Related Experiment Video
Updated: Jul 16, 2026
08:00
Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
Nonmonotonic TC trends in bi-based ferroelectric perovskite solid solutions
Ilya Grinberg1, Andrew M Rappe
1The Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
Physical Review Letters
|March 16, 2007
Summary
This study reveals that crystal chemical parameters accurately predict cation displacements in bismuth-lead (Bi-Pb) ferroelectric alloys. These findings correlate transition temperatures with polarization, explaining nonlinear Curie temperature trends.
Area of Science:
- Materials Science
- Solid-State Physics
- Computational Chemistry
Background:
- Ferroelectric materials exhibit spontaneous electric polarization.
- Bismuth-lead (Bi-Pb) titanate perovskite solid solutions are promising ferroelectric materials.
- Understanding compositional effects on ferroelectric properties is crucial for material design.
Purpose of the Study:
- To investigate nonlinear compositional trends in BiBO3-PbTiO3 solid solutions.
- To assess the predictive power of existing crystal chemical parameters for new Bi-Pb alloys.
- To establish correlations between material properties and transition temperatures.
Main Methods:
- First-principles density functional theory (DFT) calculations.
- Analysis of crystal chemical parameters from established lead-based perovskite alloys.
- Correlation analysis between computed polarization and observed transition temperatures.
Main Results:
- Accurate prediction of cation displacements in Bi-Pb alloys using prior crystal chemical parameters.
- Strong correlation between calculated polarization magnitudes and observed transition temperatures.
- Development of a model explaining nonlinear Curie temperature dependence on composition.
Conclusions:
- Crystal chemical parameters are effective for predicting cation behavior in novel ferroelectric solid solutions.
- Polarization magnitude is a key factor governing transition temperatures in these materials.
- The study provides a framework for understanding and designing ferroelectric materials with tailored properties.
Related Concept Videos
02:54Molecular and Ionic Solids
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
01:28Phase Diagrams of Ternary Systems
Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
02:54Trends in Lattice Energy: Ion Size and Charge
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
01:24Solid–Solid Solutions
The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.