TY - JOUR
T1 - Thermal properties and glass formation in the SiO2-B 2O3-Bi2O3-ZnO quaternary system
AU - Dyamant, Itay
AU - Itzhak, David
AU - Hormadaly, Jacob
N1 - Funding Information:
The authors wish to thank the technical staff of the Zandman Center for Thick-Film Microelectronics. This work was partially supported by a scholarship from PBC–NRCN (Planning and Budgeting Committee, the Council for Higher Education in Israel, and Nuclear Research Center – Negev).
PY - 2005/11/1
Y1 - 2005/11/1
N2 - Lead-free glasses in the SiO2-B2O3-Bi 2O3-ZnO quaternary system were studied. The glass formation region, as determined by XRD patterns of bulk samples, was limited to glasses having more than 40 mol% of the glass-forming oxides SiO2 and B2O3. Crystalline phases of Zn2SiO4 (willemite) were detected in compositions of 30SiO2 • 10B 2O3 • 20Bi2O3 • 40ZnO and 20SiO2 • 10B2O3 • 25Bi 2O3 • 45ZnO. Glass transition temperatures (T g), dilatometric softening points (Td) and linear coefficients of expansion in the temperatures range of 25-300 °C (α25-300) were measured for subsystems along the B 2O3 join of 10, 20 and 30 mol%. For these subsystems, Tg ranged from 411 to 522 °C, and Td ranged from 453 to 563 °C, both decreasing with increasing Bi2O3 content. The measured α25-300 ranged from 53 to 95 × 10-7 °C-1, with values increasing with increasing Bi2O3 content. The ZnO content had the opposite effect to the Bi2O3 content. It appears that Bi3+ acts as a glass-modifier in this quaternary system.
AB - Lead-free glasses in the SiO2-B2O3-Bi 2O3-ZnO quaternary system were studied. The glass formation region, as determined by XRD patterns of bulk samples, was limited to glasses having more than 40 mol% of the glass-forming oxides SiO2 and B2O3. Crystalline phases of Zn2SiO4 (willemite) were detected in compositions of 30SiO2 • 10B 2O3 • 20Bi2O3 • 40ZnO and 20SiO2 • 10B2O3 • 25Bi 2O3 • 45ZnO. Glass transition temperatures (T g), dilatometric softening points (Td) and linear coefficients of expansion in the temperatures range of 25-300 °C (α25-300) were measured for subsystems along the B 2O3 join of 10, 20 and 30 mol%. For these subsystems, Tg ranged from 411 to 522 °C, and Td ranged from 453 to 563 °C, both decreasing with increasing Bi2O3 content. The measured α25-300 ranged from 53 to 95 × 10-7 °C-1, with values increasing with increasing Bi2O3 content. The ZnO content had the opposite effect to the Bi2O3 content. It appears that Bi3+ acts as a glass-modifier in this quaternary system.
UR - http://www.scopus.com/inward/record.url?scp=27344433996&partnerID=8YFLogxK
U2 - 10.1016/j.jnoncrysol.2005.08.031
DO - 10.1016/j.jnoncrysol.2005.08.031
M3 - Article
AN - SCOPUS:27344433996
SN - 0022-3093
VL - 351
SP - 3503
EP - 3507
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 43-45
ER -