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Manipulation of polar order in the “empty” tetragonal tungsten bronzes: Ba4 xSrxDy0 671 33Nb10O30, x = 0, 0 25, 0 5, 1, 2, 3

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Table I – Lattice parameters, unit cell volume, tetragonality (c/a)†, A1B2O3 tolerance factors (tA1)‡ obtained from PXRD data and TCa or Tmb values (at 1 MHz) determined dielectric data for Ba4-xSrxDy0.67Nb10O30
Figure 1. Relative permittivity, ε’, and dielectric loss, tan δ, data (at 1 MHz) as a function of temperature for Ba4-xSrxDy0.67Nb10O30 (x = 0, 0.25, 0.5, 1, 2, 3)
Figure 2. Relative permittivity data for Ba4-xSrxDy0.67Nb10O30, (a) x  = 1,  (b) x = 2, (c) x = 3 at selected frequencies and (d) Vogel-Fulcher fits for x = 2 and 3 including goodness-of-fit parameters (root mean square standard deviation and χ2)
Figure 3. Polarisation-electric field (P-E) loops and associated current-field (I-E) responses for: (a) x = 0.25 demonstrating ‘normal’ ferroelectric switching, (b) x = 0.25 with asymmetric P-E loop; P-E and I-E data for x = 3 showing ferroelectric switchi

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