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Masahiro Yoshimura - One of the best experts on this subject based on the ideXlab platform.

  • Luminescence of Phosphor Balls Prepared Using Melt Quenching Synthesis Method
    Materials Science Forum, 2017
    Co-Authors: Takuya Hasegawa, Kenji Toda, Shinnosuke Kamei, Tadashi Ishigaki, Kazuyoshi Uematsu, Mineo Sato, Sun Woog Kim, Masahiro Yoshimura
    Abstract:

    Well-grown M3MgSi2O8 (M = Ca, Sr and Ba):Eu2+ phosphors were synthesized by novel Melt Quenching synthesis method. The luminescence property of the Sr3MgSi2O8:Eu2+ phosphor synthesized by the Melt synthesis method is comparable to those of the sample synthesized by a conventional solid state reaction. Sintered phosphor balls with excellent luminescent characteristics were obtained.

  • y3al5o12 yag zro2 binary eutectic composites obtained by Melt Quenching
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004
    Co-Authors: Jose M Calderonmoreno, Masahiro Yoshimura
    Abstract:

    Abstract We report here the formation and eutectic architecture of Y3Al5O12–ZrO2 eutectic composites obtained using a rapid eutectic solidification method. The preparation of bulk pellets by rapid eutectic Quenching in the pseudo-binary system is presented. The phases present in the rapidly quenched composite, cubic yttria stabilized zirconia (YSZ), and yttrium aluminium garnet, Y3Al5O12(YAG), were determined by means of X-ray diffraction (XRD). Mutual substitution of yttria and zirconia in each phase was studied also by Raman spectroscopy. The eutectic morphology of the pseudo-binary eutectic was characterized by scanning electron microscopy (SEM). The eutectic composites showed a rod-like microstructure with eutectic spacings in the sub-micron range and could be obtained in a wide range of compositions along the Y3Al5O12–ZrO2 pseudobinary line of the Al2O3–Y2O3–ZrO2 ternary oxide diagram. Off-eutectic composites containing alumina or yttrium aluminium perovskite and showing a broken eutectic structure were also obtained.

  • effect of Melt Quenching on the subsolidus equilibria in the ternary system al2o3 y3al5o12 zro2
    Solid State Ionics, 2001
    Co-Authors: Jose M Calderonmoreno, Masahiro Yoshimura
    Abstract:

    Abstract We have studied the effect of Melt Quenching in the solidification behavior of ternary composites, for the Al2O3–Y3Al5O12 (YAG)–ZrO2 subsystem inside the ternary oxide system Al2O3–Y2O3–ZrO2. Ternary composites were prepared by Melting and rapid Quenching, in air, in an arc-image furnace. Solid phases were studied by XRD and Raman spectroscopy. Mutual substitution of the different cations in the solid phases is promoted by the rapid phase separation during Quenching. The Al2O3–YAG–ZrO2 subsolidus region in the ternary diagram was determined for arc-image rapidly solidified composites.

Jose M Calderonmoreno - One of the best experts on this subject based on the ideXlab platform.

  • y3al5o12 yag zro2 binary eutectic composites obtained by Melt Quenching
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004
    Co-Authors: Jose M Calderonmoreno, Masahiro Yoshimura
    Abstract:

    Abstract We report here the formation and eutectic architecture of Y3Al5O12–ZrO2 eutectic composites obtained using a rapid eutectic solidification method. The preparation of bulk pellets by rapid eutectic Quenching in the pseudo-binary system is presented. The phases present in the rapidly quenched composite, cubic yttria stabilized zirconia (YSZ), and yttrium aluminium garnet, Y3Al5O12(YAG), were determined by means of X-ray diffraction (XRD). Mutual substitution of yttria and zirconia in each phase was studied also by Raman spectroscopy. The eutectic morphology of the pseudo-binary eutectic was characterized by scanning electron microscopy (SEM). The eutectic composites showed a rod-like microstructure with eutectic spacings in the sub-micron range and could be obtained in a wide range of compositions along the Y3Al5O12–ZrO2 pseudobinary line of the Al2O3–Y2O3–ZrO2 ternary oxide diagram. Off-eutectic composites containing alumina or yttrium aluminium perovskite and showing a broken eutectic structure were also obtained.

  • effect of Melt Quenching on the subsolidus equilibria in the ternary system al2o3 y3al5o12 zro2
    Solid State Ionics, 2001
    Co-Authors: Jose M Calderonmoreno, Masahiro Yoshimura
    Abstract:

    Abstract We have studied the effect of Melt Quenching in the solidification behavior of ternary composites, for the Al2O3–Y3Al5O12 (YAG)–ZrO2 subsystem inside the ternary oxide system Al2O3–Y2O3–ZrO2. Ternary composites were prepared by Melting and rapid Quenching, in air, in an arc-image furnace. Solid phases were studied by XRD and Raman spectroscopy. Mutual substitution of the different cations in the solid phases is promoted by the rapid phase separation during Quenching. The Al2O3–YAG–ZrO2 subsolidus region in the ternary diagram was determined for arc-image rapidly solidified composites.

Eikichi Inukai - One of the best experts on this subject based on the ideXlab platform.

