Monatomic Amorphous Palladium via Controlled Thermal Cycling
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Solution Overview
Problem
The preparation of pure monatomic amorphous materials, such as palladium, is challenging due to the requirement of high cooling rates and limited material sizes in traditional methods, which restricts the discovery of new monatomic amorphous materials and optimization of preparation processes.
Innovation Solution
A method involving loading monatomic palladium powder on a silicon nitride substrate, heating it to 800-1000°C, and cooling it at an apparent rate greater than 10° C/second to produce monatomic amorphous palladium, allowing for a lower cooling rate and high stability, with an initial phase of face-centered cubic structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional rapid quenching method is used to prepare monatomic amorphous metal, then amorphous solid can be formed, but high cooling rate (10^7 K/s) and limited material size are required
Solution Approach 1:
The patent changes the preparation parameters by using a two-step process: first heating to 800-1000°C to melt the palladium, then rapidly cooling at a much lower rate (10-1000°C/s) to form the amorphous structure. This parameter change allows achieving amorphous formation without requiring extreme cooling rates, thereby improving preparation efficiency while maintaining structural stability
Solution Approach 2:
The patent applies preliminary heating action by heating the palladium to 800-1000°C before the cooling process. This preliminary action melts the crystalline structure and prepares the material in a molten state, which then can be rapidly cooled to form amorphous structure. This preliminary heating step is crucial for enabling the subsequent low-rate rapid cooling to succeed
2Stability of the object's composition
If high cooling rate (10^7 K/s) is applied to form amorphous solid, then amorphous structure is achieved, but material size is limited and process complexity increases
Solution Approach 1:
The patent fundamentally changes the cooling rate parameter from extreme values (10^7 K/s) to manageable values (10-1000°C/s). This parameter change simplifies the equipment requirements and process control, reducing device complexity while still achieving stable amorphous structure formation through the controlled heating and cooling cycle
3Stability of the object's composition
If face-centered cubic metal is used for amorphous preparation, then amorphous formation is difficult, but body-centered cubic metals show stronger amorphous forming ability
Solution Approach 1:
The patent changes the thermal processing parameters (heating to 800-1000°C followed by rapid cooling) to overcome the inherent difficulty of forming amorphous structures from face-centered cubic metals. These parameter changes enable palladium (an fcc metal) to successfully form amorphous structures, thereby expanding the adaptability of amorphous preparation to include fcc metals that were previously difficult to process
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 method enables the production of high-stability monatomic amorphous palladium, facilitating the investigation of metallic glass properties and offering promising applications in hydrogen storage and separation membranes.
Implementation Method 1
heating it to 800-1000°C
Implementation Method 2
cooling it at an apparent rate greater than 10° C/second
Implementation Method 3
melting the nano-metal in the middle of the bridge with a nanosecond electric pulse method and rapidly quenching the molten metal into an amorphous matter
Data Source
AI summary
Provided is a monatomic amorphous palladium, a method for preparing the same and use thereof. The method comprises a) loading a monatomic palladium powder on a silicon nitride substrate; b) heating the silicon nitride substrate loaded with the monatomic palladium powder obtained in a) up to a temperature of 800° C. to 1000° C. and keeping the temperature for at least 3 minutes; and c) cooling a system of palladium and silicon nitride obtained in b) to room temperature at an apparent cooling rate greater than 103° C./second, thus obtaining the monatomic amorphous palladium.