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Updated: Jun 19, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

Published on: April 16, 2017

EuI2, a low-temperature europium(II) iodide phase.

Michael Krings¹, Michael Wessel, Richard Dronskowski

¹Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany.

Acta Crystallographica. Section C, Crystal Structure Communications

|October 7, 2009

Summary

This summary is machine-generated.

A new light-yellow europium(II) diiodide (EuI2) phase was synthesized and characterized. This stable orthorhombic structure, confirmed by X-ray diffraction, represents the ground state of EuI2.

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Area of Science:

Solid-state chemistry
Inorganic materials science
Rare-earth element research

Background:

Europium diiodide (EuI2) exists in various forms.
Understanding the structural properties and stability of EuI2 is crucial for its applications.

Purpose of the Study:

To synthesize and characterize a new phase of europium(II) diiodide.
To determine the crystal structure and thermal stability of this new phase.
To computationally verify the ground-state structure of EuI2.

Main Methods:

Low-temperature synthesis using europium and ammonium iodide in liquid ammonia.
High-resolution X-ray powder diffraction for structural characterization.
Temperature-dependent X-ray diffraction for thermal stability analysis.
Total-energy density-functional calculations (generalized gradient approximation).

Main Results:

A new light-yellow phase of EuI2 was successfully prepared.
The new phase crystallizes in an orthorhombic Pnma structure, isotypic with SrI2(IV).
Thermal stability analysis revealed irreversible decomposition around 673 K.
Computational calculations confirmed this structure as the ground state of EuI2.

Conclusions:

The synthesized orthorhombic Pnma phase is the stable ground-state structure of europium(II) diiodide.
The new EuI2 phase exhibits limited thermal stability, decomposing at elevated temperatures.
This discovery provides fundamental insights into the solid-state chemistry of rare-earth diiodides.