晶体熔点

利用正交设计法设计了一些实验参数，较系统地研究了不同升温速率、试样量、炉体气氛流量对晶体熔点的影响。

Take urea as an instance , the best parameters of DSC experiment are provided , and the analysis of DSC standard error is discussed .

通过对制备出的产品进行熔点测定、红外光谱分析，确定了其晶体熔点为144～146℃，具备木糖的红外光谱特征。

With a melting point determination , and infrared spectrum analysis , the prepared crystal was definite to be at a melting point of 144 ~ 146 ℃, and possess the infrared spectrum characteristic of xylose .

模型不仅预测了随表面原子百分数的增大自由表面纳米晶体熔点与熔化熵的减少及包覆纳米晶体熔点与熔化熵的增加，还对纳米晶体产生过冷和过热的条件进行了分析。

The model predicts that with increasing surface-to-volume atomic ratio , the melting temperature and melting entropy of free-standing nanocrystals will decrease while the above two parameters for the embedded nanocrystals will increase , and the conditions of supercooling and superheating of nanocrystals are discussed as well .

结果：所合成的化合物为白色或黄色晶体，熔点在200&230℃左右，各个化合物结构均经IR、~1HNMR、MS和元素分析确证。

Their chemical structures were determined by IR , ~ 1HNMR , MS and elemental analysis .

同时发现：ZnO的掺入使得上部晶体的熔点升高。

With ZnO doping , the melting point of the upper side of the crystal increases .

由DTA曲线确定了晶体的熔点，通过TG曲线表明晶体在熔点以下的热稳定性很好，适合采用提拉法生长。

It is suitable to be grown by Cz method . The melting points of crystal was obtained from TG-DTA curves .

经TG-DTA分析，确定晶体的熔点及相转变温度，晶体在熔点以下除相变外无其他变化，适于用顶部籽晶提拉法在相变温度下生长此类晶体。

There is no other change besides phase transition below the melting point , which is applicable to grow these crystals by TSSG method .

Er：LCB晶体的熔点大约为1048℃。

The melting point of Er : LCB crystal is about 1048 ℃ .

主要用于药物、染料、香料等晶体有机化合物熔点之测定。

It is mainly used for measuring the melting point of crystalline compounds , like drug , dye , and flavor , etc.

测定晶体物质的熔点以确定其纯度。

The apparatus is used for measuring the melting point of crystalline substance , so as to determine the purity of the substance .

研究表明在聚氨酯/炭黑中加入有机酸晶体，在晶体熔点附近可产生明显的PTC效应，而在涂料中加入2种有机盐晶体，无明显的PTC效应。

Results showed that the coating added organic acid crystal displays distinct PTC effect ; PTC effect was not obvious when two kinds of organic salt crystal were added in the coating .

用DSC测试结果表明，聚氨酯／炭黑／有机晶体复合体系的PTC开关温度与有机晶体的熔点基本一致，可以通过控制加入的有机晶体的熔点来控制复合体系的PTC开关温度。

The result of DSC shows that the switch temperature of PU / CB / organic crystal composites is accord with the melting point of organic crystal and can be controlled by controlling the melting point of organic crystals .