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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
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Compromising Between Phase Stability and Electrical Performance: SrVO3 -SrTiO3 Solid Solutions as Solid Oxide Fuel

Javier Macías1, Aleksey A Yaremchenko1, Enrique Rodríguez-Castellón2

  • 1CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193, Aveiro, Portugal.

Chemsuschem
|October 4, 2018
PubMed
Summary
This summary is machine-generated.

Solid solutions of strontium vanadate-strontium titanate (SrVO3-SrTiO3) improve phase stability for high-temperature energy applications. Titanium substitution enhances stability while maintaining good electrical conductivity and reducing thermochemical expansion.

Keywords:
electrical conductivityfuel cellsstabilitytitanatesvanadates

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Strontium vanadate (SrVO3-δ) perovskites are crucial for high-temperature electrochemical energy conversion.
  • Limited phase stability under oxidizing conditions restricts the operational window of SrVO3-δ.
  • The need for enhanced stability without significant performance loss is critical for practical applications.

Purpose of the Study:

  • To design SrV1-yTiyO3-δ solid solutions within the SrVO3-SrTiO3 system.
  • To investigate the compromise between phase stability and electrical performance.
  • To understand the effect of titanium substitution on oxygen stoichiometry, stability, and electrical properties.

Main Methods:

  • Synthesis of SrV1-yTiyO3-δ solid solutions with varying titanium content (y=0-0.9).
  • Characterization using X-ray diffraction (XRD) and thermogravimetric analysis (TGA).
  • Electrical conductivity measurements as a function of temperature and oxygen partial pressure (p(O2)).

Main Results:

  • Increasing titanium content shifts the upper p(O2) phase stability boundary to more oxidizing conditions.
  • SrV0.7Ti0.3O3-δ and SrV0.5Ti0.5O3-δ exhibit high electrical conductivities (80 and 20 S cm⁻¹, respectively) at 900°C.
  • Titanium substitution decreases oxygen deficiency, suppresses thermochemical expansion, and shows sluggish oxidation kinetics.

Conclusions:

  • SrV1-yTiyO3-δ solid solutions offer an improved balance of phase stability and electrical conductivity for energy applications.
  • The study demonstrates a viable strategy for enhancing perovskite stability through aliovalent substitution.
  • The findings provide insights into defect chemistry and material design for demanding electrochemical environments.