八种新功能晶体的比热及其与相变掺杂物关系的实验研究

Experimental Research on Specific Heat of Eight New Functional Crystals and Relations to Phase Transition and Dopant

本文对八种新型功能晶体Ｌｉ２Ｂ４Ｏ７、Ｂｉ１２ＴｉＯ２０、Ｂｉ１２ＧｅＯ２０、Ｂ１４Ｇｅ３Ｏ１２、Ｓｒ１－ｘＢａｘＮｂ２Ｏ６（ｘ＝０．３３，０．４８）、ＬｉＴａＯ３等在１３０～９７３Ｋ范围内的比热行为及其与相变、组分之间的关系进行了实验研究，给出了比热的多项式拟合方程，并与用纽曼－卡普定律及用Ｗｉｋｅｌｍａｎｎ经验方程的比热计算值作了对比，为晶体比热的估算提供了依据和方法．

In this paper, we report the specific heat of eight new functional crystals: Li2B4O7, Bi12SiO20,Bi12TiO20, Bi12GeO20, Bi4Ge3O20, Sr1-xBaxNb2O6(x=0.33, 0.48), LiTaO3 in the temperature range of 130～973K, together with the relations to phase transition and chemical components. The polynomial fitting equations of sp. heat are given. The results are also compared with the calculated values from Kopp- Neumann law and Winkelmann's empirio equation. This has provided a method and evidence for the estimation of crystal's specific heat.