QUANTUM SIZE EFFECTS IN LIGHT-ABSORPTION SPECTRA OF MAGNETITE FINE PARTICLES DISPERSED IN MAGNETIC FLUIDS

被引：23

作者：

TAKETOMI, S ^{[1
]}

TAKAHASHI, H ^{[1
]}

INABA, N ^{[1
]}

MIYAJIMA, H ^{[1
]}

机构：

[1] KEIO UNIV,FAC SCI & TECHNOL,DEPT PHYS,YOKOHAMA,KANAGAWA 223,JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1991年 / 60卷 / 10期

关键词：

QUANTUM SIZE EFFECT; BLUE SHIFT; LIGHT ABSORPTION SPECTRA; MAGNETITE FINE PARTICLE; MAGNETIC FLUID; 4S-ELECTRON;

D O I：

10.1143/JPSJ.60.3426

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Light absorption spectra of magnetite fine particles of about 7 nm in mean diameter dispersed in magnetic fluid were measured as functions of photon energy, E, from 0.5 eV through 1.8 eV and of particles' temperature from 294 K up to 383 K. The light absorption coefficient alpha of the particles is smaller than that of the bulk magnetite. With increasing temperature, alpha decreases for E lower than 1.378 eV, but it increases for E higher than 1.378 eV. In addition, the spectra are shifted towards higher energy region by 0.136 eV compared with that of the bulk magnetite. If concentration of oscillator strengths on the bottom of 4s band of iron is assumed, the energy shift can be interpreted in terms of the quantum size effect of the fine particles, and the effective mass of the 4s electron is evaluated to be 0.37 times as much as that of a bare electron.

引用

页码：3426 / 3432

页数：7

共 33 条

[11] PRESSURE EFFECT ON THE ANOMALOUS ELECTRICAL-CONDUCTIVITY OF MAGNETITE [J].

KAKUDATE, Y ;

MORI, N ;

KINO, Y .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1979, 12 (01) :22-25

[12] QUANTUM-SIZE EFFECTS OF INTERACTING ELECTRONS AND HOLES IN SEMICONDUCTOR MICROCRYSTALS WITH SPHERICAL SHAPE [J].

KAYANUMA, Y .

PHYSICAL REVIEW B, 1988, 38 (14) :9797-9805

[13] WANNIER EXCITON IN MICROCRYSTALS [J].

KAYANUMA, Y .

SOLID STATE COMMUNICATIONS, 1986, 59 (06) :405-408

[14] OPTICAL PROPERTIES OF CU-COMPLEX CENTERS IN KCL SINGLE-CRYSTALS [J].

KISHISHITA, H .

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 1973, 55 (01) :399-406

[15]

MIYAZAKI M, 1976, Patent No. 5113995

[16] OPTICAL-ABSORPTION IN POLYCRYSTALLINE THIN-FILMS OF MAGNETITE AT ROOM-TEMPERATURE [J].

MURET, P .

SOLID STATE COMMUNICATIONS, 1974, 14 (11) :1119-1122

[17]

Rosensweig R.E., 2013, FERROHYDRODYNAMICS

[18]

SATOKO C, 1984, KOTAI BUTSURI, V19, P705

[19] OPTICAL-PROPERTIES OF MAGNETITE (FE3O4) [J].

SCHLEGEL, A ;

ALVARADO, SF ;

WACHTER, P .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1979, 12 (06) :1157-1164

[20] ELECTRON-DIFFRACTION STUDY OF LIQUID-SOLID TRANSITION OF THIN METAL FILMS [J].

TAKAGI, M .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1954, 9 (03) :359-363

← 1 2 3 4 →