Based on the experimental results of high temperature IR spectra

high temperature Raman spectra

high temperature micropolariscope

RDF (r) and DSC-7 differential thermal analysis etc.

the structure and properties of glass melts in the Nb

2

O

5

-B

2

O

3

-K

2

O system have been investigated. By comparing the structure of high temperature glass melts and the structure of glass in room temperature of Nioboborate and Borate

we found out that the B

Ⅲ

-O-B

Ⅳ

bond of borate glass isalarge σ bond(poor of electron) and is very unsteady. When intr-oducing Nb

2

O

5

into borate glass

the B

Ⅳ

-O-Nb bond is produced in glass as the Nb

2

O

5

content increases. Because the quantity of circuit structure increases gradually

so the glass stabitity and mechanic properties of glass are improved. Further more

the relationship between crystallo-velocity and the temperature

glass melts structure etc.