Analysis of phonon decay processes in corundum structured <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>α</mml:mi> <mml:mtext>−</mml:mtext> <mml:mrow> <mml:msub> <mml:mi>In</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:msub> <mml:mi mathvariant="normal">O</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>α</mml:mi> <mml:mtext>−</mml:mtext> <mml:msub> <mml:mi>Al</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:msub> <mml:mi mathvariant="normal">O</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> by temperature dependent Raman spectroscopy
Elias Kluth, Josephin E. Müller, R. Goldhahn, Akito Taguchi, Tomohiro Yamaguchi, Martin Feneberg
原始摘要（英文原文）· Original abstract
Temperature dependent Raman spectroscopy was employed on α − In 2 O 3 and α − Al 2 O 3 to determine the phonon decay factors associated with the decay of phonons into two and three phonons. Differently oriented corundum structured α − In 2 O 3 and α − Al 2 O 3 samples were analyzed by temperature dependent Raman spectroscopy between 80 and 300 K. The shift of the resonance frequency of the Raman active phonon modes A 1 g ( 1 ) , E g ( 4 ) , and E g ( 5 ) was investigated by a model function including the thermal expansion of the lattice and the decay of the phonons into two and three phonons with lower energy. We obtain the phonon decay factors A and B representing the decay into two and three phonons, respectively. The findings are in reasonable agreement with the existing literature on α − Al 2 O 3 , α − Ga 2 O 3 , and α − In 2 O 3 .