EXAFS and Raman studies of mechanical alloyed Ni25Se75 mixture under high-pressure conditions

被引：11
作者：
Campos, CEM
de Lima, JC
Grandi, TA
Machado, KD
Itié, JP
Polian, A
机构：
[1] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil
[2] Univ Paris 06, Phys Milieux Condenses Lab, F-75015 Paris, France
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2005年 / 178卷 / 01期
关键词：
X-ray absorption spectroscopy (EXAFS); high-pressure effects in solids; mechanical alloying; nanocrystalline materials;
D O I：
10.1016/j.jssc.2004.10.006
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Extended X-ray Absorption Fine Structure and Raman studies were performed to follow the structural and vibrational behavior of a mechanical alloyed Ni25Se75 mixture, containing nanocrystalline pyrite NiSe2 phase, when exposed to high-pressure conditions. An increase in the local structural order of the nanocrystalline phase with pressure increasing was observed by means of Debye-Waller factor analysis. The relative Ni nearest-neighbors distances were determined as a function of pressure, which were used to determine the inverse linear compressibility of the nanocrystalline pyrite NiSe2 alloy as well as its derivate by means of Murnaghan's equation. The Raman results showed tentative NiSe2 phonons dispersion with pressure that becomes a difficult task since the existence/photo-induced nucleation of an important amount of nanocrystalline Se, detected due to the observation of its pressure-induced phase transitions. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码：93 / 99
页数：7
相关论文
共 22 条
[1]   Characterization of mechanosynthetized sulphides [J].
Balaz, P ;
Bastl, Z ;
Havlik, T ;
Lipka, J ;
Toth, I .
SYNTHESIS AND PROPERTIES OF MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS, PTS 1 AND 2 - ISMANAM-96, 1997, 235-2 :217-222
[2]   Pressure-induced phase transformations in amorphous selenium by x-ray diffraction and Raman spectroscopy [J].
Bandyopadhyay, AK ;
Ming, LC .
PHYSICAL REVIEW B, 1996, 54 (17) :12049-12056
[3]   Structural, thermal and optical studies of Ni3Se2 compound produced by mechanical alloying [J].
Campos, CEM ;
de Lima, JC ;
Grandi, TA ;
Machado, KD ;
Pizani, PS ;
Hinrichs, R .
SOLID STATE IONICS, 2004, 168 (1-2) :205-210
[4]   XRD, DSC, MS and RS studies of Fe75Se25 iron selenide prepared by mechano-synthesis [J].
Campos, CEM ;
de Lima, JC ;
Grandi, TA ;
Machado, KD ;
Drago, V ;
Pizani, PS .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2004, 270 (1-2) :89-98
[5]   Nucleation and growth of nanocrystalline pyrite nickel diselenide by mechanical alloying [J].
Campos, CEM ;
de Lima, JC ;
Grandi, TA ;
Machado, KD ;
Pizani, PS ;
Hinrichs, R .
SOLID STATE COMMUNICATIONS, 2003, 128 (6-7) :229-234
[6]   Structural studies of cobalt selenides prepared by mechanical alloying [J].
Campos, CEM ;
de Lima, JC ;
Grandi, TA ;
Machado, KD ;
Pizani, PS .
PHYSICA B-CONDENSED MATTER, 2002, 324 (1-4) :409-418
[7]   Hexagonal CoSe formation in mechanical alloyed Co75Se25 mixture [J].
Campos, CEM ;
de Lima, JC ;
Grandi, TA ;
Machado, KD ;
Drago, V ;
Pizani, PS .
SOLID STATE COMMUNICATIONS, 2004, 131 (3-4) :265-270
[8]   Structural studies of iron selenides prepared by mechanical alloying [J].
Campos, CEM ;
de Lima, JC ;
Grandi, TA ;
Machado, KD ;
Pizani, PS .
SOLID STATE COMMUNICATIONS, 2002, 123 (3-4) :179-184
[9]   Raman spectroscopy of NiSe2 and NiS2-xSex (0 < x < 2) thin films [J].
de las Heras, C ;
Agulló-Rueda, F .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2000, 12 (24) :5317-5324
[10]   Structural study of the Zn-Se system by ball milling technique [J].
de Lima, JC ;
dos Santos, VHF ;
Grandi, TA .
NANOSTRUCTURED MATERIALS, 1999, 11 (01) :51-57
123