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Rare-earth and actinide compounds
Research Guide
What is Rare-earth and actinide compounds?
Rare-earth and actinide compounds are chemical compounds containing elements from the lanthanide series (rare earths) or actinide series, often exhibiting unique electronic, magnetic, and structural properties due to their f-orbitals.
The field encompasses 103,591 published works focused on the synthesis, electronic structure, and properties of these compounds. Key computational methods include Vanderbilt's 'Soft self-consistent pseudopotentials in a generalized eigenvalue formalism' (1990) with 22,549 citations and the LDA+U method in 'First-principles calculations of the electronic structure and spectra of strongly correlated systems: the LDA+U method' (1997) for strongly correlated f-electron systems. Experimental highlights feature superconductors like La[O1-xFx]FeAs with Tc=26 K from 'Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 K' (2008).
Research Sub-Topics
LDA+U Method
This sub-topic covers the LDA+U approach for treating strongly correlated f-electron systems in rare-earth and actinide compounds. Researchers refine Hubbard U parameters, applications to DFT+U, and beyond-DFT extensions.
Heavy Fermion Systems
This sub-topic focuses on Kondo lattice physics, quantum criticality, and unconventional superconductivity in actinide heavy fermions. Researchers study non-Fermi liquid behavior and pressure-induced phase transitions.
Soft Pseudopotentials
This sub-topic examines norm-conserving pseudopotentials in generalized eigenvalue formalisms for f-electron calculations. Researchers develop ultrasoft and PAW variants for high-throughput rare-earth compound screening.
Giant Magnetoresistance
This sub-topic addresses colossal/GMR in perovskite manganites and rare-earth intermetallics near magnetic transitions. Researchers elucidate double-exchange mechanisms and strain effects on CMR properties.
Rare-earth Covalent Radii
This sub-topic covers empirical covalent radius tables for lanthanides and actinides in molecular compounds. Researchers validate against experimental structures and develop relativistic corrections.
Why It Matters
Rare-earth and actinide compounds enable applications in high-temperature superconductivity, as shown by Kamihara et al. (2008) in 'Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 K', achieving Tc=26 K at 11 atom% F doping, impacting power transmission and magnetic levitation technologies. Giant magnetoresistance in La2/3Ba1/3MnOx films, with ΔR/R(H=0)=60% at room temperature reported by von Helmolt et al. (1993) in '"Giant negative magnetoresistance in perovskitelike La2/3Ba1/3MnOx ferromagnetic films"', supports hard disk drive read heads in data storage industries. Recent separation strategies in '"Selective crystallization strategies for lanthanide–lanthanide and lanthanide–actinide separations"' address challenges in REE ores co-occurring with actinides like Th, vital for high-tech electronics and nuclear fuel cycles. The discovery of berkelocene, the first characterized organometallic molecule with berkelium by Berkeley Lab researchers, advances transuranium chemistry for potential nuclear applications.
Reading Guide
Where to Start
"Soft self-consistent pseudopotentials in a generalized eigenvalue formalism" by Vanderbilt (1990) provides foundational pseudopotential methods essential for all first-principles calculations on f-electron compounds.
