Alkali environments in tellurite glasses

Alkali environments in tellurite glasses
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亚碲酸盐玻璃中的碱性环境

DOI:
10.1016/j.jnoncrysol.2015.01.023
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发表时间:
2015
影响因子:
3.5
通讯作者:
Barney E
Barney E
中科院分区:
材料科学2区
文献类型:
--
作者:
Barney E

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Neutron diffraction measurements are reported for five binary alkali tellurite glasses,xM2O · (100 −x)TeO2(containing 10 and 20 mol% K2O, 10 and 19 mol% Na2O, and 20 mol%7Li2O), together with23Na MAS NMR measurements for the sodium containing glasses. Differences between neutron correlation functions are used to extract information about the local environments of lithium and sodium. The Na–O bond length is 2.37(1) Å and the average Na–O coordination number,nNaO, decreases from 5.2(2) forx= 10 mol% Na2O to 4.6(1) forx= 19 mol% Na2O. The average Li–O coordination number,nLiO, is 3.9(1) for the glass withx= 20 mol% Li2O and the Li–O bond length is 2.078(2) Å. Asxincreases from 10 to 19 mol% Na2O, the23Na MAS NMR peak moves downfield, confirming an earlier report of a correlation of peak position with sodium coordination number. The close agreement of the maximum in the Te–O bond distribution for sodium and potassium tellurite glasses of the same composition, coupled with the extraction of reasonable alkali coordination numbers using isostoichiometric differences, gives strong evidence that the tellurium environment in alkali tellurites is independent of the size of the modifier cation used.
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