Structural and Magnetic Properties of Cu-Substituted Magnetite Studied by Using M¨ossbauer Spectroscopy
Structural and Magnetic Properties of Cu-Substituted Magnetite Studied by Using M¨ossbauer Spectroscopy
이충섭(부경대학교); Yang Hee Joe(Pukyong National University); 김철성(국민대학교)
56권 1호, 85~88쪽
초록
Slowly cooled CuxFe3−xO4 (x = 0.2, 0.3) has been investigated over a temperature range from RT to 700 K by using the M¨ossbauer technique. After the samples are annealed under vacuum at 450 ℃ for half an hour, M¨ossbauer spectra reveal the conventional magnetite pattern with an additional hematite pattern. The ratios of the hematite intensity to the total intensity in the M¨ossbauer spectra for x = 0.2 and x = 0.3 are 21 and 31 %, respectively. These hematite ratios may be due to annealing under vacuum at 450 ℃, which transforms Cu2+ ionic states into Cu1+. If the charge neutral condition is applied to the magnetite phase of the annealed sample, the Cu1+-substituted magnetite with a single-phase cubic spinel structure is produced.
Abstract
Slowly cooled CuxFe3−xO4 (x = 0.2, 0.3) has been investigated over a temperature range from RT to 700 K by using the M¨ossbauer technique. After the samples are annealed under vacuum at 450 ℃ for half an hour, M¨ossbauer spectra reveal the conventional magnetite pattern with an additional hematite pattern. The ratios of the hematite intensity to the total intensity in the M¨ossbauer spectra for x = 0.2 and x = 0.3 are 21 and 31 %, respectively. These hematite ratios may be due to annealing under vacuum at 450 ℃, which transforms Cu2+ ionic states into Cu1+. If the charge neutral condition is applied to the magnetite phase of the annealed sample, the Cu1+-substituted magnetite with a single-phase cubic spinel structure is produced.
- 발행기관:
- 한국물리학회
- 분류:
- 물리학