液相一步合成金红石型超细TiO_2

Preparation of Ultrafine Rutile Titania Crystals by Liquid Method

二氧化钛在自然界中存在三种结晶形态：金红石型、锐钛矿型和板钛矿型．金红石型ＴｉＯ２因其折射率高，性能优越，因而得到广泛的应用［１～３］．传统金红石型ＴｉＯ２的制备需经高温固相反应，经历由无定形→锐钛矿→金红石的转化过程．通常情况下，锐钛矿到金红石型Ｔ...

Rutile titania crystals were directly prepared in liquid system without anatase\|to\|rutile transformation, while Ti(SO\-4)\-2 and ammonia are the raw materials. The process of preparation can be divided into two parts: one is precipitating, the other is peptizing. The conditions of \{precipitating\} influence the structure of the resulted crystals, even though \{Ti(OH)\-4\} precipitates \{obtained\} during precipitating are amorphous. Peptizing is the process of the formation of crystals, the amorphous Ti(OH)\-4 precipitates changing into titania with the change of rutile structure.