TY - JOUR
T1 - Structures and visco-elastic properties of potassium tellurite
T2 - Glass versus melt
AU - Kieffer, John
AU - Johnson, Jacqueline A.
AU - Nickolayev, Oleg
AU - Bass, Jay D.
PY - 2006/1/25
Y1 - 2006/1/25
N2 - The structure and visco-elastic properties of K2Te 4O9 have been examined as a function of temperature, using neutron scattering and Brillouin light scattering, respectively. The neutron scattering data indicate that the coordination of tellurium by oxygen changes notably once the material is heated above the glass transition temperature. This and the associated decrease in elastic modulus are consistent with converting network building blocks from trigonal bipyramids to trigonal pyramids. The latter form chain-like structures that constitute a liquid characterized by a single relaxation mechanism. Structural relaxation in the liquid results in further decrease of its elastic storage capacity and in a maximum of dissipative losses due to viscous processes. The break-up of the glassy network, which is attributed to a frictionless transformation of building blocks, is distinct from the viscous relaxation of the liquid; their visco-elastic signatures can be observed in separate temperature intervals.
AB - The structure and visco-elastic properties of K2Te 4O9 have been examined as a function of temperature, using neutron scattering and Brillouin light scattering, respectively. The neutron scattering data indicate that the coordination of tellurium by oxygen changes notably once the material is heated above the glass transition temperature. This and the associated decrease in elastic modulus are consistent with converting network building blocks from trigonal bipyramids to trigonal pyramids. The latter form chain-like structures that constitute a liquid characterized by a single relaxation mechanism. Structural relaxation in the liquid results in further decrease of its elastic storage capacity and in a maximum of dissipative losses due to viscous processes. The break-up of the glassy network, which is attributed to a frictionless transformation of building blocks, is distinct from the viscous relaxation of the liquid; their visco-elastic signatures can be observed in separate temperature intervals.
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U2 - 10.1088/0953-8984/18/3/009
DO - 10.1088/0953-8984/18/3/009
M3 - Article
AN - SCOPUS:32644432055
SN - 0953-8984
VL - 18
SP - 903
EP - 914
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 3
ER -