Temperature Correction for Ceramic Powder X-Ray Diffraction at a Higher Temperature

Abstract:

For powder XRD measurement at a higher temperature, there is a great difference (ΔT) between the temperature (T) detected by a thermocouple in a specimen stage and the actual temperature (T_a) of the ceramic powder surface irradiated by X-ray. The BaTiO₃ ceramic powder was employed to make an temperature correction on heating in light of the change of the ~ 45º characteristic peak in the vicinity of its tetragonal-cubic phase transition point (T_C = 130 °C). The thermal relaxation of BaTiO₃ is considered. When the BaTiO₃ ceramic powder was measured at T_C, the phase transition occurred at T = 170 °C and ΔT was determined as 40 °C, which is 10 °C higher than that of the ceramic bulk. The error of temperature correction is less than ± 3 °C at T_C. The approximation of a linear dependency T_a - T was given as a temperature correction line between 25 and 130 °C (T_a here).

• Periodical: Advanced Materials Research (Volumes 718-720)
• Pages: 768-772
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.718-720.768
• Online since: July 2013
• Authors: Da Yong Lu, Wei Cheng, Peng Yuan Chen, Xiu Yun Sun
• Keywords: Differential Scanning Calorimetry (DSC), Electron Paramagnetic Resonance (EPR), Powder X-Ray Diffraction at Different Temperatures, Raman Spectroscopy, Temperature Correction, Thermal Relaxation

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