The paper summarized the negative thermal expansion coefficient compounds and their contraction mechanism reported in recent 20 years. 综述了近20年有关负膨胀系数化合物及其收缩机理的报道;
In order to decrease the particle size, polyethylene glycol ( PEG ) was used as dispersant and the influence of the amount of PEG on the particle size and negative thermal expansion coefficient were also studied. 为降低共沉淀法制备的粉体粒径,以聚乙二醇(PEG)为分散剂,考察加入量对粉体粒径的影响,进而探索负热膨胀系数与粉体粒径的关系。
The negative thermal expansion coefficient was calculated using the lattice constants obtained by Powder X software using the data collected at different temperatures by in Situ X-ray measurement. 利用变温X射线衍射仪精确收集粉体在不同温度下的XRD数据,以PowderX软件分别计算在不同温度下的晶胞参数,进而计算其负热膨胀系数。
A fiber Bragg grating is bonded on special material with a negative thermal expansion coefficient. The simple and compact temperature compensation fiber Bragg grating package is demonstrated. 提出了一种简单、小型的光纤光栅温度补偿器件,将光纤光栅粘贴在具有负热膨胀系数的材料上,实现了光纤光栅的温度补偿。
According to estimating theoretically, quasicrystalline alloys have negative thermal expansion coefficient, and the thermal expansion coefficient of Al-Cu-Cr quasicrystalline alloys are lower than that of Al-Cu-Fe quasicrystalline alloys. 通过理论估算,准晶合金具有负的热膨胀系数,Al-Cu-Cr系准晶合金的热膨胀系数比Al-Cu-Fe系低。