Growth-front hopping via stress-induced nucleation illustrated for the crystallization of Ba1-xSrxZn2Si2O7 from a glass in the BaO-SrO-ZnO-SiO2 system

Solid solutions based on BaZn2Si2O7 with thermal expansions from negative to highly positive – a review

“…18 shows an SEM micrograph of a sample with the composition 9.4 BaO·9.4 SrO·37.6 ZnO·37.6 SiO 2 ·4 P 2 O 5 ·2 Ce 2 O 3 which is equal to 18.8 (Ba 0.5 Sr 0.5 Zn 2 Si 2 O 7 )·4 P 2 O 5 ·2 Ce 2 O 3 . 65 The addition of P 2 O 5 and Ce 2 O 3 to the stoichiometric compound obviously extends the glass forming range notably. During thermal treatment at 690 °C for 20 h and subsequently at 850 °C for 1 h, first surface crystallization of Ba 0.5 Sr 0.5 Zn 2 Si 2 O 7 , Zn 2 SiO 4 , and CeO 2 can be observed.…”

“…As oxidic nucleation agents, comparatively high ZrO 2 concentrations of ≥6 mol% can be used. 62,63 Additionally, P 2 O 5 64 , both P 2 O 5 and Ce 2 O 3 65 , WO 3 66 and Ta 2 O 5 67 were reported to act as nucleation agents. It should be noted that the oxidic nucleation agents up to now reported in the literature for these glass systems are by far not as effective as the noble metals.…”

“…As oxidic nucleation agents, comparatively high ZrO 2 concentrations of ≥6 mol% can be used. 62,63 Additionally, P 2 O 5 , 64 both P 2 O 5 and Ce 2 O 3 , 65 WO 3 (ref. 66) and Ta 2 O 5 (ref.…”