An overall trend of decreasing band widths was also reflected for the Ln 3+ -containing glasses relative to the Ba reference glass as seen in Table 4 .
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Impact of Lanthanide (Nd<sup>3+</sup>, Gd<sup>3+</sup>, and Yb<sup>3+</sup>) Ionic Field Strength on the Structure and Thermal Expansion of Phosphate Glasses.
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