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High Permittivity and Low Loss Dielectric Ceramics Ba5LnNiNb9O30 (Ln: La, Nd and Sm). -The new title ceramics are synthesized from stoichiometric mixtures of BaCO3, Ln2O3 (Ln: La, Nd, Sm), Ni2O3, and N2O5 (1350-1380°C, 6 h). The samples are characterized by XRD, SEM, and dielectric measurements. All three compounds are paraelectric phases. At 1 MHz, the ceramics have high dielectric constants in the range 193-245.3, a low dielectric loss in the range 0.0059-0.0087, and the temperature coefficients of the dielectric constants are in the range from -1140 to -1310 ppm/°C. These materials might have potential applications in temperature-compensating capacitors. The key issue of these ceramics is to lower the dielectric loss further and to reduce the temperature coefficient of the dielectric constant in microwave applications. -(FANG, L.; MENG, S. S.; HU, C.

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