Mossbauer effect in iron-carbon and iron-nitrogen alloys

Gielen, P. M.; Kaplow, Roy

doi:10.1016/0001-6160(67)90155-1

Cited by 96 publications

(25 citation statements)

References 25 publications

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“…Other peaks are evident, corresponding to about 15% of the total sample, with an isomer shift 8 = 0.19 mm/s and Hint = 20.8 T, which are characteristic of cementite, Fe3C [17,18].…”

Section: Resultsmentioning

confidence: 99%

The surface chemistry of chloroform as an extreme-pressure lubricant additive at high concentrations

et al. 1995

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Carbon tetrachloride is an extremely good extreme-pressure (EP) lubricant additive at low concentrations (< 3 wt% chlorine) since it can react to form a high-melting-point Fe3C antiseizure layer. In contrast, small hydrogen-containing additive molecules (CH2C12, CHC13) decompose to form FeC12 which melts at ,,~940 K and limits the maximum seizure load to N 3500 N as measured in a pin and v-block apparatus. However, both thermodynamic calculations and results of a Mfssbauer analysis of an iron foil heated in CHCI3 at 830 K indicate that iron carbide can be formed from chloroform. In addition, it is also found in that case that a plot of seizure load versus concentration, after initially forming a plateau, once again increases with higher additive concentrations (> 4 wt% chlorine) in accord with the idea that a higher melting point carbide film can be formed. It has been shown previously that asymptotes in the plot of removal rate versus applied load correspond to melting of the interracial anti-seizure film. When using 9.0 wt% chlorine from chloroform as the additive, a drastic increase in removal rate is found at an interfacial temperature of-~ 940 K corresponding to the melting of FeC12 and an additional asymptote is evident at ,-~ 1500 K due to the melting of Fe3C in accord with the thermodynamic and M6ssbauer results.

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“…Other peaks are evident, corresponding to about 15% of the total sample, with an isomer shift 8 = 0.19 mm/s and Hint = 20.8 T, which are characteristic of cementite, Fe3C [17,18].…”

Section: Resultsmentioning

confidence: 99%

The surface chemistry of chloroform as an extreme-pressure lubricant additive at high concentrations

et al. 1995

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“…In the framework of the RSM, Giellen and Kaplow [11] and afterwards DeCristofaro and Kaplow [12] used only two hyperfine interactions, one (E 1) associated to Fe atoms with a nearest neighbor N atom, and the other ascribed to the rest of the Fe atoms (Eo). By analyzing the relative fractions (see Table I), it was concluded that the N atoms are randomly distributed in the octahedral interstitial sites.…”

Section: The Mossbauer Pattern and The Modelsmentioning

confidence: 99%

Distribution of N Atoms in the fcc Fe-N Interstitial Solid Solution

et al. 2004

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Abstract. Monte Carlo simulations, analytical calculations and thermodynamic activity data have been combined in a study of the distribution of interstitial nitrogen atoms in the octahedral sites of the Pe-N solid solution. Two models are compared in the analysis of the Mossbauer spectra. Thermodynamic activity data are analyzed in terms of the quasichemical approximation to the statistical mechanics of interstitial solutions. The formation energies of the N-N pairs thus assessed are used as input in both Monte Carlo simulations and the quasichemical calculations. A significant discrepancy between Monte Carlo predictions and the Mossbauer results is detected. This striking effect becomes particularly important when the ordered structure model is applied in the analysis of Mossbauer data.

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“…These considerations have been used to analyze the results of two traditional experimental approaches, i.e. a nanoscopic approach, which focuses on the local distribution of solute atoms around Fe atoms, making use of information provided by Mo¨ssbauer experiments [10][11][12][14][15][16][17][20][21][22][23][24][25][26][27] and a macroscopic approach based on the thermodynamic activity [4,7,28]. By Mo¨ssbauer spectroscopy the local neighborhood of the Fe atoms in solid solutions can be studied, and the contributions of various environments to the experimental spectra can be determined [29].…”

Section: Introductionmentioning

confidence: 99%

“…By Mo¨ssbauer spectroscopy the local neighborhood of the Fe atoms in solid solutions can be studied, and the contributions of various environments to the experimental spectra can be determined [29]. Much effort has been devoted to analyze the Mo¨ssbauer spectra (MS) of Fe-N alloys, in terms of various models of the distribution of N atoms in the interstitial sublattice [12,[14][15][16][17][20][21][22][23][24][25][26][27]. Alternatively, the thermodynamic activity of N in austenite ða N Þ [28], accounting for average and macroscopic properties, has been analyzed using statistical models of the interstitial solutions, in particular, with the quasi-chemical approximation (QCA) [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…A key feature of the present approach is to rely on the interplay between various types of experimental and theoretical information. More specifically, the work includes a systematization and analysis of Mo¨ss-bauer data [12,[14][15][16][17][21][22][23][24][25][26][27], MC simulations, calculations based on the QCA [18,19], and the consideration of thermodynamic activity versus composition data [28].…”

Section: Introductionmentioning

confidence: 99%

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