| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Optical Properties and Photocatalytic Activity of Marokite-Type CaMn2O4 |
| WU Xue-Wei, ZHANG Hai-Xin, LIU Xiao-Jun**, ZHANG Xing-Gan**
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Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093
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WU Xue-Wei, ZHANG Hai-Xin, LIU Xiao-Jun et al 2011 Chin. Phys. Lett. 28 107101 |
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Abstract The optical properties and electronic structure of marokite-type CaMn2O4 are investigated by using UV−vis spectroscopy and the local-spin-density approximation plus the Hubbard-U (LSDA+U) method. Four absorption bands are observed at 638 nm (1.94 eV), 512 nm (2.42 eV), 377 nm (3.29 eV) and 248 nm (5.00 eV), which are ascribed to the charge transfer transitions O2p↑→Mn3d eg↑, O2p↓→Mn3d eg↑, Mn3d eg↑→Mn3d t2g ↓ and O2p↑→Mn3d t2g↓, respectively. We further use CaMn2O4 as a photocatalyst to decompose an azo-dye acid orange 7 (AO7) under irradiation of visible light and find that the decomposition ratio of AO7 reaches 15.9% under the irradiation of visible light for two hours.
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| Keywords:
71.27.+a
71.20.Mq
78.40.Fy
82.50.Hp
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Received: 19 April 2011
Published: 28 September 2011
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| PACS: |
71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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71.20.Mq
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(Elemental semiconductors)
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78.40.Fy
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(Semiconductors)
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82.50.Hp
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(Processes caused by visible and UV light)
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[1] Iliev M N et al 2003 Phys. Rev. B 67 212301
[2] Okimoto Y et al 2002 Appl. Phys. Lett. 80 1031
[3] Shen Y et al 2002 J. Phys. Chem. Solids 63 947
[4] Ouyang S X et al 2006 J. Phys. Chem. B 110 11677
[5] Ahuja S and Kutty T R N 1996 J. Photochem. Photobiol. A 97 99
[6] Kato H and Kudo A 2003 Catal. Today 78 561
[7] Wang D F et al 2003 Chem. Phys. Lett. 373 191
[8] Saadi S et al 2006 Renew. Energ. 31 2245
[9] Kale B B et al 2006 Adv. Funct. Mater. 16 1349
[10] Vajifdar K J et al 2007 Chem. Eng. Technol. 30 474
[11] Jin S et al 1994 Science 264 413
[12] Yamashita M et al 2004 J. Non-Cryst. Solids 333 37
[13] Jung J H et al 1998 Phys. Rev. B 57 R11043
[14] Grenier S et al 2005 Phys. Rev. Lett. 94 047203
[15] Kim K J and Park Y R 2004 J. Cryst. Growth 270 162
[16] Kovaleva N N et al 2002 Physica B 312 737
[17] Yanagisawa O et al 2000 J. Magn. Magn. Mater. 211 133
[18] Sugaya H et al 2004 Appl. Surf. Sci. 223 68
[19] Tokoro H et al 2007 J. Magn. Magn. Mater. 310 1422
[20] Lin J C et al 1996 J. Catal. 161 659
[21] Cao H and Suib S L 1994 J. Am. Chem. Soc. 116 5334
[22] Bessekhound Y and Trari M 2001 Int. J. Hydrogen Energ. 27 357
[23] Ling C D et al 2001 J. Solid State Chem. 160 167
[24] Zouari S et al 2003 J. Alloy. Compd. 353 5
[25] Giesber H G et al 2001 Inorganic Compounds: Acta Cryst. C 57 329
[26] Spooren J and Walton R I 2005 J. Solid State Chem. 178 1683
[27] Wang Z W et al 2003 J. Solid State Chem. 170 382
[28] Qian Q et al 2003 Phys. Rev. B 68 014429
[29] Anisimov V I and Gunnarsson O 1991 Phys. Rev. B 43 7570
[30] Solovyev I V et al 1994 Phys. Rev. B 50 16861
[31] Kasinathan D et al 2006 Phys. Rev. B 74 195110
[32] Nakamura K et al 2007 Phys. Rev. B 75 205205
[33] Novák P et al 2008 Comput. Mater. Sci. 44 79
[34] Butler M A 1977 J. Appl. Phys. 48 1914
[35] Yang Z Q et al 1999 Phys. Rev. B 60 15674
[36] Qian M C et al 2000 Phys. Lett. A 270 96
[37] Satpathy S et al 1996 J. Appl. Phys. 79 4555
[38] Zaanen J et al 1985 Phys. Rev. Lett. 55 418
[39] Lea J and Adesina A A 1998 J. Photochem. Photobio. A 118 111
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