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Preparation and Characteristization of Zinc and Molybdenum Diluted Magnetic Semiconductor Compound

Author: ChenXiuYing
Tutor: HuoGuoYan
School: Hebei University
Course: Materials Physics and Chemistry
Keywords: ZnO Diluted magnetic semiconductor Ferromagnetic Sol - gel method
CLC: TN304.2
Type: Master's thesis
Year: 2008
Downloads: 3
Quote: 0
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Abstract


In this paper, the sol - gel method introduced in the ZnO semiconductor transition metal elements Co and Mo, a preliminary study on the structure and magnetic behavior of the sample; structure and magnetization behavior of the sample the Mo1-xCoxO2 the preliminary study. Studies are as follows: 1. Experimentally investigated the structure and magnetic behavior of Co-doped ZnO samples in a series. The following conclusions: (1) analysis by X-ray spectra, in Zn1-xCoxO (x = 0.05,0.1,0.15) series of samples, in addition to the main phase of the samples sintered ZnO the outside there is a second phase CoO at 800 ℃ ; (2) MT curves can be seen that the sintered 6 hours and 12.5 hours sample Zn0.95Coo.05O of ??150K, 170K, respectively, the ferromagnetic transition. (3) doped for preparing the sintering time and the dopant concentration have a significant impact on the sample magnetization behaviors. The ferromagnetic there is only a short sintering time and a high dopant concentration in the sample; (4) in this article that ferromagnetism may originate in the long-range ferromagnetic exchange interaction between electrons on the shallow donor electronic modulation CO2-CO2 t2 track. Experimentally investigated the structure and magnetic behavior of Mo-doped ZnO samples in a series. The following conclusions: (1) analysis by X-ray spectra, Zn 1-xMoxO samples sintered at 800 ℃, in addition to the main phase of ZnO Zn3Mo2O9 second phase; (2) MT curve, you can see the sample probably 150K paramagnetic to ferromagnetic transition; (3) doped with the sintering time for preparing a sample and a dopant concentration has a significant effect on the sample magnetization behaviors, ferromagnetic exists only long sintering time and a dopant concentration of 0.1 samples; (4) MO4 doping is equivalent to the n-type doping, the paper argues that the ferromagnetism of Zn 1-xMoxO from Mo4 4d electron conduction electron-mediated formation of long-range ferromagnetic coupling. Experimentally investigated the structure and magnetic behavior of Co and Mo-doped ZnO samples in a series. The following conclusions: (1) by X-ray analysis of the samples sintered at 800 ℃ Zn0.95-xMo0.1CoxO (x = 0.05,0.1,0.15), in addition to the main phase of ZnO, there CO2MO3O8 second phase; (2) The magnetic measurements show that, of Co and Mo doped ZnO to reduce the magnetic transition temperature; (3) in this article that Co, Mo Codoped the ferromagnetism derived from the media, the transition metal localized conduction electron- coupling between electrons .4 experimentally studied the structure and magnetic behavior of Co-doped MoO2 series of samples. The following conclusions: (1) by X-ray analysis at 700 ℃ burn 6 hours Mo0.83Co0.17O samples, in addition to the main phase MoO2 there Mo6Co6C2 second phase, this sample at 600 ° C burn 19 hours, In addition to the main phase MoO2 there Co2Mo3O8 second phase; 600 ° C burn the 6 hours Mo0.77Co0.23O samples, in addition to the main phase MoO2 Mo6Co6C second phase, citric acid is the Mo 0.25 times the MO0 a .77 Co0.23O sample, was burned in 600 ° C for 19 hours, In addition to the main phase MoO2, there Co2Mo3O8 second phase; (2) The magnetic measurements show that the doped sample preparation temperature and doping concentration of the sample magnetization behaviors significant impact; (3) This paper argues that the, MO1-xCoxO2 sample ferromagnetic interaction between the media CO2 derived from the carrier.

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