Li-Concentration Dependence of Micro-Raman Spectra in Ferroelectric-Semiconductor Zn_<1-x>Li_xO
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概要
- 論文の詳細を見る
Optical phonons of the ferroelectric-semiconductor Zn_<1-x>Li_xO ceramics have been studied for several Li-concentrations as a function of temperature by using a micro-probed Raman scattering. With Li-doping, the Raman peak position of the A_1(z) mode at 380cm^<-1> shifts to a lower frequency side while the E_2 mode at 437cm^<-1> not show the Li-dependence. The generalized force constant of A_1 (z) mode is obtained as a function of Li-concentration. The Li-dependence of the Raman peak positions are well explained by the change of electronic bonding force between nearest two atoms. Because the drastic phonon anomaly was not observed, it suggests that the ferroelectric-phase transition in Zn_<1-x>Li_xO is caused by the electronic effect rather than by the ionic instability. In addition, it is found that the Raman peak position is proportional to the lattice constant in the wide temperature region.
- 社団法人日本物理学会の論文
- 2002-06-15
著者
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Onodera Akira
Department of Physics, Faculty of Science, Hokkaido University
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Sakai A
Deportment Of Electrical And Electronic Engineering Muroran Institute Of Technology
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ISLAM Ehtesanul
Deportment of Electrical and Electronic Engineering, Muroran Institute of Technology
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SAKAI Akira
Deportment of Electrical and Electronic Engineering, Muroran Institute of Technology
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Onodera Akira
Department Of Molecular Life Science Tokai University School Of Medicine
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Islam Ehtesanul
Deportment Of Electrical And Electronic Engineering Muroran Institute Of Technology
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Sakai A
Department Of Hematology And Oncology Division Of Clinical Research Research Institute For Radiation
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