| 1. | Study on pyrochlore in synthesis process of lead - based relaxor ferroelectrics
铅基弛豫铁电材料中的焦绿石相研究 |
| 2. | The influence of pellet technique and microwave method on the emerge of the intermediate pyrochlore phase was studied
通过压片煅烧和微波合成等工艺考查了压片及快速升温对焦绿石相的生成的影响。 |
| 3. | It seems that a pseudo cubic phase was formed . the pyrochlore phase is effectively restrained in pt / tb powders . fluorescent properties of pt / tb sol and powders were investigated
Tb离子特征荧光仅出现在pt / tb的溶胶状态体系，在粉末状态下tb离子的特征荧光显著减弱。 |
| 4. | The optimum mole ratio of flux to composition was found to be 6 : 4 , which can restrain the formation of pyrochlore phase . it was revealed that b2o3 additive played an important role in increasing the size of single crystals . 4
助熔剂和组分间的摩尔配比以6 ： 4为佳，能够抑制焦绿石相的产生；此外，添加少量的b _ 2o _ 3作助熔剂有利于晶体的长大。 |
| 5. | The precursor method could solve the problem that the appearance of pyrochlore phase during the synthesis procedure by avoiding the direct reaction between pbo and nb _ ( 2 ) o _ ( 5 ) . furthermore it also could decrease calcination temperature and pbo volatility
采用二次合成法制备pmn - pt钙钛矿相，避免了pbo和nb _ 2o _ 5的直接反应，从而抑制了焦绿石相的生成。 |
| 6. | In this study , precursors have been prepared by coprecipitation . the precursors prepared by coprecipitation have high purity , homogeneity and reactivity etc . thus it can decrease synthesis temperature and pbo volatility . furthermore the pyrochlore phase is hardly formed during synthesis
通过化学共沉淀法制备前驱体，使各组份能以原子尺度进行混合，提高反应活性，有效降低合成温度，最大限度地减少铅挥发造成的污染，同时避免焦绿石相的生成。 |
| 7. | Under no excess pbo flux environment , the perovskite phase of pmnt single crystals were more stable than that of pznt , but it was found to be the decomposition of perovskite crystals into pyrochlore crystals at 1250 . the pure perovskite pznt crystals prepared by the pbo flux method were thermodynamically metastable
在无pbo条件下pmnt晶体较pznt晶体稳定，但在1250附近的高温下会发生向焦绿石相的分解反应； pznt单晶体是亚稳定的，在高温时亦分解生成焦绿石相和pbo 。 |
| 8. | As - grown pmnt single crystal were pure perovskite structure and regular pseudo - cubic while pznt showed an arrow - head shape with the formation of pyrochlore phases . 3 . processing conditions were optimized in order to increase the size and yield of perovskite crystals by a high temperature flux solution method
制备pmnt单晶时均生成纯立方钙钛矿相结构，无焦绿石相产生，晶体几何外形多为规则的立方结构；制备的pznt单晶材料形状不规则，呈箭头状，且伴随有焦绿石相生成，因此纯相的pznt单晶材料较pmnt晶体更难合成。 |
