Crystallisation behaviour of CaO-M2O3-SiO2 glasses (M=La, Y, In, Ga) is studied using a recently proposed dimensionless parameter, which can be easily calculated from thermoanalytical data. This parameter proves useful in comparing the stability of glass toward crystallisation. The stability to crystallisation increases as M2O3 is substituted for CaO. Moreover, the higher the ionic field strength, Z/R-2, of the substituting cation, the greater the effect. This can be ascribed to: (a) the decrease in density of nonbridging oxygens when a network former oxide (Al2O3, Ga2O3) is introduced (Z/R-2 > 5 Angstrom(-2)); (b) the increase of the transverse bond strength (the greater the higher the ionic field strength of the cation) when a network modifier oxide is introduced (Z/R-2 < 5 Angstrom(-2)).

EFFECT OF CHANGING THE SUBSTITUENT OXIDE AND ITS AMOUNT ON THE THERMAL STABILITY TOWARDS CRYSTALLIZATION OF GLASSES OF FORMULA (2.5-X)CaOX/3M2O32SiO2 (M= La, Y, IN, Ga) / Branda, Francesco; Costantini, Aniello; Luciani, Giuseppina; Silvestri, Brigida. - In: PHYSICS AND CHEMISTRY OF GLASSES. - ISSN 0031-9090. - ELETTRONICO. - 45 (2):(2004), pp. 95-96.

EFFECT OF CHANGING THE SUBSTITUENT OXIDE AND ITS AMOUNT ON THE THERMAL STABILITY TOWARDS CRYSTALLIZATION OF GLASSES OF FORMULA (2.5-X)CaOX/3M2O32SiO2 (M= La, Y, IN, Ga)

BRANDA, FRANCESCO;COSTANTINI, ANIELLO;LUCIANI, GIUSEPPINA;SILVESTRI, BRIGIDA
2004

Abstract

Crystallisation behaviour of CaO-M2O3-SiO2 glasses (M=La, Y, In, Ga) is studied using a recently proposed dimensionless parameter, which can be easily calculated from thermoanalytical data. This parameter proves useful in comparing the stability of glass toward crystallisation. The stability to crystallisation increases as M2O3 is substituted for CaO. Moreover, the higher the ionic field strength, Z/R-2, of the substituting cation, the greater the effect. This can be ascribed to: (a) the decrease in density of nonbridging oxygens when a network former oxide (Al2O3, Ga2O3) is introduced (Z/R-2 > 5 Angstrom(-2)); (b) the increase of the transverse bond strength (the greater the higher the ionic field strength of the cation) when a network modifier oxide is introduced (Z/R-2 < 5 Angstrom(-2)).
2004
EFFECT OF CHANGING THE SUBSTITUENT OXIDE AND ITS AMOUNT ON THE THERMAL STABILITY TOWARDS CRYSTALLIZATION OF GLASSES OF FORMULA (2.5-X)CaOX/3M2O32SiO2 (M= La, Y, IN, Ga) / Branda, Francesco; Costantini, Aniello; Luciani, Giuseppina; Silvestri, Brigida. - In: PHYSICS AND CHEMISTRY OF GLASSES. - ISSN 0031-9090. - ELETTRONICO. - 45 (2):(2004), pp. 95-96.
File in questo prodotto:
File Dimensione Formato  
Phys_chem_glasses_04.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: Accesso privato/ristretto
Dimensione 825.23 kB
Formato Adobe PDF
825.23 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/202870
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 9
  • ???jsp.display-item.citation.isi??? 9
social impact