The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform

Alain Billard - One of the best experts on this subject based on the ideXlab platform.

  • Electrical and structural investigation of Perovskite Structure reactively sputter deposited coatings
    Solid State Ionics, 2009
    Co-Authors: M. Arab Pour Yazdi, Pascal Briois, Samuel Georges, Alain Billard
    Abstract:

    Sr(Zr0.84Y0.16)0.91O3 − δ (SZY) and Ba(Zr0.84Y0.16)0.96O3 − δ (BZY) protonic conductor coatings were co-sputter deposited from metallic targets in argon–oxygen reactive gas mixtures. The chemical and structural features were investigated by energy dispersive X-ray spectroscopy and X-ray diffraction, and their morphology was assessed by scanning electron microscopy of the surface and of brittle fracture cross sections. The electrical properties of the coating were determined by complex impedance spectroscopy as a function of temperature in air. Relationships are established between the electrical properties and the morphology of the coatings. The SZY as deposited coatings is amorphous and crystallises under the convenient Perovskite Structure after annealing treatment at 873 K under air. The BZY as deposited coatings is crystallised at 523 K in situ under Perovskite Structure and a further annealing treatment increases the grain size. Conductivities and activation energies of crystallised coatings were 3.1 · 10− 5 S cm− 1/2 · 10− 5 S cm− 1 and 0.65 eV/0.71 eV after stabilization at 773 K for strontium and barium zirconate, respectively.

  • Electrical and structural investigations of Perovskite Structure reactively sputter deposited coatings
    Solid State Ionics, 2009
    Co-Authors: M. Arab Pour Yazdi, Pascal Briois, Samuel Georges, Alain Billard
    Abstract:

    International audienceSr(Zr0.84Y0.16)0.91O3 − δ (SZY) and Ba(Zr0.84Y0.16)0.96O3 − δ (BZY) protonic conductor coatings were co-sputter deposited from metallic targets in argon–oxygen reactive gas mixtures. The chemical and structural features were investigated by energy dispersive X-ray spectroscopy and X-ray diffraction, and their morphology was assessed by scanning electron microscopy of the surface and of brittle fracture cross sections. The electrical properties of the coating were determined by complex impedance spectroscopy as a function of temperature in air. Relationships are established between the electrical properties and the morphology of the coatings. The SZY as deposited coatings is amorphous and crystallises under the convenient Perovskite Structure after annealing treatment at 873 K under air. The BZY as deposited coatings is crystallised at 523 K in situ under Perovskite Structure and a further annealing treatment increases the grain size. Conductivities and activation energies of crystallised coatings were 3.1 · 10− 5 S cm− 1/2 · 10− 5 S cm− 1 and 0.65 eV/0.71 eV after stabilization at 773 K for strontium and barium zirconate, respectively

M. Arab Pour Yazdi - One of the best experts on this subject based on the ideXlab platform.

  • Electrical and structural investigation of Perovskite Structure reactively sputter deposited coatings
    Solid State Ionics, 2009
    Co-Authors: M. Arab Pour Yazdi, Pascal Briois, Samuel Georges, Alain Billard
    Abstract:

    Sr(Zr0.84Y0.16)0.91O3 − δ (SZY) and Ba(Zr0.84Y0.16)0.96O3 − δ (BZY) protonic conductor coatings were co-sputter deposited from metallic targets in argon–oxygen reactive gas mixtures. The chemical and structural features were investigated by energy dispersive X-ray spectroscopy and X-ray diffraction, and their morphology was assessed by scanning electron microscopy of the surface and of brittle fracture cross sections. The electrical properties of the coating were determined by complex impedance spectroscopy as a function of temperature in air. Relationships are established between the electrical properties and the morphology of the coatings. The SZY as deposited coatings is amorphous and crystallises under the convenient Perovskite Structure after annealing treatment at 873 K under air. The BZY as deposited coatings is crystallised at 523 K in situ under Perovskite Structure and a further annealing treatment increases the grain size. Conductivities and activation energies of crystallised coatings were 3.1 · 10− 5 S cm− 1/2 · 10− 5 S cm− 1 and 0.65 eV/0.71 eV after stabilization at 773 K for strontium and barium zirconate, respectively.

