Characterization of Electrically Conductive Vanadate Glass Containing Tungsten Oxide
Characterization of Electrically Conductive Vanadate Glass Containing Tungsten Oxide
复制标题
含氧化钨的导电钒酸盐玻璃的表征
DOI：
10.1007/s10967-012-1887-7
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
H. Masuda and T. Nishida
中科院分区：
文献类型：
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作者：
S. Kubuki;H. Masuda and T. Nishida
采用Mössbauer光谱法研究了20BaO·10Fe2O3·xWO3·（70−x）V2O5（x= 10-50）的新型导电玻璃。在500℃等温退火1000 min后，由于FeO4、VO4和vo5单元组成的3d网络的结构松弛，四极杆分裂（Δ）明显减少。等温退火后，当x = 10时，材料的电导率σ从1.7 × 10−5显著增加到1.0 × 10−1S cm−1，而当x = 40时，材料的电导率σ值为1.1 × 10−4和2.0 × 10−4S cm−1。这些结果表明，随着σ值的显著增加，三维网络结构的弛豫是“钒酸盐玻璃”所固有的。x = 20的玻璃样品在500℃退火1000 min后，XRD谱图显示出针状的bafe2o4和α- fe2o3形成的几个弱峰。SEM研究表明，bafe2o4仅在试样表面形成针状，而在x = 40的退火试样中则形成六边形的bafe12o19。通过将每个玻璃样品浸泡在20% -HCl溶液中72 h，研究了含wo3钒酸盐玻璃的化学耐久性。
New conductive glass with a composition of 20BaO·10Fe2O3·xWO3·(70 −x)V2O5(x= 10–50) was investigated by means of Mössbauer spectroscopy. A marked decrease in quadrupole splitting (Δ) was observed after the isothermal annealing at 500 °C for 1,000 min, due to the structural relaxation of 3D-network composed of FeO4, VO4, and VO5units. After the isothermal annealing, a marked increase in the electrical conductivity (σ) was observed from 1.7 × 10−5to 1.0 × 10−1S cm−1when “x” was 10, whereas comparableσvalues of 1.1 × 10−4and 2.0 × 10−4S cm−1were observed when “x” was 40. These results evidently show that structural relaxation of 3D-network structure involved with a marked increase inσis intrinsic of “vanadate glass”. XRD pattern indicated several weak peaks due to needle-like BaFe2O4and α-Fe2O3when the glass sample with “x” of 20 was annealed at 500 °C for 1,000 min. SEM study proved the formation of needle-like BaFe2O4just on the surface of the sample, whereas hexagonal BaFe12O19were observed in the annealed sample with “x” of 40. Chemical durability of WO3-containing vanadate glass was investigated by immersing each glass sample into 20 %-HCl solution for 72 h.