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Title: Tunable ionic-conductivity of collapsed Sandia octahedral molecular sieves (SOMS).

Abstract

This proposal focuses on the synthesis and characterization of ''tunable'' perovskite ceramics with resulting controlled strength and temperature of dielectric constants and/or with ionic conductivity. Traditional methods of synthesis involve high temperature oxide mixing and baking. We developed a new methodology of synthesis involving the (1) low temperature hydrothermal synthesis of metastable porous phases with ''tuned'' stoichiometry, and element types, and then (2) low temperature heat treatment to build exact stoichiometry perovskites, with the desired vacancy concentrations. This flexible pathway can lead to compositions and structures not attainable by conventional methods. During the course of this program, a series of Na-Nb perovskites were synthesized by calcining and collapsing microporous Sandia Octahedral Molecular Sieve (SOMS) phases. These materials were studied by various characterization techniques and conductivity measurements to better delineate stability and stoichiometry/bulk conductivity relationships. The conductivity can be altered by changing the concentration and type of the substituting framework cation(s) or by ion exchange of sodium. To date, the Na{sub 0.9}Mg{sub 0.1}Nb{sub 0.8}Ti{sub 0.2}O{sub 3-{delta}} shows the best conductivity.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
899364
Report Number(s):
SAND2006-7116
TRN: US200709%%82
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MOLECULAR SIEVES; PEROVSKITES; DIELECTRIC PROPERTIES; IONIC CONDUCTIVITY; SYNTHESIS; SODIUM OXIDES; NIOBIUM OXIDES; MAGNESIUM OXIDES; TITANIUM OXIDES; Dielectric materials; Thermal conductivity.; Ceramic materials.; Materials.

Citation Formats

Pless, Jason, Nenoff, Tina Maria, Garino, Terry J, and Axness, Marlene. Tunable ionic-conductivity of collapsed Sandia octahedral molecular sieves (SOMS).. United States: N. p., 2006. Web. doi:10.2172/899364.
Pless, Jason, Nenoff, Tina Maria, Garino, Terry J, & Axness, Marlene. Tunable ionic-conductivity of collapsed Sandia octahedral molecular sieves (SOMS).. United States. https://doi.org/10.2172/899364
Pless, Jason, Nenoff, Tina Maria, Garino, Terry J, and Axness, Marlene. Wed . "Tunable ionic-conductivity of collapsed Sandia octahedral molecular sieves (SOMS).". United States. https://doi.org/10.2172/899364. https://www.osti.gov/servlets/purl/899364.
@article{osti_899364,
title = {Tunable ionic-conductivity of collapsed Sandia octahedral molecular sieves (SOMS).},
author = {Pless, Jason and Nenoff, Tina Maria and Garino, Terry J and Axness, Marlene},
abstractNote = {This proposal focuses on the synthesis and characterization of ''tunable'' perovskite ceramics with resulting controlled strength and temperature of dielectric constants and/or with ionic conductivity. Traditional methods of synthesis involve high temperature oxide mixing and baking. We developed a new methodology of synthesis involving the (1) low temperature hydrothermal synthesis of metastable porous phases with ''tuned'' stoichiometry, and element types, and then (2) low temperature heat treatment to build exact stoichiometry perovskites, with the desired vacancy concentrations. This flexible pathway can lead to compositions and structures not attainable by conventional methods. During the course of this program, a series of Na-Nb perovskites were synthesized by calcining and collapsing microporous Sandia Octahedral Molecular Sieve (SOMS) phases. These materials were studied by various characterization techniques and conductivity measurements to better delineate stability and stoichiometry/bulk conductivity relationships. The conductivity can be altered by changing the concentration and type of the substituting framework cation(s) or by ion exchange of sodium. To date, the Na{sub 0.9}Mg{sub 0.1}Nb{sub 0.8}Ti{sub 0.2}O{sub 3-{delta}} shows the best conductivity.},
doi = {10.2172/899364},
url = {https://www.osti.gov/biblio/899364}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2006},
month = {11}
}