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Influence of cation species on thermal expansion of Y2Si2O7–Gd2Si2O7 solid solutions

Journal Article · · Journal of Solid State Chemistry
 [1];  [1];  [1];  [2];  [3];  [4]
  1. NASA Glenn Research Center, Cleveland, OH (United States)
  2. NASA Langley Research Center, Hampton, VA (United States)
  3. Univ. of Pittsburgh, PA (United States); National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States)
  4. Pennsylvania State Univ., University Park, PA (United States)

Mixtures of Y2Si2O7 and Gd2Si2O7 were synthesized by solid-state reaction at 1600°C and characterized via in situ x-ray diffraction (XRD) to determine their coefficients of thermal expansion (CTE). All solid solutions within the system exhibited the orthorhombic δ-RE2Si2O7 (Pna21) structure. Thermal expansion measurements of Y2Si2O7 and Gd2Si2O7 correlated well with reported values in literature, and all synthesized solid solutions exhibited CTEs between Y2Si2O7 and Gd2Si2O7. Generally, there was a slight decrease in CTE exhibited by the materials with increasing Gd2Si2O7 content, with Gd2Si2O7 having the lowest CTEs and Y2Si2O7 the highest CTEs. Here, the decrease in CTE was attributed to stronger bonds of Gd-O over Y-O, as determined by calculated crystal orbital Hamilton populations using density functional theory. However, such differences were very small and crystal structure was the dominating factor in CTE trends.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM)
OSTI ID:
2520164
Journal Information:
Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2023 Vol. 327; ISSN 0022-4596
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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