The kinetics of sintering of Ni(s)-NiO(s) and Fe(s)-Fe1-xO(s) powder mixts. were investigated by measurements of d.c. quantities such as resistance, emf., and current under a const. applied voltage. Sintering of compacted pellets of the 2 powder mixts. was carried out at 1293 K in Ar at 101.325 kPa with an O partial pressure of <1 × 10-10 Pa for ∼60 h. Different behavior of the recorded quantities was found between the 2 mixts. The elec. resistance of the Fe(s)-Fe1-xO(s) mixt. decreased with increasing time to reach a const. value. On the contrary, the other mixt. had a high resistance for a relevant part of the expt. and then through a transition period became low and const. An anal. of the results in terms of resistivity and Tamman's sintering temp. of the components seems satisfactory for explaining the exptl. results.
ELECTRICAL PARAMETERS IN ME-MEO SINTERING / Gozzi, Daniele. - In: MATERIALS CHEMISTRY AND PHYSICS. - ISSN 0254-0584. - STAMPA. - 21:4(1989), pp. 377-389. [10.1016/0254-0584(89)90139-9]
ELECTRICAL PARAMETERS IN ME-MEO SINTERING
GOZZI, Daniele
1989
Abstract
The kinetics of sintering of Ni(s)-NiO(s) and Fe(s)-Fe1-xO(s) powder mixts. were investigated by measurements of d.c. quantities such as resistance, emf., and current under a const. applied voltage. Sintering of compacted pellets of the 2 powder mixts. was carried out at 1293 K in Ar at 101.325 kPa with an O partial pressure of <1 × 10-10 Pa for ∼60 h. Different behavior of the recorded quantities was found between the 2 mixts. The elec. resistance of the Fe(s)-Fe1-xO(s) mixt. decreased with increasing time to reach a const. value. On the contrary, the other mixt. had a high resistance for a relevant part of the expt. and then through a transition period became low and const. An anal. of the results in terms of resistivity and Tamman's sintering temp. of the components seems satisfactory for explaining the exptl. results.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
