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Dielectric and Structural Studies of Ba<sub>2</sub>ReNb<sub>3</sub>Ti<sub>2</sub>O<sub>15</sub> (BReNTO<sub>15</sub>,Re=Bi<sup>3+</sup>,La<sup>3+</sup>,Nd<sup>3+</sup>,Sm<sup>3+</sup>,Gd<sup>3+</sup>) Tetragonal Tungsten Bronze Structured Ceramics: Page feedback