Development of dysprosium titanate based ceramics
Development of dysprosium titanate based ceramics
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DOI：
10.1111/j.1551-2916.2005.00211.x
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发表时间：
2005-04
影响因子：
3.9
通讯作者：
A. Sinha;B. Sharma
中科院分区：
文献类型：
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作者：
A. Sinha;B. Sharma
钛酸镝(Dy2TiO5)基陶瓷是热堆控制棒材料之一。该陶瓷是通过传统的混合和焙烧工艺制备的。从Dy2 O3-TiO2起始混合物中生成Dy2 TiO5相是一个分两步进行的过程。在第一步反应中，Dy2Ti2O7(Dy2Ti2O7)相的形成是在700℃左右进行的。Dy2Ti2O7在1100℃左右与混合物中剩余的Dy2O3反应生成Dy2TiO5。Dy2TiO5相具有三种晶型(正交晶型、六方晶型和萤石晶型)。据报道，当用作热反应堆中的控制棒元件时，萤石相具有最低的在役辐照膨胀特性。在本研究中，Dy2TiO5的萤石晶型通过掺杂三氧化钼得到了稳定。
Dysprosium titanate (Dy 2 TiO 5 ) based ceramic is one of the control rod materials for thermal reactors. This ceramic has been prepared by conventional mixing and calcination technique. The formation of Dy 2 TiO 5 phase from the Dy 2 O 3 -TiO 2 starting mixture has been found to be a two-step process. In the first step, the formation of dysprosium dititanate (Dy 2 Ti 2 O 7 ) phase takes place at 700°C. This Dy 2 Ti 2 O 7 reacts at around 1100°C with remaining Dy 2 O 3 present in the mixture to form Dy 2 TiO 5 . The Dy 2 TiO 5 phase has three polymorphs (orthorhombic, hexagonal, and fluorite). The fluorite phase is reported to have lowest in-service irradiation swelling characteristics when used as control rod elements in thermal reactors. In the present investigation, the fluorite polymorph of Dy 2 TiO 5 has been stabilized by doping with molybdenum trioxide.