Acta Phys. -Chim. Sin. ›› 1987, Vol. 3 ›› Issue (05): 508-513.doi: 10.3866/PKU.WHXB19870512

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Liang Jingkui; Chai Zhang; Zhang Jinping   

  1. Institute of Physics Academia Sinica; Graduate School of USTC Academia Sinica; Nanjing Normal University
  • Received:1986-05-26 Revised:1987-01-20 Published:1987-10-15

Abstract: 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).