Key Papers Explained
Vanderbilt (1990) '"Soft self-consistent pseudopotentials in a generalized eigenvalue formalism"' enables accurate pseudopotentials, which Anisimov et al. (1997) extend via LDA+U in '"First-principles calculations of the electronic structure and spectra of strongly correlated systems: the LDA+U method"' for Mott insulators; Blaha et al. (1990) '"Full-potential, linearized augmented plane wave programs for crystalline systems"' builds on these for full-potential calculations. Villars (1997) '"Pearson\'s handbook : crystallographic data for intermetallic phases"' supplies experimental structural data to validate computations. Kamihara et al. (2008) '"Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 K"' demonstrates rare-earth applications in superconductivity.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Recent preprints focus on separations via '"Selective crystallization strategies for lanthanide–lanthanide and lanthanide–actinide separations"' and '"Exploiting the coordination chemistry of high-valent americium for actinide/lanthanide separations"'; structural studies in '"Selected structural highlights of f-element compounds"' cover actinide oxides and carbides; transuranium organometallics advance with berkelocene discovery by Berkeley Lab.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Soft self-consistent pseudopotentials in a generalized eigenva... | 1990 | Physical review. B, Co... | 22.5K | ✕ |
| 2 | Iron-Based Layered Superconductor La[O<sub>1-</sub><i><sub>x</... | 2008 | Journal of the America... | 7.7K | ✕ |
| 3 | Doping a Mott insulator: Physics of high-temperature supercond... | 2006 | Reviews of Modern Physics | 4.4K | ✕ |
| 4 | Pearson's handbook : crystallographic data for intermetallic p... | 1997 | Medical Entomology and... | 4.3K | ✕ |
| 5 | Magnetization of Hard Superconductors | 1962 | Physical Review Letters | 4.3K | ✕ |
| 6 | First-principles calculations of the electronic structure and ... | 1997 | Journal of Physics Con... | 4.0K | ✕ |
| 7 | Giant negative magnetoresistance in perovskitelike<mml:math xm... | 1993 | Physical Review Letters | 4.0K | ✕ |
| 8 | Covalent radii revisited | 2008 | Dalton Transactions | 4.0K | ✕ |
| 9 | Full-potential, linearized augmented plane wave programs for c... | 1990 | Computer Physics Commu... | 3.4K | ✕ |
| 10 | The Kondo Problem to Heavy Fermions | 1993 | Cambridge University P... | 3.1K | ✕ |
In the News
Scientists discover new heavy-metal molecule 'berkelocene'
A research team led by the Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) has discovered “berkelocene,” the first organometallic molecule to be characterized containing...
Scientists create the world's first organometallic molecule
**Related Stories**
Scientists Discover New Heavy-Metal Molecule 'Berkelocene'
A research team led by the Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) has discovered “berkelocene,” the first organometallic molecule to be characterized containing...
Researchers Create New Heavy-Metal Molecule ‘Berkelocene’
## Funding
Transuranium organometallic chemistry
008. Seaborg, G. T. & Loveland, W. D. _Elements Beyond Uranium_ (Wiley, 1991). 009. Seaborg, G. T. in _Handbook on the Physics and Chemistry of Rare Earths_ Vol. 18 (eds Gschneidner, K. A. Jr. & E...
Code & Tools
Crystal field calculations for the Rare Earths - Free software: GNU General Public License v3 - Documentation: https://dieke.readthedocs.io . - Re...
AlphaZero-style reinforcement learning. Code under development as part of the End-to-End Optimization for Battery Materials and Molecules by Combin...
Reaction Network (`rxn\_network`) is a Python package for synthesis planning and predicting chemical reaction pathways in inorganic materials synth...
Architector is a 3D chemical structure generation software package designed to take minimal 2D information about ligands and metal centers and gene...
)dyn.run(steps=1000) ``` ### LICENSE `fairchem`is available under a MIT License . Models/checkpoint licenses vary by application area. ## About F...
Recent Preprints
Selective crystallization strategies for lanthanide–lanthanide and lanthanide–actinide separations
Rare-earth elements (REEs), including lanthanides, are vital for high-tech applications; however, their nearly identical trivalent ionic radii and coordination behaviour make individual separation ...
Exploiting the coordination chemistry of high-valent americium for actinide/lanthanide separations
To enable sustainable development of nuclear energy, the concept of an advanced nuclear fuel cycle based on the so-called “partitioning and transmutation” (P/T) strategy has been proposed, by which...
Selected structural highlights of f-element compounds
The present compilation covers our experimental and theoretical studies on the structural, vibrational and bonding properties of the following f-element compounds: - Simple f-element halides and o...
Transuranium organometallic chemistry
009. Seaborg, G. T. in _Handbook on the Physics and Chemistry of Rare Earths_ Vol. 18 (eds Gschneidner, K. A. Jr. & Eyring, L.) 1–27 (Elsevier, 1994). 010. Balasubramanian, K. in _Handbook on the ...
Reviewer Spotlight – Chemical Science Blog
**Dr Ana Bahamonde, University of California Riverside.** Our group focuses on advancing the understanding of Ni catalysis, specifically addressing its tendency to alternate between 1- and 2-electr...
