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Coarsening kinetics in demixed lead borate melts
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10.1063/1.4808162
/content/aip/journal/jcp/138/22/10.1063/1.4808162
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/22/10.1063/1.4808162

Figures

Image of FIG. 1.
FIG. 1.

Miscibility gap in the PbO-BO system. Data according to different authors as indicated. Binodal temperatures (solid line) were fitted using the modified regular solution model of Simmons, the critical temperature (1058 K ), and the equilibrium compositions BO and PbO·4BO. Reduced mixing entropy (Δ/ = 7.2 ± 0.3) was adjusted to obtain the best line through the data. The liquidus temperature = 1015 K (dashed-dotted line) was redrawn from Geller and Bunting. The dashed lines illustrate the best straight lines through the data of the transition temperature of the BO-rich and PbO-rich glasses.

Image of FIG. 2.
FIG. 2.

Absorption in the near infrared region of demixed PB1 and PB2 glasses.

Image of FIG. 3.
FIG. 3.

Secondary electron images of relict structures of demixed drops in lead borate glass matrix. Distribution of drop ovality (a) in uncompressed glass PB2 after dwelling at 723 for 2 h (c). Distribution of drop ovality (b) in compressed ( = 0.131 MPa) glass PB2 after dwelling at 769 K and cooling under load (d).

Image of FIG. 4.
FIG. 4.

Size distribution of drops of the demixed glass PB1 after heat treatment at 773 K for 4 h. Mean radius is determined from fitting a Gaussian function through the data. (Inset) Mean radius cubed vs. coarsening time . Straight line displays best fit through the data.

Image of FIG. 5.
FIG. 5.

Viscosity as a function of temperature of demixed glass PB2 and homogeneous glass PB3. Viscosity temperature curve of pure boron trioxide glass from Dietzel and Brückner.

Image of FIG. 6.
FIG. 6.

Diffusivity vs. viscosity in the PbO-BO glass system using double logarithmic scales. Data: = Diffusivity of the coarsening process (Eq. (10) ) and viscosity of matrix glass (Fig. 5 ) in demixed PB1 glass ( = 82.2 mol. %); O self-diffusivity and viscosity in boron trioxide glass ( ≈ 100 mol. %); O self-diffusivity and viscosity in PbO-rich lead borate glass ( = 31 mol. %); Pb self-diffusivity and viscosity in lead diborate glass ( = 66.7 mol. %). Eyring diffusivity calculated using Eqs. (7) and (8) for (1 + ) = 1.004, 2, 10, and 100 species per activated complex and ( /( )) = 240 pm. Upper x-coordinate scales diffusivity with the relative temperature / of the matrix glass of the demixed PB1 and PB2 glasses ( = 706 K).

Tables

Generic image for table
Table I.

Density , composition of the initial supersaturated glasses PB1, PB2, and the homogeneous glass PB3, drop fraction , BO content of drop and matrix in phase separated glasses PB1 and PB2 after dwelling at temperatures in the range from 723 to 773 K load-free (coarsening regimes) and under load (compression experiments under axial compressive stress ), effective strain rate , drop ovality and liquid-liquid interfacial energy . Number in parenthesis gives uncertainty of the last digit.

Generic image for table
Table II.

Diffusivity in PbO-BO glasses at 773 and 723 K. Data: Coarsening (Eq. (10) ) in demixed PB1 glass ( = 82.2 mol. %); O self-diffusivity in boron trioxide glass ( = 100 mol. %); O self-diffusivity PbO-rich lead borate glass ( = 31 mol. %); Pb self-diffusivity in lead diborate glass ( = 66.7 mol. %). Eyring diffusivity of matrix glass in demixed PB1 and PB2 glasses was calculated using Eqs. (7) and (8) with = 1 and ( /( )) = 240 pm. Number in parenthesis gives uncertainty of the last digit.

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/content/aip/journal/jcp/138/22/10.1063/1.4808162
2013-06-10
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Coarsening kinetics in demixed lead borate melts
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/22/10.1063/1.4808162
10.1063/1.4808162
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