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Title: Synthesis of Ternary Nitrides From Intermetallic Precursors: Modes of Nitridation in Model Cr 3Pt Alloys to Form Cr 3PtN Perovskite and Applications to Other Systems

Abstract

The use of intermetallic alloy precursors is explored as a new means to synthesize complex transition and refractory metal nitrides, carbides, and related phases. The conditions under which model single-phase Cr{sub 3}Pt and two-phase Cr{sub 3}Pt-dispersed Cr alloys form Cr{sub 3}PtN antiperovskite when thermally nitrided were studied. Phenomenological experiments suggest that the key variable to achieving single-phase Cr{sub 3}PtN surface layers is the Cr{sub 3}Pt phase composition. In two-phase {beta}-Cr-Cr{sub 3}Pt alloys, the formation of single-phase Cr{sub 3}PtN at Cr{sub 3}Pt precipitates by in-place internal nitridation was found to be a strong function of the size of the Cr{sub 3}Pt dispersion in the microstructure. Nanoscale Cr{sub 3}Pt dispersions were readily converted to near single-phase Cr{sub 3}PtN, whereas nitridation of coarse Cr{sub 3}Pt particles resulted in a cellular or discontinuous-type reaction to form a lath mixture of Cr{sub 3}PtN and a more Cr-rich Cr{sub 3}Pt or {beta}-Cr. The potential for using such external/internal oxidation phenomena as a synthesis approach to layered or composite surfaces of ternary ceramic phases (nitrides, carbides, borides, etc.) of technological interest such as the Ti{sub 3}AlC{sub 2} phase, bimetallic nitride, and carbide catalysts (Co{sub 3}Mo{sub 3}N and Co{sub 3}Mo{sub 3}C and related phases), and magnetic rare earthmore » nitrides (Fe{sub 17}Sm{sub 2}N{sub x} or Fe{sub 17}Nd{sub 2}N{sub x}) is discussed.« less

Authors:
 [1];  [2];  [3];  [1];  [1];  [1];  [1]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
  3. Ames Laboratory
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory; Shared Research Equipment Collaborative Research Center
Sponsoring Org.:
FE USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
1003132
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chemistry of Materials; Journal Volume: 16; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALLOYS; BORIDES; CARBIDES; CATALYSTS; CERAMICS; DISPERSIONS; FUNCTIONS; LAYERS; MICROSTRUCTURE; MIXTURES; NITRIDATION; NITRIDES; OXIDATION; PEROVSKITE; POTENTIALS; RARE EARTHS; REFRACTORY METALS; SURFACES; SYNTHESIS

Citation Formats

Brady, Michael P, Wrobel, Sarah, Lograsso, Tom, Payzant, E Andrew, Hoelzer, David T, Horton Jr, Joe A, and Walker, Larry R. Synthesis of Ternary Nitrides From Intermetallic Precursors: Modes of Nitridation in Model Cr3Pt Alloys to Form Cr3PtN Perovskite and Applications to Other Systems. United States: N. p., 2004. Web. doi:10.1021/cm034942p.
Brady, Michael P, Wrobel, Sarah, Lograsso, Tom, Payzant, E Andrew, Hoelzer, David T, Horton Jr, Joe A, & Walker, Larry R. Synthesis of Ternary Nitrides From Intermetallic Precursors: Modes of Nitridation in Model Cr3Pt Alloys to Form Cr3PtN Perovskite and Applications to Other Systems. United States. doi:10.1021/cm034942p.
Brady, Michael P, Wrobel, Sarah, Lograsso, Tom, Payzant, E Andrew, Hoelzer, David T, Horton Jr, Joe A, and Walker, Larry R. Thu . "Synthesis of Ternary Nitrides From Intermetallic Precursors: Modes of Nitridation in Model Cr3Pt Alloys to Form Cr3PtN Perovskite and Applications to Other Systems". United States. doi:10.1021/cm034942p.
@article{osti_1003132,
title = {Synthesis of Ternary Nitrides From Intermetallic Precursors: Modes of Nitridation in Model Cr3Pt Alloys to Form Cr3PtN Perovskite and Applications to Other Systems},
author = {Brady, Michael P and Wrobel, Sarah and Lograsso, Tom and Payzant, E Andrew and Hoelzer, David T and Horton Jr, Joe A and Walker, Larry R},
abstractNote = {The use of intermetallic alloy precursors is explored as a new means to synthesize complex transition and refractory metal nitrides, carbides, and related phases. The conditions under which model single-phase Cr{sub 3}Pt and two-phase Cr{sub 3}Pt-dispersed Cr alloys form Cr{sub 3}PtN antiperovskite when thermally nitrided were studied. Phenomenological experiments suggest that the key variable to achieving single-phase Cr{sub 3}PtN surface layers is the Cr{sub 3}Pt phase composition. In two-phase {beta}-Cr-Cr{sub 3}Pt alloys, the formation of single-phase Cr{sub 3}PtN at Cr{sub 3}Pt precipitates by in-place internal nitridation was found to be a strong function of the size of the Cr{sub 3}Pt dispersion in the microstructure. Nanoscale Cr{sub 3}Pt dispersions were readily converted to near single-phase Cr{sub 3}PtN, whereas nitridation of coarse Cr{sub 3}Pt particles resulted in a cellular or discontinuous-type reaction to form a lath mixture of Cr{sub 3}PtN and a more Cr-rich Cr{sub 3}Pt or {beta}-Cr. The potential for using such external/internal oxidation phenomena as a synthesis approach to layered or composite surfaces of ternary ceramic phases (nitrides, carbides, borides, etc.) of technological interest such as the Ti{sub 3}AlC{sub 2} phase, bimetallic nitride, and carbide catalysts (Co{sub 3}Mo{sub 3}N and Co{sub 3}Mo{sub 3}C and related phases), and magnetic rare earth nitrides (Fe{sub 17}Sm{sub 2}N{sub x} or Fe{sub 17}Nd{sub 2}N{sub x}) is discussed.},
doi = {10.1021/cm034942p},
journal = {Chemistry of Materials},
number = 10,
volume = 16,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2004},
month = {Thu Jan 01 00:00:00 EST 2004}
}