ELECTRICAL, OPTICAL AND PHOTOCONDUCTING PROPERTIES OF FE2-XCRXO3 (0LESS THAN OR EQUAL TOXLESS THAN OR EQUAL TO0.47)

被引:111
作者
MERCHANT, P [1 ]
COLLINS, R [1 ]
KERSHAW, R [1 ]
DWIGHT, K [1 ]
WOLD, A [1 ]
机构
[1] BROWN UNIV,DEPT CHEM,PROVIDENCE,RI 02912
关键词
D O I
10.1016/0022-4596(79)90173-7
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A study has been made of the electrical, optical and photoconducting properties of pure and reduced single crystals of composition Fe2-xCrxO3 where 0 ≤ x ≤ 0.47. It has been found that pure α-Fe2O3 is not a photoconductor. When defect-free crystals of α-Fe2O3 are reduced a surface layer of Fe3O4 is formed and the crystals exhibit photoconductivity. Removal of this layer resulted in the disappearance of photocurrents and an increase in the sample resistivity. A necessary condition for the observation of photocurrents in n-type Fe2O3 is that some Fe3O4 be present. In addition, it has been found that the substitution of chromium for iron in α-Fe2O3 results in a monotonically decreasing optical band gap as the chromium concentration, x, increases. © 1979.
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页码:307 / 315
页数:9
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