EFFECTS OF SURFACE-ADSORPTION ON THE PROPERTIES OF ALPHA-FE2O3 FINE PARTICLES

被引：4

作者：

WANG, GH ^{[1
]}

ZHONG, XP ^{[1
]}

WANG, Q ^{[1
]}

LUO, HL ^{[1
]}

机构：

[1] HEBEI NORMAL UNIV,DEPT PHYS,SHIJIAZHUANG 050016,PEOPLES R CHINA

来源：

JOURNAL OF APPLIED PHYSICS | 1991年 / 70卷 / 10期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.350102

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The properties of fine particles of alpha-Fe2O3 (sample A), and alpha-Fe2O3 coated with cobalt (sample B) and adsorbed with pyridine (sample C) have been investigated by means of magnetic measurements, Mossbauer spectra and x-ray photoelectron spectroscopy (XPS). The size of these fine particles is about 500 angstrom. The Morin transition temperatures T(m) for samples A, B, and C are 191, < 80, and 224 K, respectively. The Mossbauer spectra of the samples were measured in a temperature range from 80 to 300 K and the angles between <111> axis and the spin of irons for these samples have been calculated from these spectra. The XPS results show that the Fe 2p and 3d peaks of sample C shift to lower energy regions compared with those of sample A. It seems to be that some electrons may move from pyridine molecules to the iron atoms in sample C. The reasons for the T(m) change of samples B and C were discussed on the basis of the experimental results.

引用

页码：5906 / 5908

页数：3

共 7 条

[1] MAGNETOCRYSTALLINE ANISOTROPY OF PURE AND DOPED HEMATITE [J].

BESSER, PJ ;

MORRISH, AH ;

SEARLE, CW .

PHYSICAL REVIEW, 1967, 153 (02) :632-&

[2]

CHEVALLIER R, 1943, ANN PHYS PARIES, V8, P258

[3] NUMERICAL ESTIMATION OF MOSSBAUER SPECTRA PARAMETERS [J].

DUKE, BJ ;

GIBB, TC .

JOURNAL OF THE CHEMICAL SOCIETY A -INORGANIC PHYSICAL THEORETICAL, 1967, (09) :1478-&

[4]

Luo He-lie, 1986, Acta Physica Sinica, V35, P489

[5] MAGNETIC SUSCEPTIBILITY OF ALPHA-FE203 AND ALPHA-FE203 WITH ADDED TITANIUM [J].

MORIN, FJ .

PHYSICAL REVIEW, 1950, 78 (06) :819-820

[6]

TASAKI A, 1961, J PHYS SOC JPN, V2, P167

[7] PRESSURE DEPENDENCE OF MORIN TRANSITION IN ALPHA-FE2O3 TO 26 KBAR [J].

WORLTON, TG ;

BENNION, RB ;

BRUGGER, RM .

PHYSICS LETTERS A, 1967, A 24 (12) :653-&

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