Low-temperature synthesis of T′-La2CuO4 using CaH2 as reductant

T. Takamatsu; M. Kato; T. Noji; Y. Koike

doi:10.1016/j.physc.2011.05.025

Low-temperature synthesis of T′-La₂CuO₄ using CaH₂ as reductant

T. Takamatsu, M. Kato, T. Noji, Y. Koike

ENG - Applied Physics

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

We have successfully synthesized polycrystalline bulk samples of La ₂CuO₄ with the Nd₂CuO₄-type (T′) structure at low temperatures. First of all, La₂CuO ₄ with the K₂NiF₄-type (T) structure was prepared by the conventional solid-state reaction. Secondly, La ₂CuO_3.5+δ with the Sr₂CuO ₃-type structure was obtained by heating mixed powder of T-La ₂CuO₄ and CaH₂ at 175 °C in an evacuated Pyrex tube. Thirdly, T′-La₂CuO_4+δ was prepared by heating La₂CuO_3.5+δ at 250 °C in air. Finally, T′-La₂CuO₄₊ _δ was reduced using CaH₂ to remove excess oxygen. The powder X-ray diffraction pattern has revealed that the product is of the single phase of T′-La₂CuO₄, but no superconductivity has been observed at T > 2 K in the magnetic susceptibility measurement. The residual excess oxygen may suppress the appearance of superconductivity.

Original language	English
Pages (from-to)	679-681
Number of pages	3
Journal	Physica C: Superconductivity and its applications
Volume	471
Issue number	21-22
DOIs	https://doi.org/10.1016/j.physc.2011.05.025
Publication status	Published - 2011 Nov

Keywords

CaH
Low-temperature synthesis
T′-LaCuO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2011.05.025

Cite this

@article{4c245176ea8c494bb003241628677e2c,

title = "Low-temperature synthesis of T′-La2CuO4 using CaH2 as reductant",

abstract = "We have successfully synthesized polycrystalline bulk samples of La 2CuO4 with the Nd2CuO4-type (T′) structure at low temperatures. First of all, La2CuO 4 with the K2NiF4-type (T) structure was prepared by the conventional solid-state reaction. Secondly, La 2CuO3.5+δ with the Sr2CuO 3-type structure was obtained by heating mixed powder of T-La 2CuO4 and CaH2 at 175 °C in an evacuated Pyrex tube. Thirdly, T′-La2CuO4+δ was prepared by heating La2CuO3.5+δ at 250 °C in air. Finally, T′-La2CuO4+ δ was reduced using CaH2 to remove excess oxygen. The powder X-ray diffraction pattern has revealed that the product is of the single phase of T′-La2CuO4, but no superconductivity has been observed at T > 2 K in the magnetic susceptibility measurement. The residual excess oxygen may suppress the appearance of superconductivity.",

keywords = "CaH, Low-temperature synthesis, T′-LaCuO",

author = "T. Takamatsu and M. Kato and T. Noji and Y. Koike",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science and also by the Global COE Program “Materials Integration (International Center of Education and Research), Tohoku University,” MEXT, Japan.",

year = "2011",

month = nov,

doi = "10.1016/j.physc.2011.05.025",

language = "English",

volume = "471",

pages = "679--681",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "21-22",

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TY - JOUR

T1 - Low-temperature synthesis of T′-La2CuO4 using CaH2 as reductant

AU - Takamatsu, T.

AU - Kato, M.

AU - Noji, T.

AU - Koike, Y.

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science and also by the Global COE Program “Materials Integration (International Center of Education and Research), Tohoku University,” MEXT, Japan.

PY - 2011/11

Y1 - 2011/11

N2 - We have successfully synthesized polycrystalline bulk samples of La 2CuO4 with the Nd2CuO4-type (T′) structure at low temperatures. First of all, La2CuO 4 with the K2NiF4-type (T) structure was prepared by the conventional solid-state reaction. Secondly, La 2CuO3.5+δ with the Sr2CuO 3-type structure was obtained by heating mixed powder of T-La 2CuO4 and CaH2 at 175 °C in an evacuated Pyrex tube. Thirdly, T′-La2CuO4+δ was prepared by heating La2CuO3.5+δ at 250 °C in air. Finally, T′-La2CuO4+ δ was reduced using CaH2 to remove excess oxygen. The powder X-ray diffraction pattern has revealed that the product is of the single phase of T′-La2CuO4, but no superconductivity has been observed at T > 2 K in the magnetic susceptibility measurement. The residual excess oxygen may suppress the appearance of superconductivity.

AB - We have successfully synthesized polycrystalline bulk samples of La 2CuO4 with the Nd2CuO4-type (T′) structure at low temperatures. First of all, La2CuO 4 with the K2NiF4-type (T) structure was prepared by the conventional solid-state reaction. Secondly, La 2CuO3.5+δ with the Sr2CuO 3-type structure was obtained by heating mixed powder of T-La 2CuO4 and CaH2 at 175 °C in an evacuated Pyrex tube. Thirdly, T′-La2CuO4+δ was prepared by heating La2CuO3.5+δ at 250 °C in air. Finally, T′-La2CuO4+ δ was reduced using CaH2 to remove excess oxygen. The powder X-ray diffraction pattern has revealed that the product is of the single phase of T′-La2CuO4, but no superconductivity has been observed at T > 2 K in the magnetic susceptibility measurement. The residual excess oxygen may suppress the appearance of superconductivity.

KW - CaH

KW - Low-temperature synthesis

KW - T′-LaCuO

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