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Title: Deuterium absorption and material phase characteristics of Zr[sub 2]Fe

Scanning electron microscope (SEM) images of polished surfaces, electron probe microanalysis, and X-ray powder diffractometry indicated the presence of a continuous Zr[sub 2]Fe phase with secondary phases of ZrFe[sub 2], Zr[sub 5]FeSn, [alpha]-Zr, and Zr[sub 6]Fe[sub 3]O. A statistically-designed experiment to determine the effects of temperature, time, and vacuum quality On activation of St 198 revealed that when activated at low temperature (350[degrees]C) deuterium absorption rate was slower when the vacuum quality was pwr (2.5 Pa vs. 3[times]10[sup [minus]4] Pa). However, at higher activation temperature (500[degrees]C), deuterium absorption rate was fast and was independent of vacuum quality. Deuterium pressure-composition-temperature (P-C-T) data are reported for St 198 in the temperature range 200--500[degrees]C. The P-C-T data over the full range of deuterium loading and at temperatures of 350[degrees]C and below is described by: K[sub 0e]-([Delta]H[sub [alpha]]/RT)=PD[sub 2]q[sup 2]/(q*[minus]q)[sup 2] where [Delta]H[alpha] and K[sub 0] have values of 101.8 kJ[center dot]mole[sup [minus]1] and 3.24[times]10[sup [minus]8]Pa[sup [minus]1], and q* is 15.998 kPa[center dot]L[sup [minus]1][center dot]g[sup [minus]1]. At higher temperatures, one or more secondary reactions in the solid phase occur that slowly consume D[sub 2] from the gas phase. XRD suggests these reactions to be: 2 Zr[sub 2]FeD[sub x] [yields] x ZrD[sub 2] + x/3more » ZrFe[sub 2] + (2 [minus] 2/3x) Zr[sub 2]Fe and Zr[sub 2]FeD[sub x] + (2 [minus]1/2x) D[sub 2] [yields] ZrD[sub 2] + Fe, where 0 < x < 3. Reaction between gas phase deuterium and Zr2FC formed in the first reaction accounts for the observed consumption of deuterium from the gas phase by this reaction.« less
Authors:
; ; ;
Publication Date:
OSTI Identifier:
6564362
Report Number(s):
WSRC-TR-92-557
ON: DE93011777
DOE Contract Number:
AC09-89SR18035
Resource Type:
Technical Report
Research Org:
Westinghouse Savannah River Co., Aiken, SC (United States)
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; 36 MATERIALS SCIENCE; DEUTERIUM; ADSORPTION; IRON ALLOYS; SORPTIVE PROPERTIES; ZIRCONIUM BASE ALLOYS; DEUTERATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; ALLOYS; CHEMICAL REACTIONS; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; NUCLEI; ODD-ODD NUCLEI; SORPTION; STABLE ISOTOPES; SURFACE PROPERTIES; TEMPERATURE RANGE; ZIRCONIUM ALLOYS 400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials; 360104 -- Metals & Alloys-- Physical Properties