Solution energy of (per mol of ) oxides in orthorhombic according to different incorporation mechanisms. Squares: reaction (3). Circles: reaction (4). Diamonds: reaction (5). Triangles: reaction (6). Solid lines correspond to least-squares fit of data with a second order polynomial.
Microstructure of ceramics. (a) Sample YB1, nominal composition , SEM, backscatter electron image, bar: . (b) Sample YB2, nominal composition , SEM, backscatter electron image bar: . (c) Sample YB2, nominal composition , OM, polarized light, after chemical etching, bar: . (d) Sample YB3, nominal composition , SEM, after thermal etching, bar: .
(a) XRD patterns ( radiation) of the different ceramics. The patterns correspond to orthorhombic , space group . Peaks not assigned to are indicated. (b) Results of Rietveld refinement for sample YB3.
Relative dielectric constant of ceramic YB1 with nominal composition .
Relative dielectric constant of ceramic YB2 with nominal composition .
Relative dielectric constant of ceramic YB3 with nominal composition .
Loss tangent of ceramic YB3 with nominal composition .
Interatomic potential parameters for orthorhombic .
Lattice parameters and lattice properties of orthorhombic . Experimental data are at room temperature.
Structural parameters of and ceramics as obtained from Rietveld refinement. The first row reports the nominal composition and the second raw the composition taken from the Rietveld refinements. Values in brackets represent the eds on the last decimal digit. Whenever they are not present, the parameter has not been refined in that sample.
Values of the parameters , , and (Barrett’s equation) for and ceramics at . is the Curie constant, is the Curie-Weiss temperature, and is the temperature of the crossover between classical and quantum behaviors.
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