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Updated: Sep 15, 2025

Writing and Low-Temperature Characterization of Oxide Nanostructures

Writing and Low-Temperature Characterization of Oxide Nanostructures

Published on: July 18, 2014

Negative Compressibility Transitions in Hybrid Metal Oxides.

Raúl Torres-Cadena¹, W Lakna N Dayaratne¹, Hsing-Ta Chen¹

¹Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.

Journal of the American Chemical Society

|July 14, 2025

Summary

Researchers discovered novel layered hybrid organic-inorganic metal oxides exhibiting negative volume compressibility. This unique material property expands under pressure, opening new avenues for advanced technologies.

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Last Updated: Sep 15, 2025

Writing and Low-Temperature Characterization of Oxide Nanostructures

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Published on: July 18, 2014

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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Fabrication of Spatially Confined Complex Oxides

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Published on: July 1, 2013

Area of Science:

Materials Science
Solid-State Chemistry
Nanotechnology

Background:

Negative compressibility (NC) materials offer transformative potential in sensing, shielding, and optoelectronics.
Existing NC materials expand under pressure in one or two dimensions.
Thermodynamics theoretically permit three-dimensional compression-induced expansion only outside the elastic regime or during phase transitions.

Purpose of the Study:

To investigate layered hybrid organic-inorganic metal oxides for novel compressibility behaviors.
To explore the conditions and mechanisms behind negative volume compressibility in these materials.
To assess the impact of chemical modification on observed compressibility.

Main Methods:

Synthesis of layered hybrid organic-inorganic metal oxides via mild self-assembly.
Application of hydrostatic pressure to induce structural changes.
Crystallographic analysis to observe unit cell volume changes.
Chemical reduction to create mixed-valence hybrid bronzes.

Main Results:

Observed microscopic negative volume compressibility in the crystallographic unit cells of specific layered hybrid organic-inorganic metal oxides.
Demonstrated that the phenomenon is contingent on molecular species bridging two-dimensional metal oxide layers.
Found that chemical reduction to mixed-valence hybrid bronzes diminishes the negative compressibility effect.
Evidence suggests compression-induced intermolecular C-C bond formation and structural distortion drive interlayer expansion.

Conclusions:

Layered hybrid organic-inorganic metal oxides exhibit multiphase behavior under pressure, leading to negative volume compressibility.
The observed phenomenon is linked to specific structural features and can be modulated by chemical reduction.
This discovery challenges previous thermodynamic constraints and offers new material design principles for negative compressibility.