Tri-State Phase Transformation in Hydrogenated Transition Metal Oxide
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Solution Overview
Problem
Current methods are unable to achieve a tri-state phase transformation in hydrogen-containing transition metal oxides, limiting the regulation of electrical, optical, and magnetic properties through an electric field.
Innovation Solution
A phase transformation electronic device is developed, comprising a hydrogen-containing transition metal oxide layer and an ionic liquid layer, allowing for tri-state phase transformation by regulating the hydrogen-containing transition metal oxide via an electric field, with the ionic liquid providing hydrogen and oxygen ions to control the phase changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional hydrogenation or thermal oxidation methods are used, then phase transformation can be achieved, but only binary phase transformation (two states) is possible
Solution Approach 1:
An ionic liquid layer is introduced as an intermediary between the transition metal oxide layer and the electrode. This ionic liquid mediates the phase transformation process by providing mobile H+ and O2- ions that can be transported into or out of the oxide layer under electric field control, enabling the material to cycle through three distinct phases (metallic, insulating, and intermediate states) rather than just two states.
Solution Approach 2:
The invention changes the controlling parameter from thermal treatment (temperature-based) to electric field control (voltage-based). By applying different voltages to the electrode, the ionic liquid facilitates reversible insertion/extraction of H+ and O2- ions, dynamically adjusting the hydrogen and oxygen content in the transition metal oxide to achieve three stable phases with distinct electrical, optical, and magnetic properties.
2Productivity
If thermal hydrogenation methods are used, then hydrogen-containing transition metal oxide can be formed, but the process requires high temperature and cannot achieve tri-state transformation
Solution Approach 1:
The invention replaces the thermal field (heat-based hydrogenation) with an electric field-based system. Instead of using high temperature to drive hydrogen diffusion into the oxide, an electric field is applied to drive ionic liquid electrolytes to transport H+ ions into or out of the oxide layer at room temperature, achieving rapid and reversible phase transformation.
Solution Approach 2:
The ionic liquid acts as a fluid medium that transports ions to and from the oxide layer. Similar to how hydraulic systems use fluid to transmit force, this system uses ionic liquid to transmit H+ and O2- ions, enabling controlled phase transformation without thermal processing.
3Adaptability or versatility
If electric field control is implemented with ionic liquid, then tri-state phase transformation is achieved, but device structure becomes more complex
Solution Approach 1:
The transition metal oxide layer serves multiple functions simultaneously: it provides the phase transformation capability, exhibits distinct electrical properties (metallic/insulating states), shows optical modulation (electrochromic effects), and displays magnetic property changes. This multi-functionality in a single material layer offsets the added structural complexity of the device.
Solution Approach 2:
The invention merges the functions of multiple separate components into an integrated structure. The ionic liquid layer and oxide layer are combined in a sandwich configuration where the ionic liquid provides ion transport while the oxide provides the functional response, creating a compact device that achieves tri-state transformation without requiring separate control mechanisms for each property.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables simultaneous regulation of electrical, optical, and magnetic properties, achieving metal-insulator transformations, dual-band electrochromic effects, and tri-state magnetoelectric coupling, deepening understanding of electric field-controlled ionic storage and transportation, and providing a basis for novel crystal structure design.
Implementation Method 1
The ionic liquid layer is capable of providing hydrogen ions and oxygen ions
Implementation Method 2
regulating a transformation of a hydrogen-containing transition metal oxide via an electric field
Implementation Method 3
achieve a tri-state phase transformation by regulating the hydrogen-containing transition metal oxide
Implementation Method 4
achieving metal-insulator transformations
Implementation Method 5
dual-band electrochromic effects
Implementation Method 6
tri-state magnetoelectric coupling
Data Source
AI summary
A phase transformation electronic device comprises: a first conductive layer; a second conductive layer opposite to and spaced from the first conductive layer; a phase transformation material layer disposed between the first conductive layer and the second conductive layer, wherein the phase transformation material layer is formed by a hydrogen-containing transition metal oxide having a structural formula of ABOxHy, wherein A is one or more of alkaline earth metal elements and rare-earth metal elements, B is one or more of transition metal elements, x is a numeric value in a range of 1 to 3, and y is a numeric value in a range of 0 to 2.5; and an ionic liquid layer disposed between the phase transformation material layer and the first conductive layer, wherein the ionic liquid layer is capable of providing hydrogen ions and oxygen ions.