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Title: Phase Transformations in Confined Nanosystems

Abstract

This project discovered that non-equilibrium structures, including chemically ordered structures not observed in bulk systems, form in isolated nanoscale systems. Further, a generalized model was developed that effectively explained the suppression of equilibrium phase transformations. This thermodynamic model considered the free energy decrease associated with the phase transformation was less than the increase in energy associated with the formation of an interphase interface, therefore inhibiting the phase transformation. A critical diameter exists where the system transitions to bulk behavior, and a generalized equation was formulated that successfully predicted this transition in the Fe-Au system. This provided and explains a new route to novel structures not possible in bulk systems. The structural characterization was accomplished using transmission electron microscopy in collaboration with Matthew Kramer of Ames Laboratory. The PI and graduate student visited Ames Laboratory several times a year to conduct the experiments.

Authors:
 [1];  [2]
  1. Department of Mechanical & Materials Engineering
  2. Department of Physics & Astronomy
Publication Date:
Research Org.:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Org.:
Ames Laboratory, Oak Ridge National Laboratory
OSTI Identifier:
1129757
Report Number(s):
Final Report
DE-FG02-09ER46621
DOE Contract Number:  
SC0001269
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Phase transformations, transmission electron microscopy

Citation Formats

Shield, Jeffrey E., and Belashchenko, Kirill. Phase Transformations in Confined Nanosystems. United States: N. p., 2014. Web. doi:10.2172/1129757.
Shield, Jeffrey E., & Belashchenko, Kirill. Phase Transformations in Confined Nanosystems. United States. https://doi.org/10.2172/1129757
Shield, Jeffrey E., and Belashchenko, Kirill. 2014. "Phase Transformations in Confined Nanosystems". United States. https://doi.org/10.2172/1129757. https://www.osti.gov/servlets/purl/1129757.
@article{osti_1129757,
title = {Phase Transformations in Confined Nanosystems},
author = {Shield, Jeffrey E. and Belashchenko, Kirill},
abstractNote = {This project discovered that non-equilibrium structures, including chemically ordered structures not observed in bulk systems, form in isolated nanoscale systems. Further, a generalized model was developed that effectively explained the suppression of equilibrium phase transformations. This thermodynamic model considered the free energy decrease associated with the phase transformation was less than the increase in energy associated with the formation of an interphase interface, therefore inhibiting the phase transformation. A critical diameter exists where the system transitions to bulk behavior, and a generalized equation was formulated that successfully predicted this transition in the Fe-Au system. This provided and explains a new route to novel structures not possible in bulk systems. The structural characterization was accomplished using transmission electron microscopy in collaboration with Matthew Kramer of Ames Laboratory. The PI and graduate student visited Ames Laboratory several times a year to conduct the experiments.},
doi = {10.2172/1129757},
url = {https://www.osti.gov/biblio/1129757}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 29 00:00:00 EDT 2014},
month = {Tue Apr 29 00:00:00 EDT 2014}
}