期刊
JOURNAL OF CHEMICAL PHYSICS
卷 135, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3643327
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资金
- NSF-DMR [0907060]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [906070] Funding Source: National Science Foundation
The thermodynamic nature of phase stabilities and transformations are investigated in crystalline and amorphous Ge1Sb2Te4 (GST124) phase change materials as a function of pressure and temperature using high-resolution synchrotron x-ray diffraction in a diamond anvil cell. The phase transformation sequences upon compression, for cubic and hexagonal GST124 phases are found to be: cubic -> amorphous -> orthorhombic -> bcc and hexagonal -> orthorhombic -> bcc. The Clapeyron slopes for melting of the hexagonal and bcc phases are negative and positive, respectively, resulting in a pressure dependent minimum in the liquidus. When taken together, the phase equilibria relations are consistent with the presence of polyamorphism in this system with the as-deposited amorphous GST phase being the low entropy low-density amorphous phase and the laser melt-quenched and high-pressure amorphized GST being the high entropy high-density amorphous phase. The metastable phase boundary between these two polyamorphic phases is expected to have a negative Clapeyron slope. (C) 2011 American Institute of Physics. [doi:10.1063/1.3643327]
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