碱土

Aiming at some defects existing in PMN ferroelectric ceramics, such as excessive sintering temperature and lower curie temperature, this paper gives an introduction to various kinds of dopings, such as rare earth, alkaline earth and transition metal, which have effects on dielectric properties, sintering temperature and microstructure of PMN-typed ferroelectric ceramics.

针对PMN铁电陶瓷存在烧结温度过高、居里温度较低等缺陷问题，分别介绍了稀土、碱土、过渡金属等掺杂对PMN铁电陶瓷介电性能、烧结温度及微观结构等的影响。

Keywords: Hydrothermal Synthesis; alkaline earth stannates; Microporous and Mesoporous Structures

中文关键词：水热合成；碱土锡酸盐；微孔和中孔结构

Sherds were collected from Hongzhou Kiln covering 8 periods from Eastern Han to Late Tang Dynasty/the Five Dynastied and their bodies were analysed by NAA. The results show that the elemental contents in different samples are quite distinct, even for those in the same period. It means no single element can be used as "fingerprint" to distinguish the period. The curves of the contents of Na, Rb, Ba and Fe varying with lime are very similar, like "U" shape.

对江西洪州窑从东汉晚期至晚唐五代8期400个瓷胎样品进行了中子活化分析，分析结果显示碱金属元素Na和Rb、碱土金属元素Ba及Fe等作为胎的助熔剂元素随年代的变化趋势相似，都呈现出两头高中间低的U字形变化规律，其中Fe作为呈色元素，其含量的高低与瓷胎颜色的深浅是一致的。

Sherds were collected from Hongzhou Kiln covering 8 periods from Eastern Han to Late Tang Dynasty/the Five Dynastied and their bodies were analysed by NAA. The results show that the elemental contents in different samples are quite distinct, even for those in the same period. It means no single element can be used as "fingerprint" to distinguish the period. The curves of the contents of Na, Rb, Ba and Fe varying with time are very similar, like "U" shape.

对江西洪州窑从东汉晚期至晚唐五代8期400个瓷胎样品进行了中子活化分析，分析结果显示碱金属元素Na和Rb、碱土金属元素Ba及Fe等作为胎的助熔剂元素随年代的变化趋势相似，都呈现出两头高中间低的U字形变化规律，其中Fe作为呈色元素，其含量的高低与瓷胎颜色的深浅是一致的。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。