Subsolidus phase relations in the system ZnO–B2O3–V2O5

Abstract

a b s t r a c tThe subsolidus phase relations of the ternary system ZnO-B 2 O 3 -V 2 O 5 were investigated by means of X-ray diffraction (XRD). There is no ternary compound in the system. There are seven binary compounds which have been reported in the ZnO-B 2 O 3 -V 2 O 5 system, which can be divided into eight 3-phase regions. The phase diagram of Zn 4 V 2 O 9 -Zn 3 B 2 O 6 pseudo-binary system from 740 • C to 1250 • C has also been constructed through XRD and differential thermal analysis (DTA) methods, and the result reveals this system is eutectic system. The eutectic temperature is 780 • C and eutectic point comprises 55% Zn 4 V 2 O 9 and 45% Zn 3 B 2 O 6 . The mixture with the composition near the eutectic point might be the suitable flux for ZnO crystal growth.

Rare Earth FreeZn3V2O8Phosphor with Controlled Microstructure and Its Photocatalytic Activity

“…Kurzawa and Bosacka also reported the existence of and forms of Zn 3 V 2 O 8 , the former being the low temperature form and the latter the high temperature form and the transition temperature being 795 ∘ C [23]. Its lattice parameters observed from the XRD analysis are = 8.298Å, = 8.34Å, = 6.11Å, and = 111.5 ∘ , which is in accordance with a previous report [24]. According to Zhang et al, pure phase of Zn 3 V 2 O 8 is formed from the stoichiometric mixture of high purity ZnO and V 2 O 5 heated above 700 ∘ C for 12 h.…”

“…Further, flux is the substance which facilitates the growth of crystals at relatively low sintering condition favorable for the PL emission. However, excess of H 3 BO 3 flux actively participates in the reaction with the host composition, especially, vanadium, and generates Zn 3 B 2 O 6 and other Zn-borates [24]. These impurity phases lower the PL intensity of the Zn 3 V 2 O 8 phosphor.…”

Autonomic Self‐Repairing Glassy Materials

“…[ 27 ] We notice that no reaction between B 2 O 3 and V 2 O 5 is observed by NMR spectroscopy, as mentioned in the literature. [ 28 ] Our results show that vanadium boride can be used as a healing agent for glasses or glass-ceramics with a T g or softening temperature higher than 700 ° C. We demonstrated the effi ciency of the self-healing by an in situ observation using environmental scanning electron microscopy (ESEM). Figure 4 shows both a so-called "healing ratio" and photomicrographs recorded in situ during heat treatment at 700 ° C for 0, 20, 40, and 60 minutes.…”

Phase Relations in Ternary Systems in the Subsolidus Region: Methods To Formulate Solid Solution Equations and To Find Particular Compositions

“…The stable phases are always those in the corners of the triangle. Many three-phase areas can be found in the phase diagrams reported by Xue and co-workers, 50,51 Shi et al, 52 and Zhan et al 53 An excellent example of applied phase diagrams research, in which almost all of the features described here are present, is the ternary system studied by Harvey et al, 54 and its importance related to physical properties is cited later in the review article by Hoel et al 55 ■ DETERMINATION OF BINARY AND TERNARY…”