Crystallization Kinetics for Synthesis Hyper-Structure in P2O5-ZnO-B2O3-BaO-Al2O3-TiO2 Glass Ceramic Composite

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The nucleation and crystallization kinetics of P2O5-B2O3-ZnO-BaO-Al2O3-TiO2 crystals in bulk glass in which this crystals were found to crystallize in the heating process of the glass, were studied by non-isothermal measurements using differential thermal analysis (DTA). A nucleation rate-temperature was determined by plotting either the reciprocal of the temperature corresponding to the crystallization peak maximum, 1/Tp, or the height of the crystallization peak, (*T)p, as a function of nucleation temperature, Tn. The temperature where nucleation can occur for this glass ranges from 700°C to 890°C and the temperature for maximum nucleation is 760±5°C. The correct activation energy for crystallization, Ec, for this glass is the same for surface and/or bulk crystallization, and is 533±15°CkJ/mol. The analysis of the crystallization data with the Kissinger equation and the Marotta equation yields the correct value for Ec only crystal growth occurs on a fixed number of nuclei. The crystallization process of a sample heat treated at the temperature of the maximum nucleation rate was fitted to kinetic equations with an Avrami constant, n ≈2 and a dimensionality of crystal growth, m ≈2.

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Edited by:

Byungsei Jun, Hyungsun Kim, Chanwon Lee, Soo Wohn Lee

Pages:

153-156

Citation:

Y. S. Kim et al., "Crystallization Kinetics for Synthesis Hyper-Structure in P2O5-ZnO-B2O3-BaO-Al2O3-TiO2 Glass Ceramic Composite ", Materials Science Forum, Vol. 569, pp. 153-156, 2008

Online since:

January 2008

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$38.00

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[2] 1.

[1] 8.

[1] 7.

[2] 1.

[1] 8.

[1] 7 Table 2. EDS element compositions of sample at heat treat ment condition 890 °C for 1h A spherical shape (A) A needle shape (B) ele me nt wt% at% wt% at% O Al P Ti Zn.

[30] 03.

[27] 28.

[27] 51.

[1] 91.

[13] 28.

[46] 7.

[25] 15.

[22] 1.

99.

[5] 05.

[31] 8.

[6] 56.

[32] 36.

[29] 28.

[59] 82.

[6] 37.

[20] 33.

[13] 48.