Electronic polarizability and interaction parameter of gadolinium tungsten borate glasses with high WO3 content

Features of electronic polarizability and approach to unique properties in tellurite glasses

“…B 2 O 3 is a typical acidic oxide, and, furthermore, it is known that B 2 O 3 forms glasses with other basic oxides such as BaO, La 2 O 3 , and Bi 2 O 3 . Taki et al confirmed a linear relationship between ∧( n o ) and A ( n o ) in various binary B 2 O 3 ‐based glasses as shown in Figure . The data for Na 2 O‐SiO 2 , Na 2 O‐GeO 2 , and Na 2 O‐TeO 2 glasses shown in Table are added in Figure , lying in a linear relationship observed in binary B 2 O 3 ‐based glasses.…”

“…In contrast, the low value of A ( n o ) = 0.034 Å −3 for TeO 2 oxide suggests weak chemical bond strengths in Te‐O‐Te bonds, that is, a small overlap (ionic character) between O2p and Te valence orbitals. A good linear correlation between refractive index‐based optical basicity and interionic interaction parameter has been demonstrated in glasses . That is, glasses with large ∧( n o ) values show small A ( n o ) values.…”

“…The data for pure TeO 2 glass are also shown in Figure . For comparison, the values of A ( n o ) and ∧( n o ) for ternary Gd 2 O 3 ‐WO 3 ‐B 2 O 3 and ZnO‐Bi 2 O 3 ‐B 2 O 3 glasses reported previously are also included in Figure . The former glasses include WO 3 as similar to K 2 O‐WO 3 ‐TeO 2 glasses, and the later glasses contain Bi 2 O 3 known as a key oxide for the enhancement of low melting and large electronic polarizabilities .…”

“…The values of T g for ternary tellurite glasses shown in Table are plotted against the values of A ( n o ) in Figure . The data for ternary Gd 2 O 3 ‐WO 3 ‐B 2 O 3 and ZnO‐Bi 2 O 3 ‐B 2 O 3 glasses are also shown in Figure for comparison. As seen in Figure , SiO 2 ‐ and B 2 O 3 ‐based glasses with no TeO 2 have a strong compositional dependence, resulting in a wide range of T g values.…”

“…Relationship between interionic interaction parameter A ( n o ) and glass transition temperature T g for ternary tellurite glasses (Table ). The data for ternary Gd 2 O 3 ‐WO 3 ‐B 2 O 3 and ZnO‐Bi 2 O 3 ‐B 2 O 3 glasses are also included. The solid line is guides for the eyes…”