  • Electrical and structural investigations of Perovskite Structure reactively sputter deposited coatings
    Solid State Ionics, 2009
    Co-Authors: M. Arab Pour Yazdi, Pascal Briois, Samuel Georges, Alain Billard
    Abstract:

    International audienceSr(Zr0.84Y0.16)0.91O3 − δ (SZY) and Ba(Zr0.84Y0.16)0.96O3 − δ (BZY) protonic conductor coatings were co-sputter deposited from metallic targets in argon–oxygen reactive gas mixtures. The chemical and structural features were investigated by energy dispersive X-ray spectroscopy and X-ray diffraction, and their morphology was assessed by scanning electron microscopy of the surface and of brittle fracture cross sections. The electrical properties of the coating were determined by complex impedance spectroscopy as a function of temperature in air. Relationships are established between the electrical properties and the morphology of the coatings. The SZY as deposited coatings is amorphous and crystallises under the convenient Perovskite Structure after annealing treatment at 873 K under air. The BZY as deposited coatings is crystallised at 523 K in situ under Perovskite Structure and a further annealing treatment increases the grain size. Conductivities and activation energies of crystallised coatings were 3.1 · 10− 5 S cm− 1/2 · 10− 5 S cm− 1 and 0.65 eV/0.71 eV after stabilization at 773 K for strontium and barium zirconate, respectively

Samuel Georges - One of the best experts on this subject based on the ideXlab platform.

  • Electrical and structural investigation of Perovskite Structure reactively sputter deposited coatings
    Solid State Ionics, 2009
    Co-Authors: M. Arab Pour Yazdi, Pascal Briois, Samuel Georges, Alain Billard
    Abstract:

    Sr(Zr0.84Y0.16)0.91O3 − δ (SZY) and Ba(Zr0.84Y0.16)0.96O3 − δ (BZY) protonic conductor coatings were co-sputter deposited from metallic targets in argon–oxygen reactive gas mixtures. The chemical and structural features were investigated by energy dispersive X-ray spectroscopy and X-ray diffraction, and their morphology was assessed by scanning electron microscopy of the surface and of brittle fracture cross sections. The electrical properties of the coating were determined by complex impedance spectroscopy as a function of temperature in air. Relationships are established between the electrical properties and the morphology of the coatings. The SZY as deposited coatings is amorphous and crystallises under the convenient Perovskite Structure after annealing treatment at 873 K under air. The BZY as deposited coatings is crystallised at 523 K in situ under Perovskite Structure and a further annealing treatment increases the grain size. Conductivities and activation energies of crystallised coatings were 3.1 · 10− 5 S cm− 1/2 · 10− 5 S cm− 1 and 0.65 eV/0.71 eV after stabilization at 773 K for strontium and barium zirconate, respectively.

  • Electrical and structural investigations of Perovskite Structure reactively sputter deposited coatings
    Solid State Ionics, 2009
    Co-Authors: M. Arab Pour Yazdi, Pascal Briois, Samuel Georges, Alain Billard
    Abstract:

    International audienceSr(Zr0.84Y0.16)0.91O3 − δ (SZY) and Ba(Zr0.84Y0.16)0.96O3 − δ (BZY) protonic conductor coatings were co-sputter deposited from metallic targets in argon–oxygen reactive gas mixtures. The chemical and structural features were investigated by energy dispersive X-ray spectroscopy and X-ray diffraction, and their morphology was assessed by scanning electron microscopy of the surface and of brittle fracture cross sections. The electrical properties of the coating were determined by complex impedance spectroscopy as a function of temperature in air. Relationships are established between the electrical properties and the morphology of the coatings. The SZY as deposited coatings is amorphous and crystallises under the convenient Perovskite Structure after annealing treatment at 873 K under air. The BZY as deposited coatings is crystallised at 523 K in situ under Perovskite Structure and a further annealing treatment increases the grain size. Conductivities and activation energies of crystallised coatings were 3.1 · 10− 5 S cm− 1/2 · 10− 5 S cm− 1 and 0.65 eV/0.71 eV after stabilization at 773 K for strontium and barium zirconate, respectively

Pascal Briois - One of the best experts on this subject based on the ideXlab platform.

