Avrami exponent of crystallization in tellurite glasses

被引：14

作者：

Sidel, S. M. ^{[1
,2
]}

Santos, F. A. ^{[1
]}

Gordo, V. O. ^{[1
]}

Idalgo, E. ^{[1
]}

Monteiro, A. A. ^{[1
]}

Moraes, J. C. S. ^{[1
]}

Yukimitu, K. ^{[1
]}

机构：

[1] UNESP Univ Estadual Paulista, Fac Engn, Ilha Solteira, SP, Brazil

[2] UFT Univ Fed Tocantins, Palmas, TO, Brazil

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2011年 / 106卷 / 02期

关键词：

Tellurite glasses; Nucleation; Crystallization; Activation energy; XRD; DSC; NONISOTHERMAL CRYSTALLIZATION; 20LI(2)O-80TEO(2) GLASS; CHALCOGENIDE GLASSES; ACTIVATION-ENERGY; CRYSTAL-STRUCTURE; THERMAL-ANALYSIS; KINETICS; NUCLEATION; TEMPERATURE; GROWTH;

D O I：

10.1007/s10973-011-1312-4

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Nucleation process and crystal growth for three samples of the (20-x)Li(2)O-80TeO(2)-xWO(3) glass system were studied using X-ray diffraction and differential scanning calorimetry techniques. X-ray diffraction data confirmed the amorphous characteristic of the as-quenched samples and indicated the growth of crystalline phases formed due to the thermal treatment for annealed samples. These results reveal the presence of three distinct gamma-TeO(2), alpha-TeO(2) and alpha-Li(2)Te(2)O(5) crystalline phases in the TL sample, and two distinct alpha-TeO(2) and gamma-TeO(2) crystalline phases in the TLW5 and TLW10 samples. The activation energy and the Avrami exponent were determined from DSC measurements. The activation energy values X-ray diffraction data of the TLW10 glass sample suggest that gamma-TeO(2) phase occur before the alpha-TeO(2). The results obtained for the Avrami exponent point to that the nucleation process is volumetric and that the crystal growth is two or three-dimensional.

引用

页码：613 / 618

页数：6

共 37 条

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