  • ag2o doped bi2sr2ca1cu2ox superconductors prepared via Melt Quenching
    Journal of the American Ceramic Society, 1993
    Co-Authors: Won-hyuk Lee, Yoshihiro Abe, Eikichi Inukai
    Abstract:

    Ag2O-doped superconducting Bi2Sr2Ca1Cu2Ox ceramics were prepared by a Melt-Quenching–reheating method. It is found that the Ag2O-doped, as-cast specimens exhibit superconductivity (Tc= around 80 K) by heat treatment at temperatures around 800°C even in an evacuated and sealed silica glass tube, while the undoped specimens do not and vaporize by the corresponding heat treatment. Conversion of the Ag2O-doped, as-cast specimens into superconducting ceramics when heated in an evacuated vessel is explained in terms of the oxygen donor of Ag2O in the specimen. This finding enables us to fabricate a desired shape of superconducting Bi2Sr2Ca1Cu2Ox ceramics sealed in metals or glasses. The addition of Ag2O to Bi2Sr2Ca1Cu2Ox Melt, however, had deleterious influences on the superconducting properties (Tc and Jc) of the resultant ceramics when obtained by heat treatment in air.

  • Ag2O‐Doped Bi2Sr2Ca1Cu2Ox Superconductors Prepared via Melt‐Quenching
    Journal of the American Ceramic Society, 1993
    Co-Authors: Won-hyuk Lee, Yoshihiro Abe, Eikichi Inukai
    Abstract:

    Ag2O-doped superconducting Bi2Sr2Ca1Cu2Ox ceramics were prepared by a Melt-Quenching–reheating method. It is found that the Ag2O-doped, as-cast specimens exhibit superconductivity (Tc= around 80 K) by heat treatment at temperatures around 800°C even in an evacuated and sealed silica glass tube, while the undoped specimens do not and vaporize by the corresponding heat treatment. Conversion of the Ag2O-doped, as-cast specimens into superconducting ceramics when heated in an evacuated vessel is explained in terms of the oxygen donor of Ag2O in the specimen. This finding enables us to fabricate a desired shape of superconducting Bi2Sr2Ca1Cu2Ox ceramics sealed in metals or glasses. The addition of Ag2O to Bi2Sr2Ca1Cu2Ox Melt, however, had deleterious influences on the superconducting properties (Tc and Jc) of the resultant ceramics when obtained by heat treatment in air.

Ferhunde Atay - One of the best experts on this subject based on the ideXlab platform.

  • characterization of chemically sprayed cdo films on borate and phosphate glass substrates produced by Melt Quenching technique
    Materials Chemistry and Physics, 2013
    Co-Authors: Cetinkaya S Colak, Baris Erdogan, I Akyuz, Ferhunde Atay
    Abstract:

    Abstract The properties of substrates used to deposit thin films are an important parameter in thin film production. Instead of using a commercial substrate, in this work, borate and phosphate glasses have been obtained by classic Melt-Quenching technique to be used as substrates for CdO films. Also, a microscope glass substrate has been used to compare the coating properties by other glass substrates. All films have been produced by Ultrasonic Spray Pyrolysis technique. The substrate temperature has been selected as 275 ± 5 °C. Thicknesses and some optical parameters such as refractive index and extinction coefficient have been determined by spectroscopic ellipsometry. Absorbance and transmittance spectra have been taken by UV/VIS spectrophotometer. Four-probe method has been used to determine the electrical resistivity values of the films. XRD investigations have shown that type of the substrate dramatically affects the characteristics of CdO films. CdO film deposited on phosphate glass substrate has the best structural quality. Atomic Force Microscope has been used to investigate the surface properties and roughness values of the films.

M Wasiucionek - One of the best experts on this subject based on the ideXlab platform.

  • properties of 15ag2o 70v2o5 15p2o5 glass prepared by Melt Quenching twin rollers and mechanosynthesis method
    Solid State Ionics, 2015
    Co-Authors: Anna S Kalbarczyk, J L Nowinski, M Wasiucionek, Jakub Kalabinski, Wioleta ślubowska, J E Garbarczyk
    Abstract:

    Abstract Three different methods – Melt Quenching (MQ), twin rollers (TR) and mechanosynthesis (MS) – were used for the preparation of the 15Ag2O·70V2O5∙ 15P2O5 glass — a good amorphous semiconductor. It was demonstrated that physical properties of the final material depend to some extent on the preparation method. As-received samples were characterized by: X-ray diffractometry (XRD), differential scanning calorimetry (DSC), Raman scattering, X-PDF method and impedance spectroscopy (IS) in a wide temperature range from − 80 to 230 °C. Main conclusion of these studies is, that substantially different synthesis routes can be used to produce glasses of almost identical thermal and structural properties but different electronic conductivity. The explanation of the origin of that difference was proposed and discussed.

  • characterisation of silver vanadate glasses prepared by Melt Quenching twin rollers and mechanosynthesis methods
    Solid State Ionics, 2011
    Co-Authors: A Czajkowska, J L Nowinski, M Mroczkowska, J E Garbarczyk, M Wasiucionek
    Abstract:

    Abstract Three different methods - Melt Quenching, twin rollers and mechanosynthesis - were used for preparation of the 50AgI·30Ag 2 O·20V 2 O 5 glass – a good amorphous superionic conductor. It was demonstrated that physical properties of the final amorphous material depend to some extent on the preparation method. As-received samples were characterized by: X-ray diffractometry (XRD), differential scanning calorimetry (DSC), infrared absorption (FTIR), Raman scattering and impedance spectroscopy (IS) in a wide temperature range from -150 to 20 °C. Main conclusion of the results of these studies is that substantially different synthetic routes can be used to produce amorphous materials of very similar but not identical properties.