method allows producing of sphere-shaped crystalline BaTiO3 with particle size of 20 – 50 nm. From X-ray method data BaTiO3 consists of cubic and tetragonal phases mixture. The morphology of product is raspberry-like aggregates of nanoparticles. The value of dielectric permittivity of BaTiO3 powder (1,9 g/cm3) is about 20 at 1 kHz, 13 at 1 MHz and 10 at 1…2 GHz. Loss tangent ranges from 0,18 at 1 MHz to 0,05 at 1…2 GHz.
| Тип объекта: | Доклад на конференции или семинаре (Статья) |
|---|---|
| Авторы на русском. ОБЯЗАТЕЛЬНО ДЛЯ АНГЛОЯЗЫЧНЫХ ПУБЛИКАЦИЙ!: | Холодкова А.А., Данчевская М.Н., Фионов А.С. |
| Подразделения (можно выбрать несколько, удерживая Ctrl): | 193 лаб. физических свойств нанокомпозитных материалов для информационных технологий |
| URI: | http://cplire.ru:8080/id/eprint/2747 |
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