BaO-B2O3-GeO2(BaO≤50 mo1％)三元系相图的研究

本文用X射线衍射及差热分析等方法, 研究了BaO-B_2O_3-GeO_2(BaO≤50 mol％)三元系的室温截面相图。发现了一个新的三元化合物Ba_3B_6Ge_2O_(16)(3BaO·3B_2O_3·2GeO_2)。并且研究了BaB_2O_4-Ba_3B_6Ge_2O_(16), BaGeO_3-Ba_3B_6Ge_2O_(16), BaB_2O_4-BaGeO_3三个二元系相图。它们都是共晶体系, 共晶温度分别为937±3 ℃、879±3 ℃875±3 ℃; 共晶组分分别为(BaO)_(0.42)(B_2O_3)_(0.42)(GeO_2)_(0.16), (BaO)_(0.42)(B_2O_3)_(0.24)(GeO_2)_(0.34), (BaO)_(0.50)(B_2O_3)_(0.27)(GeO_2)_(0.23)。这三个二元系组成一个三元共晶体系, 其三元共晶温度为870±3 ℃, 共晶组分为(BaO)_(0.46)(B_2O_3)_(0.27)(GeO_2)_(0.27)。

INVESTIGATION OF TERNARY SYSTEM BaO-B2O3-GeO2 (BaO≤50 mol%)

The ternary system BaO-B_2O_3-GeO_2 (BaO≤50 mol%) has been investigated by means of X-ray diffraction and DTA techniques, The phase diagram of the room temperature section of BaO-B_2O_3-GeO_2 (BaO≤50 mol%) system has been established and a new ternary compound Ba_3B_6Ge_2O_(16)(3BaO·3B_2O_3·2GeO_2) has been found. The phase diagrams of the pseudo-binary system in this ternary system: BaB_2O_4-BaGeO_3; BaB_2O_4-Ba_3B_6Ge_2O_(16); BaGeO_3-Ba_3B_6Ge_2O_(16) have been studied, all of which are eu- tectic system. The eutectic reactions occur at 875±3 ℃; 937±3 ℃; 879±3 ℃ respectively, and the compositions are (BaO)_(0.50)(B_2O_3)_(0.27)(GeO_2)_(0.23); (BaO)_(0.42)(B_2O_3)_(0.42) (GeO_2)_(0.16); (BaO)_(0.42)(B_2O_3)_(0.24)(GeO_2)_(0.34) respectively. The pseudoternary system BaB_2O_4-BeGeO_3-Ba_3B_6Ge_2O_(16) is also a eutectic system. The ternary eutectic temperature is 870±3 ℃ and the composition is (BaO)_(0.46)(B_2O_3)_(0.27)(GeO_2)_(0.27).