We present measurements of the magnetic field dependent microwave surface resistance in laser-ablated YBa2Cu3O7−δ films on SrTiO3 substrates. BaZrO3 crystallites were included in the films using composite targets containing BaZrO3 inclusions with mean grain size smaller than 1 μm. X-ray diffraction showed single epitaxial relationship between BaZrO3 and YBa2Cu3O7−δ. The effective surface resist...

In this study, BaZrO3:Eu0.025 powder was synthesized through the solid-state reaction method with two different heating processes. For the one-step process, the BaZrO3:Eu0.025 powder was heated to 1000 ̋C–1400 ̋C for 2 h. For the two-step heating process, the BaZrO3:Eu0.025 powder was pre-heated at 800 ̋C for 2 h, after being cooled to room temperature and ground, then the powder was heated to ...

We use first-principles density functional theory calculations to investigate the dielectric response of BaZrO3 perovskite. A previous study [Arkbarzadeh et al. Phys. Rev. B 72, 205104 (2005)] reported a disagreement between experimental and theoretical low temperature dielectric constant ǫ for the high symmetry BaZrO3 structure. We show that a fully relaxed 40-atom BaZrO3 structure exhibits O6...

The atomic structure and charge redistribution of different terminations of BaZrO3 011 surfaces have been studied using density functional simulations. We found that the O-terminated 011 flat surface had the smallest cleavage energy among 011 surfaces, but this value was still twice as large as for the formation of a pair of complimentary 001 surfaces. The density functional calculations allowe...

We use first-principles density functional theory calculations to investigate the dielectric response of BaZrO3 perovskite. A previous study Akbarzadeh et al., Phys. Rev. B 72, 205104 2005 reported a disagreement between experimental and theoretical low temperature dielectric constant for the high symmetry BaZrO3 structure. We show that a fully relaxed 40 atom BaZrO3 structure exhibits O6 octah...

We probe the short-range pinning properties with the application of microwave currents at very high driving frequencies (47.7 GHz) on YBa2Cu3O7−δ films with and without sub-micrometer BaZrO3 inclusions. We explore the temperature and field ranges 60 K< T < Tc and 0< μ0H <0.8 T, with the field applied along the c-axis. The magnetic field induces a much smaller increase of the microwave resistivi...

We use first-principles density functional theory calculations to investigate the ground-state structure of sulfide perovskite BaZrS3. The material has a lower band gap than its oxide analog BaZrO3. Neither are ferroelectric in the ground state at T=0 K. We also examine the IR-active phonon contributions to the dielectric constant of BaZrS3, which are then compared to those of BaZrO3. The roles...

In this project electrical and optical properties of BaZrO3 have been accomplished through the full-potential linear augmented plane wave (FP-LAPW) by applying Wein2k software. In this study band structure, density of state, gap energy, refractive index and optical conduction have been studied. The results of calculations show that BaZrO3 is an insulator with an indirect gap in which 3.2 ev and...

A perovskite-structured barium zirconate, BaZrO3 (BZ), support is demonstrated to enhance the activity, relative to γ-Al2O3, of Co nanoparticle catalysts decorated with Pt for CO2 methanation. The CO2 methanation reaction may play a central role in both CO2 utilization and energy storage strategies for renewable energy. These catalysts require cooperative hydrogen transport between the supporte...

Small substitutions of BaZrO3 into Ba[(Zn,Ni)1/3Ta2/3]O3 are utilized in the commercial preparation of low-loss perovskite microwave dielectrics. The structures of a series of these phases with substitution levels ranging from 1% to 5% BaZrO3 were examined using high-resolution TEM. For ≤ 2.15% BaZrO3 the solid solutions retain the ordered ‘‘1:2’’ structure of the Ba[(Zn,Ni)1/3Ta2/3]O3 end-memb...