Effect of Phase Transition on the Optical Absorption Edge and Electronic States in Ferroelectric Materials of (CH_3NH_3)_3M_2Br_9(M:Sb,Bi)

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概要

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• VX'e [42lX'(2 naeasttred Cl',e teuaaperstture depetadezuce of the atbsorption spectra in the lcand-edgeregron atad the reflection spectrzt of' the (CH3NH3)3.NIzBrg (Nl:Sb,Bi) sirxgle crystals exhiloit-ing serveral successive plaase transitioras. Tlne dispersion-like reflection strtrcttrre dtre to the].catud-edge exciton Iran,'sitioza is oloserved ?rt 2.92eV ?tnd 2.95eV ['or (CH3NH3)3BizBrg ?tnd(CH3NH3)3SbzBrg, respectix'el)z. Tlae r'eflection strttcttrre retaaains ex'eta at I'OO111 teunperattrrereflecting a Jar'ge loindizug ezuergy. Tlue f'tnndataaental absorption edge in botlt cr'ysta,Is jcossesses anexpozaezatial shetpe folloxving the etaapirical Urbacla rtrle. Tlae steepness coefficients cl'n?xracterizinga bro?adening of tlae a1.csorption edge exhilcit 21 distinct .jtrnap at the phase transition tenaperaLure, The resttlts indicstte tlaat tlae ordering of' orientatio?t?rl taaotion of naetlaylatuaraaonitruaa catiotasclaanges not only tlae crystttl strtrcttrre atad dielectric properties but 2llSO tl?e Urbach tail ira bothcrystals.

• 社団法人日本物理学会の論文
• 1999-08-15

著者

• IWATA Makoto

  Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya

• Kawai T

  Tokyo Univ. Sci. Tokyo

• 佐々木 茂男

  九州大学院理

• Iwata Makoto

  Department Of Applied Physics School Of Engineering Nagoya University

• Ishibashi Yoshihiro

  Business Communication Research Institute Aichi Shukutoku University

• Miyashita A

  School Of Pharmaceutical Sciences University Of Shizuoka

• Miyashita Akira

  Department of Fixed Prosthodontics, School of Dental Medicine, Tsurumi University

• Miyashita A

  Department Of Applied Chemistry Faculty Of Engineering Saitama University

• Miyashita Akira

  Department Of Applied Physics School Of Engineering Nagoya University

• Shimanuki Shigetaka

  Department Of Natural Science Osaka Women's University

• KAWAI Taketoshi

  Department of Natural Science,Osaka Women's University

• TAKAO Emi

  Department of Environmental Sciences,Faculty of Science,Osaka Women's University

• Takao Emi

  Department Of Environmental Sciences Faculty Of Science Osaka Women's University

• Miyashita Akira

  Department Of Applied Chemistry Faculty Of Engineering Saitama University

• Ishibashi Y

  Takeda Pharmaceutical Company Ltd.

• Kawai Taketoshi

  Deparment Of Environmental Sciences Faculty Of Science Osaka Women's University

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