TY - JOUR
T1 - Part 1. 125Te NMR study of tellurite crystals
AU - Sakida, Shinichi
AU - Hayakawa, Satoshi
AU - Yoko, Toshinobu
N1 - Funding Information:
The authors thank Professor F. Horii, Mrs K. Omine and Dr H. Kaji of Kyoto University for their helpful advice and assistance in the NMR measurements. One of the authors (T.Y.) also acknowledges a grant by the Asahi Glass Foundation.
PY - 1999
Y1 - 1999
N2 - 125Te static and magic-angle spinning (MAS) NMR spectra of tellurite crystals with known crystal structures have been measured to determine the isotropic chemical shift δiso, the chemical shift anisotropy Δδ and the asymmetry parameter η. On the basis of structural unit, tellurite crystals are classified for convenience into TeO3 type (isolated TeO3 and terminal TeO3 type), TeO3+1 type and TeO4 type (α-TeO2 and β-TeO2 type). As a result, the following relations were found: TeO3 ≥ TeO3+1 ≈ β-TeO2 > α-TeO2 in δiso(MAS), β-TeO2 ≥ α-TeO2 > TeO3+1 > terminal TeO3 ≥ isolated TeO3 in |Δδ| and TeO4 ≥ TeO3+1 ≥ TeO3 in η. It was also found that the combination of |Δδ| and η, namely, the relative values of δ1, δ2 and δ3, can elucidate the local structure around Te atoms more definitely than δiso. This diagram is useful for examining the structures of tellurite crystals and glasses. (Glasses are discussed in another paper.)
AB - 125Te static and magic-angle spinning (MAS) NMR spectra of tellurite crystals with known crystal structures have been measured to determine the isotropic chemical shift δiso, the chemical shift anisotropy Δδ and the asymmetry parameter η. On the basis of structural unit, tellurite crystals are classified for convenience into TeO3 type (isolated TeO3 and terminal TeO3 type), TeO3+1 type and TeO4 type (α-TeO2 and β-TeO2 type). As a result, the following relations were found: TeO3 ≥ TeO3+1 ≈ β-TeO2 > α-TeO2 in δiso(MAS), β-TeO2 ≥ α-TeO2 > TeO3+1 > terminal TeO3 ≥ isolated TeO3 in |Δδ| and TeO4 ≥ TeO3+1 ≥ TeO3 in η. It was also found that the combination of |Δδ| and η, namely, the relative values of δ1, δ2 and δ3, can elucidate the local structure around Te atoms more definitely than δiso. This diagram is useful for examining the structures of tellurite crystals and glasses. (Glasses are discussed in another paper.)
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U2 - 10.1016/S0022-3093(98)00811-4
DO - 10.1016/S0022-3093(98)00811-4
M3 - Article
AN - SCOPUS:0032804884
SN - 0022-3093
VL - 243
SP - 1
EP - 12
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 1
ER -