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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
Structural transformation of Sb-based high-speed phase-change material
Toshiyuki Matsunaga1, Rie Kojima, Noboru Yamada
1Device Solutions Center, R&D Division, Panasonic Corporation, 3-1-1 Yagumo-Nakamachi, Moriguchi, Osaka 570-8501, Japan. matsunaga.toshiyuki@jp.panasonic.com
Acta Crystallographica. Section B, Structural Science
|November 21, 2012
Summary
Phase-change materials transform from amorphous to crystalline states around 416 K, exhibiting an A7-type structure. Further heating causes phase separation into AgInTe(2) and Sb-Te, with Sb-Te undergoing gradual structural changes.
Area of Science:
- Materials Science
- Crystallography
- Solid-State Chemistry
Background:
- Phase-change materials are crucial for data storage applications.
- Understanding their structural transformations under thermal stress is key to optimizing device performance.
Purpose of the Study:
- To investigate the temperature-dependent crystal structure of Ag(3.4)In(3.7)Sb(76.4)Te(16.5).
- To elucidate the phase transitions and structural evolution of this phase-change material.
Main Methods:
- High-temperature X-ray diffraction using a large Debye-Scherrer camera at SPring-8.
- In-situ structural analysis during a heating process.
Main Results:
- Amorphous to crystalline phase transition observed at approximately 416 K, forming an A7-type structure.
- The A7-type structure remained stable up to 545 K, showing thermal expansion.
- Above 545 K, phase separation into AgInTe(2) and Sb-Te occurred.
- AgInTe(2) maintained its structure, while Sb-Te exhibited gradual structural changes with increasing temperature, characterized by modulation period growth.
Conclusions:
- The study reveals the complex structural behavior of Ag-In-Sb-Te phase-change materials under thermal cycling.
- The observed phase separation and Sb-Te structural evolution provide insights for designing stable and efficient phase-change memory devices.
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