TY - JOUR
T1 - Role of fluorine in the devitrification of SiO2·Al2O3·P2O5·CaO·CaF2 glasses
AU - Stanton, Ken
AU - Hill, Robert
PY - 2000
Y1 - 2000
N2 - A series of eight glasses based on a glass system with the generic composition 1.5(5-Z)SiO2·(5-Z) Al2O3·1.5P2O5·(5-Z)CaO·ZCaF2 were studied where Z = 2, 1.75, 1.5, 1.25, 1, 0.5, 0.25, 0. These glasses were characterized using differential scanning calorimetry (DSC) and x-ray powder diffraction (XRD). Glasses with high fluorine contents were found to crystallize readily to fluorapatite via a homogeneous nucleation route probably involving prior amorphous phase separation. These results are explained in terms of an approach which views glasses as being inorganic polymers where the presence of fluorine disrupts the glass network and thereby reduces the energy barrier to homogeneous nucleation and crystallization of fluorapatite.
AB - A series of eight glasses based on a glass system with the generic composition 1.5(5-Z)SiO2·(5-Z) Al2O3·1.5P2O5·(5-Z)CaO·ZCaF2 were studied where Z = 2, 1.75, 1.5, 1.25, 1, 0.5, 0.25, 0. These glasses were characterized using differential scanning calorimetry (DSC) and x-ray powder diffraction (XRD). Glasses with high fluorine contents were found to crystallize readily to fluorapatite via a homogeneous nucleation route probably involving prior amorphous phase separation. These results are explained in terms of an approach which views glasses as being inorganic polymers where the presence of fluorine disrupts the glass network and thereby reduces the energy barrier to homogeneous nucleation and crystallization of fluorapatite.
UR - http://www.scopus.com/inward/record.url?scp=0033878574&partnerID=8YFLogxK
U2 - 10.1023/A:1004710301219
DO - 10.1023/A:1004710301219
M3 - Article
AN - SCOPUS:0033878574
SN - 0022-2461
VL - 35
SP - 1911
EP - 1916
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 8
ER -