Latest Developments
Recent developments in rare-earth and actinide compounds research include the creation of the first organometallic molecule containing berkelium, "berkelocene," which provides insights into actinide–carbon bonding and nuclear waste management strategies (energy.gov, science.org). Additionally, advances have been made in synthesizing actinide-based metal-organic frameworks (An-MOFs) with diverse structures and potential applications in gas capture and catalysis (sciencedirect.com). Other notable progress includes the development of new synthesis techniques for heavy actinide compounds, such as americium and curium, which are crucial for nuclear waste management and radiopharmaceuticals (phys.org). As of February 2026, these studies continue to expand understanding of actinide chemistry and materials (energy.gov).
Sources
Frequently Asked Questions
What computational methods are used for rare-earth and actinide compounds?
Vanderbilt (1990) introduced soft self-consistent pseudopotentials in '"Soft self-consistent pseudopotentials in a generalized eigenvalue formalism"', improving transferability for f-electron systems with 22,549 citations. Anisimov et al. (1997) developed the LDA+U method in '"First-principles calculations of the electronic structure and spectra of strongly correlated systems: the LDA+U method"' to correctly describe Mott insulators in strongly correlated f-systems. Blaha et al. (1990) provided full-potential linearized augmented plane wave programs in '"Full-potential, linearized augmented plane wave programs for crystalline systems"' for accurate crystalline calculations.
How are superconducting properties studied in these compounds?
Kamihara et al. (2008) reported Tc=26 K in F-doped LaOFeAs in '"Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 K"', with Tc peaking at 11 atom% F. Bean (1962) modeled magnetization in hard superconductors in '"Magnetization of Hard Superconductors"'. Lee et al. (2006) reviewed doping Mott insulators for high-Tc superconductivity in '"Doping a Mott insulator: Physics of high-temperature superconductivity"'.
What structural data resources exist for these compounds?
Villars (1997) compiled crystallographic data in '"Pearson\'s handbook : crystallographic data for intermetallic phases"' with 4,320 citations, covering intermetallic phases including rare-earth compounds. Cordero et al. (2008) provided covalent radii up to atomic number 96 in '"Covalent radii revisited"', enabling interpolation for actinides lacking structural data.
What are current separation challenges for lanthanides and actinides?
Selective crystallization strategies in '"Selective crystallization strategies for lanthanide–lanthanide and lanthanide–actinide separations"' target nearly identical trivalent ionic radii and coordination behavior of REEs and actinides like Th in ores. High-valent americium coordination chemistry in '"Exploiting the coordination chemistry of high-valent americium for actinide/lanthanide separations"' supports partitioning and transmutation for nuclear fuel cycles.
What recent organometallic advances involve actinides?
Berkeley Lab discovered berkelocene, the first characterized organometallic molecule containing berkelium, as reported in news coverage from March 2025. '"Transuranium organometallic chemistry"' reviews progress referencing Seaborg's work on elements beyond uranium.
Open Research Questions
- ? How can LDA+U parameters be optimized for predicting properties of undiscovered actinide organometallics like berkelocene?
- ? What crystallization conditions enable scalable lanthanide-actinide separations from REE ores co-occurring with Th?
- ? How do high-valent americium coordination environments improve partitioning efficiency in advanced nuclear fuel cycles?
- ? What structural motifs in mixed alkali metal/actinide oxide complexes stabilize novel f-element bonding?
- ? How do crystal field effects in rare-earth compounds influence heavy fermion behavior beyond the Kondo model?
Recent Trends
Preprints from August 2025 emphasize separations, with '"Selective crystallization strategies for lanthanide–lanthanide and lanthanide–actinide separations"' addressing REE-Th co-occurrence and '"Exploiting the coordination chemistry of high-valent americium for actinide/lanthanide separations"' for nuclear P/T strategies.
Berkeley Lab's March 2025 discovery of berkelocene marks the first characterized berkelium organometallic.
Structural compilations in '"Selected structural highlights of f-element compounds"' and '"Transuranium organometallic chemistry"' reference Seaborg's foundational work.
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