Amorphous electrodeposited Ni-22 at.% P alloys were analyzed in the amorphous and re-crystd. state by EDXD and XPS surface anal. The re-crystn. kinetics were detd. following in situ structural changes by EDXD. Distinct diffraction patterns indicating the presence of Ni3P confirm alloy re-crystn. at 645. The XPS results show that all the core level binding energies of nickel such as Ni2p3/2 and Ni2p1/2 and phosphorus (P2p, P2s) remained const. after the change from x-ray amorphous to cryst. structure of the Ni-P alloy. Differences obsd. were as follows: (a) the binding energy difference between the Ni2p main lines and the satellite, (b) the fine structure of the NiLMM Auger lines, and (c) the d. of states in the valence band in the region of the Ni3d electrons. On the basis of these results from EDXD and XPS, the change in alloy structure from x-ray amorphous to cryst. influences the electronic structure of the Ni-P alloy but not the chem. state of phosphorus. An explanation based on the screening model proposed in the literature is discussed.
From chemical to structural order of electrodeposited Ni22P alloy: An XPS and EDXD study / Elsener, B; Atzei, D; Krolikowski, A; Albertini, Vr; Sadun, Claudia; Caminiti, Ruggero; Rossi, A.. - In: CHEMISTRY OF MATERIALS. - ISSN 0897-4756. - STAMPA. - 16:(2004), pp. 4216-4225. [10.1021/cm030606x]
From chemical to structural order of electrodeposited Ni22P alloy: An XPS and EDXD study
SADUN, Claudia;CAMINITI, Ruggero;
2004
Abstract
Amorphous electrodeposited Ni-22 at.% P alloys were analyzed in the amorphous and re-crystd. state by EDXD and XPS surface anal. The re-crystn. kinetics were detd. following in situ structural changes by EDXD. Distinct diffraction patterns indicating the presence of Ni3P confirm alloy re-crystn. at 645. The XPS results show that all the core level binding energies of nickel such as Ni2p3/2 and Ni2p1/2 and phosphorus (P2p, P2s) remained const. after the change from x-ray amorphous to cryst. structure of the Ni-P alloy. Differences obsd. were as follows: (a) the binding energy difference between the Ni2p main lines and the satellite, (b) the fine structure of the NiLMM Auger lines, and (c) the d. of states in the valence band in the region of the Ni3d electrons. On the basis of these results from EDXD and XPS, the change in alloy structure from x-ray amorphous to cryst. influences the electronic structure of the Ni-P alloy but not the chem. state of phosphorus. An explanation based on the screening model proposed in the literature is discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
