125Te NMR chemical shifts and tellurium coordination environments in crystals and glasses in the Ge–As–Sb–Te system

As2Te3 glass under high hydrostatic pressure: Polyamorphism, relaxation, and metallization

“…Of particular interest are the As x Te 100−x glasses that serve as model systems, but an atomistic understanding of the structure−property relations in it remains obscure due to controversies [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The As 2 Te 3 melt, similar to the Te melt, is a metal at small overheating above the melting temperature [16,17], as a result, cooling-induced crystallization can be avoided only at quenching rates above 100 K/s.…”

“…However, it was established more recently that stoichiometric glassy g-As 2 Te 3 strongly differs in structure of the short-range order from the crystalline phase and is characterized by a chemical disorder of 30 to 60% (chemical disorder is defined as the number of homopolar As-As bonds to the total number of As-Te and As-As bonds) [3][4][5][6][7][8][9][10][11][12]. Furthermore, the analysis of the structure of g-As 2 Te 3 is also complicated because of a strong dependence on the fabrication procedure [8,15].…”

X-ray photoelectron spectra of Ge-As-Te glasses

“…15 Generally, the binding energy positions of Te core level would shift towards a high-energetic direction due to the increase of the local coordination number. However, negligible change of the binding energy of Te indicates that, there is no significant change of the chemical coordination of Te in the compositional range of the present investigation.…”

“…11 The addition of Ge into glass network can promote the glass transition due to the well-known fact that the substitution of three-coordinated As and two-coordinated Te by four-coordinated Ge can enhance the glass network connectivity. [12][13][14] On the other hand, there is an argument that chemical coordination of Te could vary from 2 in Te-rich and chemically stoichiometric glasses to 3 in Te-poor glasses, [15][16][17] but solid evidence is still scare. Therefore in the present paper, we prepared 7 pieces of Ge 10 As x Te 90-x glasses and investigated the evolution of the structure with changing chemical compositions using high resolution x-ray photoelectron spectroscopy (XPS).…”

Structure of chalcogenide glasses characterized by nuclear magnetic resonance (NMR) spectroscopy

“…Thus, various glass systems have already been investigated by 77 Se such as as x Se 1-x [18][19][20][21][22][23], Ge x Se 1-x [24][25][26][27][28][29] or Te x Se 1-x [30], giving crucial information on the connectivity between Se atoms. In addition, some pioneers and preliminary studies have opened the way to the study of more unusual and tricky nuclei: 75 as [31][32][33], 125 Te [30,34] and 73 Ge [35].…”