A little work has been done for phase separation of nioboborate glasses Recently

by means of SAXS

LAXSand RTFM

the morphology and kinetic characteristcs of the phase separated nloboborate glass have been investigated. The nucleation and growth mechanism have been found with the appearing of the second phase dispersed particles. The growth rule obyes to the diffusion-controled mechanism. The fact of producing the intensive SAXS in glass shows that the difference of electron aensity between the matrix phase and second phase particles is suffcient high. That is attributed to the presence of rich B

2

O

3

and rich Nb

2

O

5

phase in the glass respectively. In this paper a great attention has also been paid to introduce the feature of glass forming and the regularity of the change of optical constant with adding TiO

2

in the nioboborate glasses. Finally

on the basis of experimental results

the structure state of Nb

5+

and Ti

4+

ions in the glasses will be discussed.