  • Electrical and structural investigation of Perovskite Structure reactively sputter deposited coatings
    Solid State Ionics, 2009
    Co-Authors: M. Arab Pour Yazdi, Pascal Briois, Samuel Georges, Alain Billard
    Abstract:

    Sr(Zr0.84Y0.16)0.91O3 − δ (SZY) and Ba(Zr0.84Y0.16)0.96O3 − δ (BZY) protonic conductor coatings were co-sputter deposited from metallic targets in argon–oxygen reactive gas mixtures. The chemical and structural features were investigated by energy dispersive X-ray spectroscopy and X-ray diffraction, and their morphology was assessed by scanning electron microscopy of the surface and of brittle fracture cross sections. The electrical properties of the coating were determined by complex impedance spectroscopy as a function of temperature in air. Relationships are established between the electrical properties and the morphology of the coatings. The SZY as deposited coatings is amorphous and crystallises under the convenient Perovskite Structure after annealing treatment at 873 K under air. The BZY as deposited coatings is crystallised at 523 K in situ under Perovskite Structure and a further annealing treatment increases the grain size. Conductivities and activation energies of crystallised coatings were 3.1 · 10− 5 S cm− 1/2 · 10− 5 S cm− 1 and 0.65 eV/0.71 eV after stabilization at 773 K for strontium and barium zirconate, respectively.

  • Electrical and structural investigations of Perovskite Structure reactively sputter deposited coatings
    Solid State Ionics, 2009
    Co-Authors: M. Arab Pour Yazdi, Pascal Briois, Samuel Georges, Alain Billard
    Abstract:

    International audienceSr(Zr0.84Y0.16)0.91O3 − δ (SZY) and Ba(Zr0.84Y0.16)0.96O3 − δ (BZY) protonic conductor coatings were co-sputter deposited from metallic targets in argon–oxygen reactive gas mixtures. The chemical and structural features were investigated by energy dispersive X-ray spectroscopy and X-ray diffraction, and their morphology was assessed by scanning electron microscopy of the surface and of brittle fracture cross sections. The electrical properties of the coating were determined by complex impedance spectroscopy as a function of temperature in air. Relationships are established between the electrical properties and the morphology of the coatings. The SZY as deposited coatings is amorphous and crystallises under the convenient Perovskite Structure after annealing treatment at 873 K under air. The BZY as deposited coatings is crystallised at 523 K in situ under Perovskite Structure and a further annealing treatment increases the grain size. Conductivities and activation energies of crystallised coatings were 3.1 · 10− 5 S cm− 1/2 · 10− 5 S cm− 1 and 0.65 eV/0.71 eV after stabilization at 773 K for strontium and barium zirconate, respectively

Yuichi Shimakawa - One of the best experts on this subject based on the ideXlab platform.

  • Pressure Effect on Intersite Charge Transfer in A-site-Ordered Double-Perovskite-Structure Oxide
    Chemistry of Materials, 2012
    Co-Authors: Youwen Long, Takashi Saito, Takateru Kawakami, Wei-tin Chen, Tetsu Watanuki, Yuta Nakakura, Qingqing Liu, Changqing Jin, Yuichi Shimakawa
    Abstract:

    The intersite charge transfer at room temperature was found to occur by applying pressure in the A-site-ordered double-Perovskite-Structure oxide LaCu3Fe4O12. The pressure-induced charge transfer b...

  • A-site magnetism in A-site-ordered Perovskite-Structure oxides
    physica status solidi (b), 2011
    Co-Authors: Yuichi Shimakawa, Takashi Saito
    Abstract:

    A-site-ordered Perovskite-Structure oxides AA′3B4O12 with Cu2+ ions at the A′ site are highlighted. Some new compounds were synthesized under high-pressure and high-temperature conditions. With nonmagnetic ions at the B site, only the Cu2+ spins at the A′ site contribute to the magnetic properties, providing an intriguing magnetism system that has a cubic S = 1/2 spin sublattice. When the A-site ion is nonmagnetic, either ferromagnetism (CaCu3Ge4O12 and CaCu3Sn4O12) or antiferromagnetism (CaCu3Ti4O12) of Cu2+ spins arises. The ferromagnetic Cu–Cu direct-exchange interaction and the antiferromagnetic Cu–O–Ti–O–Cu superexchange interaction are mutually competitive, and a perfect balance of the interactions in a solid-solution sample causes unusual instability resulting in a magnetic tri-critical point. Introducing magnetic lanthanide (Ln) ions into the A site was expected to produce A–A′ magnetic interaction, and in both the antiferromagnetic (Ln2/3Cu3Ti4O12) and ferromagnetic [LnCu3(Ge3/4Ga1/4)4O12] compounds the A′-site Cu2+ spins are ordered but the magnetic interactions between the A- and A′-site magnetic sublattices are very weak. Ferromagnetic (left) and antiferromagnetic (right) spin Structures of A-site-ordered Perovskite-Structure oxides, AA′3B4O12.