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(a) Powder XRD patterns of the precursor glasses with x(2BaO–0.5Na2O)–1P2O5–2.5Nb2O5 composition (x = 0.67–1) heat-treated at T p. ICDD data for BNN and NaNbO3 phases are also included. (b) Photograph of the heat-treated precursor glasses.
TEM images of the GC with x = 0.9 (a), 0.8 (b), and 0.67 (c), and their particle-size distributions in the glass-ceramics. Red curves were fitting results by log-normal function. d mean and d mode correspond to mean and mode diameters, respectively.
Variations of the dielectric constant and refractive index for precursor glasses and resulting GC as a function of x.
Absorption coefficient α as a function of wavelength for the precursor glass and GC with x = 0.67. Relation between (αE)1/2 as a function of E (E: photon energy) is also indicated (inset).
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