Akademik Veri Yönetim Sistemi
JOURNAL OF NON-CRYSTALLINE SOLIDS, cilt.353, sa.44-46, ss.4195-4198, 2007 (SCI-Expanded)
To investigate temperature dependence of paracrystallinity for opal-CT, a bentonite containing approximately 34% by mass opal-CT have been used as material. Since opal-CT can not be separated entirely, the bentonite samples have been heated at different temperatures in the interval from 200 degrees C to 1300 degrees C for 2 h, and at 1050 degrees C for different time intervals changing from 2 It to 24 h. The X-ray diffraction (XRD) patterns of the original and heated samples have been obtained. The increase in the paracrystallinity has been discussed according to the thermal behavior of the relative intensity (I/I-0), relative full width at half-maximum peak height (FWHM/FWHM0 W and d-value of the most characteristics XRD peak for opal-CT between 0.405 nm and 0.410 nm region. The increase in 1110 from I to 3, and in d(101) spacing from 0.4050 to 0.4095 and decrease in W from 1 to 0.6 show that there is an increase in paracrystallinity for opal-CT by rising the temperatures between 800 degrees C and 1300 degrees C. The increase, of I/I-0 value from 1 to 5 by heating at 1050 degrees C while time increases from 2 h to 24 h shows that the paracrystallinity of opal-CT increase by time and reaches steady state condition approximately 1300 degrees C. (C) 2007 Elsevier B.V. All rights reserved.