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The experimental results showed that a fully amorphous structure of bulk Ni-based metallic glass can be obtained with an appropriate ultrasonic vibration energy .
 concept or principle: experimental; concept or principle: amorphous structure; material: metallic glass; material: be; process parameter: ultrasonic vibration
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: experimental; concept or principle: amorphous structure; material: metallic glass; material: be; process parameter: ultrasonic vibration