X-Ray and Electron Diffraction Study on Mean Square Displacement of Atoms in the Fine Particles of Silver and Chromium

Kashiwase, Yasuji; Nishida, Isao; Kainuma, Yoshiro; Kimoto, Kazuo

doi:10.1143/jpsj.38.899

Cited by 21 publications

(6 citation statements)

References 5 publications

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“…The intensity ratio I 110 / I 220 was measured from the intensity profile of these NBD patterns. Actually, for example, the large increase of the Debye-Waller factors close to 0.01 nm 2 were reported for 2 -3-nm-sized Cr, 19 Pd, 20 and Cu ͑Refs. On the contrary, specimen tilt towards the ͓110͔ direction does not affect the intensity ratio since the calculated intensity ratios under ͓114͔, ͓116͔, and ͓118͔ beam incidences with different tilt angles exhibited an almost the same thickness dependence in the thickness range below 15 nm according to the intensity calculation.…”

Section: Determination Of the Lro Parameter Of Individual Fepd Nanmentioning

confidence: 91%

Long-range order parameter of single L10-FePd nanoparticle determined by nanobeam electron diffraction: Particle size dependence of the order parameter

Sato

Hirotsu

Mori

et al. 2005

Journal of Applied Physics

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Fabrication of oriented L 1 0 -FeCuPd and composite bcc -Fe ∕ L 1 0 -FeCuPd nanoparticles: Alloy composition dependence of magnetic properties J. Appl. Phys. 99, 08N706 (2006); 10.1063/1.2165604 Determination of order parameter of L 1 0 -Fe Pd nanoparticles by electron diffraction J. Appl. Phys. 97, 084301 (2005); 10.1063/1.1861987 Fabrication of exchange-coupled α -Fe ∕ L 1 0 -FePd nanocomposite isolated particlesThe long-range order ͑LRO͒ parameter ͑S͒ of single isolated L1 0 -FePd nanoparticle was determined by quantitative analysis of nanobeam electron diffraction ͑NBD͒ intensities and intensity calculations considering the multiple scattering of electrons. The obtained order parameters of the nanoparticles larger than 8 nm are distributed around the mean LRO parameter ͑S = 0.79͒ which was determined by selected area electron diffraction intensity analysis, while the parameters slightly decreased gradually as the particle size decreased below about 8 nm ͑S = 0.60-0.73͒. The low degree of order in very small particles is responsible for the coercivity decrease of the L1 0 nanoparticles in smaller-sized regions. Quantitative NBD intensity analysis is quite useful for the determination of the LRO parameter of individual L1 0 -FePd single crystalline nanoparticle. Experimental conditions required for NBD analysis are presented in detail and the possible experimental errors of the determined LRO parameters are discussed.

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Section: Determination Of the Lro Parameter Of Individual Fepd Nanmentioning

confidence: 91%

Long-range order parameter of single L10-FePd nanoparticle determined by nanobeam electron diffraction: Particle size dependence of the order parameter

Sato

Hirotsu

Mori

et al. 2005

Journal of Applied Physics

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“…X-ray studies on thermal motion of atoms in the fine particles whose size was less than several hundred angstroms were first carried out by using the silver [6] and gold [7] particles prepared by gas evaporation technique [8, 91. By using electron ing angles in the Debye-Scherrer rings of electron diffraction patterns.…”

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confidence: 99%

X-Ray Diffraction Study on Lattice Vibration of Fine Particles

et al. 1977

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R6sum6. -On a detecmine la temperature de Debye eM = 156 K, pour de petites particules d'argent d'environ 150 A de diamktre ? I partir &experiences de diffraction X relatives 2 la variation de l'intensite integree des anneaux de Debye-Scherrer en fonction de la temperature. Le fait que'cette temp6rature de Debye soit bien inf6rieure P celle d'un cristal massif d'argent eM = 212 K permet de conclure B l'adoucissement des vibrations cristallines dans les petites particules d'argent.Abstract. -The Debye temper~ture OM = 156 K has been obtained for the fine particles of silver, whose size was about 150 A in diameter, from the X-ray diffraction experiment on the temperature dependence of the integrated intensity in the Debye-Schemer rings. The fact that the Debye temperature obtained in the present experiment is much lower than that of the bulk silver crystal, i.e. OM = 212 K, concludes the softening of lattice vibration occurring in the fine particles of silver.

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“…There are several reports showing the increase of B with decreasing the particle size. [25][26][27][28][29][30][31] Harada and Ohshima 25) reported the temperature factor for Au particles, where the B value is about 0.01 nm 2 at 300 K for 15 nm-sized Au particles (B ¼ 0:0062 or 0.0040 nm 2 , 23) or 0.0057 nm 2 24) at 293 K for bulk Au). They also showed that their obtained B for Au particles with sizes 6 to 23 nm included scarcely the static components.…”

Section: Discussionmentioning

confidence: 99%

Long-Range Order Parameter of Oriented L1<SUB>0</SUB>-FePt Nanoparticles Determined by Electron Diffraction

Sato

Hirotsu

2003

Mater. Trans.

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Two-dimensionally dispersed L1 0 -FePt nanoparticles as small as 12 nm with orientation was fabricated by electron-beam evaporation and post-annealing at 873 K. After a prolonged annealing at 873 K for 86.4 ks, the increase of coercivity was almost saturated and coercivity reached 434 kAm À1 at 300 K, which is very small compared to recent reports on FePt nanoparticles with sizes larger than 20 nm. Long-range order parameter of the fabricated nanoparticles was determined by electron diffraction at 200 kV taking the multiple scattering into consideration. Obtained order parameter remained 0:55 AE 0:02 for the nanoparticles with an axial ratio c=a of 0:961 AE 0:003. The low degree of order is thought to be responsible for the small coercivity. Effect of Debye-Waller factor on the order parameter was discussed.

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X-Ray and Electron Diffraction Study on Mean Square Displacement of Atoms in the Fine Particles of Silver and Chromium

Cited by 21 publications

References 5 publications

Long-range order parameter of single L10-FePd nanoparticle determined by nanobeam electron diffraction: Particle size dependence of the order parameter

Long-range order parameter of single L10-FePd nanoparticle determined by nanobeam electron diffraction: Particle size dependence of the order parameter

X-Ray Diffraction Study on Lattice Vibration of Fine Particles

Long-Range Order Parameter of Oriented L1<SUB>0</SUB>-FePt Nanoparticles Determined by Electron Diffraction

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