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Title: Sealing glass-ceramics with near-linear thermal strain, Part II: Sequence of crystallization and phase stability

Abstract

The sequence of crystallization in a recrystallizable lithium silicate sealing glass-ceramic Li 2O–SiO 2–Al 2O 3–K 2O–B 2O 3–P 2O 5–ZnO was analyzed by in situ high-temperature X-ray diffraction (HTXRD). Glass-ceramic specimens have been subjected to a two-stage heat-treatment schedule, including rapid cooling from sealing temperature to a first hold temperature 650°C, followed by heating to a second hold temperature of 810°C. Notable growth and saturation of Quartz was observed at 650°C (first hold). Cristobalite crystallized at the second hold temperature of 810°C, growing from the residual glass rather than converting from the Quartz. The coexistence of quartz and cristobalite resulted in a glass-ceramic having a near-linear thermal strain, as opposed to the highly nonlinear glass-ceramic where the cristobalite is the dominant silica crystalline phase. HTXRD was also performed to analyze the inversion and phase stability of the two types of fully crystallized glass-ceramics. While the inversion in cristobalite resembles the character of a first-order displacive phase transformation, i.e., step changes in lattice parameters and thermal hysteresis in the transition temperature, the inversion in quartz appears more diffuse and occurs over a much broader temperature range. Furthermore, localized tensile stresses on quartz and possible solid-solution effects have been attributed tomore » the transition behavior of quartz crystals embedded in the glass-ceramics.« less

Authors:
 [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1329625
Alternate Identifier(s):
OSTI ID: 1400786
Report Number(s):
SAND-2016-10170J
Journal ID: ISSN 0002-7820; 648181
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Name: Journal of the American Ceramic Society; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; glass-ceramics; crystals/crystallization; thermal expansion; X-ray methods

Citation Formats

Rodriguez, Mark A., Griego, James J. M., and Dai, Steve. Sealing glass-ceramics with near-linear thermal strain, Part II: Sequence of crystallization and phase stability. United States: N. p., 2016. Web. doi:10.1111/jace.14438.
Rodriguez, Mark A., Griego, James J. M., & Dai, Steve. Sealing glass-ceramics with near-linear thermal strain, Part II: Sequence of crystallization and phase stability. United States. doi:10.1111/jace.14438.
Rodriguez, Mark A., Griego, James J. M., and Dai, Steve. Mon . "Sealing glass-ceramics with near-linear thermal strain, Part II: Sequence of crystallization and phase stability". United States. doi:10.1111/jace.14438. https://www.osti.gov/servlets/purl/1329625.
@article{osti_1329625,
title = {Sealing glass-ceramics with near-linear thermal strain, Part II: Sequence of crystallization and phase stability},
author = {Rodriguez, Mark A. and Griego, James J. M. and Dai, Steve},
abstractNote = {The sequence of crystallization in a recrystallizable lithium silicate sealing glass-ceramic Li2O–SiO2–Al2O3–K2O–B2O3–P2O5–ZnO was analyzed by in situ high-temperature X-ray diffraction (HTXRD). Glass-ceramic specimens have been subjected to a two-stage heat-treatment schedule, including rapid cooling from sealing temperature to a first hold temperature 650°C, followed by heating to a second hold temperature of 810°C. Notable growth and saturation of Quartz was observed at 650°C (first hold). Cristobalite crystallized at the second hold temperature of 810°C, growing from the residual glass rather than converting from the Quartz. The coexistence of quartz and cristobalite resulted in a glass-ceramic having a near-linear thermal strain, as opposed to the highly nonlinear glass-ceramic where the cristobalite is the dominant silica crystalline phase. HTXRD was also performed to analyze the inversion and phase stability of the two types of fully crystallized glass-ceramics. While the inversion in cristobalite resembles the character of a first-order displacive phase transformation, i.e., step changes in lattice parameters and thermal hysteresis in the transition temperature, the inversion in quartz appears more diffuse and occurs over a much broader temperature range. Furthermore, localized tensile stresses on quartz and possible solid-solution effects have been attributed to the transition behavior of quartz crystals embedded in the glass-ceramics.},
doi = {10.1111/jace.14438},
journal = {Journal of the American Ceramic Society},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 22 00:00:00 EDT 2016},
month = {Mon Aug 22 00:00:00 EDT 2016}
}

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Works referenced in this record:

Crystallization of a Glass-Ceramic by Epitaxial Growth
journal, September 1984


Design of High Thermal Expansion Glass-Ceramics Through Microstructural Control
book, January 1987


Thermal Expansion Properties of Some Synthetic Lithia Minerals
journal, August 1951


Crystallization Kinetics of a Complex Lithium Silicate Glass-Ceramic
journal, August 1987