Comment on “First-Order Amorphous-Amorphous Transformation in Silica”
نویسندگان
چکیده
منابع مشابه
Thermal conductivity accumulation in amorphous silica and amorphous silicon
We predict the properties of the propagating and nonpropagating vibrational modes in amorphous silica (a-SiO2) and amorphous silicon (a-Si) and, from them, thermal conductivity accumulation functions. The calculations are performed using molecular dynamics simulations, lattice dynamics calculations, and theoretical models. For a-SiO2, the propagating modes contribute negligibly to thermal condu...
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This work is focused on the effect of amorphous SiO2 addition on the phase transformation and microstructural evolution of ZrO2 particles. Considering the structural similarities between the amorphous ZrO2 and its tetragonal structure, XRD results showed initial nucleation of metastable tetragonal ZrO2 from its amorphous matrix upon heat treatment. This metastable phase is unstable in pure ZrO2...
متن کاملKinetics of a first-order crystalline-amorphous transformation in zirconium tungstate
Xiaozhi Yan,1,2,* Xiangting Ren,2 Guangai Sun,1 Dong Li,3 Xin Li,1,3 Duanwei He,3,† and Wenge Yang2,4 1Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, People’s Republic of China 2Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, People’s Republic of China 3Institute of Atomic and Molecular Physics, Sic...
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The pressure-induced phase transition in amorphous silicon ~a-Si! is studied using ab initio constantpressure molecular-dynamic simulations. Crystalline silicon ~c-Si! shows a phase transformation from diamond-to-simple hexagonal at 29.5 GPa, whereas a-Si presents an irreversible sharp transition to an amorphous metallic phase at 16.25 GPa. The transition pressure of a-Si is also calculated fro...
متن کاملComment on "low temperature acoustic properties of amorphous silica and the tunneling model".
Internal friction and speed of sound were measured on a-SiO2 above 6 mK using a torsional oscillator at 90 kHz, controlling for thermal decoupling, vibrational heating, background losses, and nonlinear effects. Strain amplitudes epsilon(A) = 10(-8) mark the transition between the linear and nonlinear regimes. In the former, agreement with the tunneling model was observed for both internal frict...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2001
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.86.3206