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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2002.6
- 수록면
- 25 - 28 (4page)
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초록· 키워드
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Slowly cooled Cu_xFe_(3-x)O₄ (x = 0.1, 0.2) have been investigated over a temperature range from 82 to 700 K using the Mossbauer technique. X-ray diffraction shows that these have a single-phase cubic spinel structure of lattice parameters α = 8.396 and 8.398 Å, respectively. Since Cu ions prefer B (octahedral) sites to A (tetrahedral) sites, the ionic distribution is (Fe)_A[Fe_(2-x)Cu_x]_BO₄. Mossbauer spectra consisted of two sets of 6-line pattern from A site in ferric state and B site in ferrous-ferric state. Intensity ratio of B to A subspectra is 1.0 at 82 K and increases to 2.0 at 700 K with increasing temperature. After annealing the samples under vacuum at 450℃ for a half hour, x-ray diffraction patterns have the peaks of magnetite- and hematite-phase. Lattice constants of magnetite-phase are 8.395 and 8.392 Å smaller than 8.396 and 8.398 Å before annealing, respectively. Mossbauer spectra reveal the conventional magnetite pattern with the additional hematite pattern. Intensity ratios of B to A subspectra for magnetite-phase become 1.9-2.0 over all temperature ranges and Cu ions are distributed over A and B sites randomly. Ratios of hematite to total intensity in Mossbauer spectra for x = 0.1 and x = 0.2 are 10 and 21%, respectively. These hematite ratios may be due to annealing under vacuum at 450℃, which transforms Cu²+ ionic states into Cu¹+. Verwey temperatures for x = 0.1 and x = 0.2 are 123±2 K and 128±2 K.
목차
Abstract
1. Introduction
2. Experimental
3. Results and Discussion
Acknowledgement
References
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