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Structure of bismuth tellurite and bismuth niobium tellurite glasses and Bi2Te4O11 anti-glass by high energy X-ray diffraction
RSC Advances ( IF 3.9 ) Pub Date : 2020-4-2 , DOI: 10.1039/d0ra01422b Nupur Gupta 1 , Atul Khanna 1 , Hirdesh 1 , Ann-Christin Dippel 2 , Olof Gutowski 2
RSC Advances ( IF 3.9 ) Pub Date : 2020-4-2 , DOI: 10.1039/d0ra01422b Nupur Gupta 1 , Atul Khanna 1 , Hirdesh 1 , Ann-Christin Dippel 2 , Olof Gutowski 2
Affiliation
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Glass and anti-glass samples of bismuth tellurite (xBi2O3–(100 − x)TeO2) and bismuth niobium tellurite (xBi2O3–xNb2O5–(100 − 2x)TeO2) systems were prepared by melt-quenching. The bismuth tellurite system forms glasses at low Bi2O3 concentration of 3 to 7 mol%. At 20 mol% Bi2O3, the glass forming ability of the Bi2O3–TeO2 system decreases drastically and the anti-glass phase of monoclinic Bi2Te4O11 is produced. Structures of glass and the anti-glass Bi2Te4O11 samples were studied by high-energy X-ray diffraction, reverse Monte Carlo simulations and Rietveld Fullprof refinement. All glasses have short short-range disorder due to the existence of at least three types of Te–O bonds of lengths: 1.90, 2.25 and 2.59 Å, besides a variety of Bi–O and Nb–O bond-lengths. The medium-range order in glasses is also disturbed due to the distribution of Te–Te pair distances. The average Te–O co-ordination (NTe–O) in the glass network decreases with an increase in Bi2O3 and Nb2O5 mol% and is in the range: 4.17 to 3.56. The anti-glass Bi2Te4O11 has a long-range order of cations but it has vibrational disorder and it exhibits sharp X-ray reflections but broad vibrational bands similar to that in glasses. Anti-glass Bi2Te4O11 has an NTe–O of 2.96 and is significantly lower than in glass samples.
中文翻译：
碲酸铋和铌铌碲酸盐玻璃和Bi2Te4O11抗玻璃的高能X射线衍射结构
亚碲酸铋 ( x Bi 2 O 3 –(100 - x )TeO 2 ) 和亚碲酸铋铌 ( x Bi 2 O 3 – x Nb 2 O 5 –(100 - 2 x )TeO 2 )的玻璃和防玻璃样品通过熔融淬火制备系统。亚碲酸铋体系在 3 至 7 mol% 的低 Bi 2 O 3浓度下形成玻璃。在 20 mol% Bi 2 O 3下，Bi 2 O 3 –TeO 2的玻璃形成能力体系急剧下降，产生单斜晶系Bi 2 Te 4 O 11的抗玻璃相。通过高能 X 射线衍射、反向蒙特卡罗模拟和 Rietveld Fullprof 改进研究了玻璃和抗玻璃 Bi 2 Te 4 O 11样品的结构。由于存在至少三种长度的 Te-O 键：1.90、2.25 和 2.59 Å，除了各种 Bi-O 和 Nb-O 键长之外，所有玻璃都具有短程无序。由于 Te-Te 对距离的分布，玻璃中的中程有序也受到干扰。玻璃网络中的平均 Te-O 配位 ( N Te-O ) 随着 Bi 的增加而降低2 O 3和 Nb 2 O 5 mol%，范围为：4.17 至 3.56。抗玻璃Bi 2 Te 4 O 11的阳离子具有长程有序，但具有振动无序，呈现出尖锐的X射线反射，但具有与玻璃相似的宽振动带。抗玻璃 Bi 2 Te 4 O 11的N Te-O为 2.96，明显低于玻璃样品。
更新日期：2020-04-02
中文翻译：
碲酸铋和铌铌碲酸盐玻璃和Bi2Te4O11抗玻璃的高能X射线衍射结构
亚碲酸铋 ( x Bi 2 O 3 –(100 - x )TeO 2 ) 和亚碲酸铋铌 ( x Bi 2 O 3 – x Nb 2 O 5 –(100 - 2 x )TeO 2 )的玻璃和防玻璃样品通过熔融淬火制备系统。亚碲酸铋体系在 3 至 7 mol% 的低 Bi 2 O 3浓度下形成玻璃。在 20 mol% Bi 2 O 3下，Bi 2 O 3 –TeO 2的玻璃形成能力体系急剧下降，产生单斜晶系Bi 2 Te 4 O 11的抗玻璃相。通过高能 X 射线衍射、反向蒙特卡罗模拟和 Rietveld Fullprof 改进研究了玻璃和抗玻璃 Bi 2 Te 4 O 11样品的结构。由于存在至少三种长度的 Te-O 键：1.90、2.25 和 2.59 Å，除了各种 Bi-O 和 Nb-O 键长之外，所有玻璃都具有短程无序。由于 Te-Te 对距离的分布，玻璃中的中程有序也受到干扰。玻璃网络中的平均 Te-O 配位 ( N Te-O ) 随着 Bi 的增加而降低2 O 3和 Nb 2 O 5 mol%，范围为：4.17 至 3.56。抗玻璃Bi 2 Te 4 O 11的阳离子具有长程有序，但具有振动无序，呈现出尖锐的X射线反射，但具有与玻璃相似的宽振动带。抗玻璃 Bi 2 Te 4 O 11的N Te-O为 2.96，明显低于玻璃样品。
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