Preparation ofα-MnO2with an Open Tunnel

Yuji Muraoka; Hiroshi Chiba; Toshiyuki Atou; Masae Kikuchi; Kenji Hiraga; Yasuhiko Syono; Shoko Sugiyama; Sadaaki Yamamoto; Jean Claude Grenier

doi:10.1006/jssc.1999.8133

Preparation ofα-MnO₂with an Open Tunnel

Yuji Muraoka, Hiroshi Chiba, Toshiyuki Atou, Masae Kikuchi, Kenji Hiraga, Yasuhiko Syono, Shoko Sugiyama, Sadaaki Yamamoto, Jean Claude Grenier

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

56 Citations (Scopus)

Abstract

A single-phaseα-MnO₂without any large stabilizing cations was successfully prepared by starting from hollandite-type (NH₄)_xMn₈O₁₆and quenching from 440°C during heating in flowing Ar. The unit-cell dimension was determined by XRD analysis to bea=10.308(2) Å andc=2.854(1) Å. In comparison with that of the starting material (a=9.896(1) Å andc= 2.859(1) Å), theadimension increased while thecdimension changed little. No presence of ammonium ions in the structure of this specimen was shown by IR spectroscopy, the Kjeldahl analysis, or temperature-programmed-desorption (TPD) measurement. The structural change from the hollandite phase to Mn₂O₃was observed at 540°C. TPD analysis indicates the presence of nitrogen other than ammonium ions in the hollandite material we prepared, and also suggests that this nitrogen might have a strong chemical interaction to the hollandite structure.

Original language	English
Pages (from-to)	136-142
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	144
Issue number	1
DOIs	https://doi.org/10.1006/jssc.1999.8133
Publication status	Published - Apr 1 1999
Externally published	Yes

Keywords

440°C
ammonium ion
hollandite structure
quench
α-MnO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1006/jssc.1999.8133

Cite this

@article{e9b2ce7f32b84ea9adba2c45a8bb787c,

title = "Preparation ofα-MnO2with an Open Tunnel",

abstract = "A single-phaseα-MnO2without any large stabilizing cations was successfully prepared by starting from hollandite-type (NH4)xMn8O16and quenching from 440°C during heating in flowing Ar. The unit-cell dimension was determined by XRD analysis to bea=10.308(2) {\AA} andc=2.854(1) {\AA}. In comparison with that of the starting material (a=9.896(1) {\AA} andc= 2.859(1) {\AA}), theadimension increased while thecdimension changed little. No presence of ammonium ions in the structure of this specimen was shown by IR spectroscopy, the Kjeldahl analysis, or temperature-programmed-desorption (TPD) measurement. The structural change from the hollandite phase to Mn2O3was observed at 540°C. TPD analysis indicates the presence of nitrogen other than ammonium ions in the hollandite material we prepared, and also suggests that this nitrogen might have a strong chemical interaction to the hollandite structure.",

keywords = "440°C, ammonium ion, hollandite structure, quench, α-MnO",

author = "Yuji Muraoka and Hiroshi Chiba and Toshiyuki Atou and Masae Kikuchi and Kenji Hiraga and Yasuhiko Syono and Shoko Sugiyama and Sadaaki Yamamoto and Grenier, {Jean Claude}",

year = "1999",

month = apr,

day = "1",

doi = "10.1006/jssc.1999.8133",

language = "English",

volume = "144",

pages = "136--142",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "1",

}

TY - JOUR

T1 - Preparation ofα-MnO2with an Open Tunnel

AU - Muraoka, Yuji

AU - Chiba, Hiroshi

AU - Atou, Toshiyuki

AU - Kikuchi, Masae

AU - Hiraga, Kenji

AU - Syono, Yasuhiko

AU - Sugiyama, Shoko

AU - Yamamoto, Sadaaki

AU - Grenier, Jean Claude

PY - 1999/4/1

Y1 - 1999/4/1

N2 - A single-phaseα-MnO2without any large stabilizing cations was successfully prepared by starting from hollandite-type (NH4)xMn8O16and quenching from 440°C during heating in flowing Ar. The unit-cell dimension was determined by XRD analysis to bea=10.308(2) Å andc=2.854(1) Å. In comparison with that of the starting material (a=9.896(1) Å andc= 2.859(1) Å), theadimension increased while thecdimension changed little. No presence of ammonium ions in the structure of this specimen was shown by IR spectroscopy, the Kjeldahl analysis, or temperature-programmed-desorption (TPD) measurement. The structural change from the hollandite phase to Mn2O3was observed at 540°C. TPD analysis indicates the presence of nitrogen other than ammonium ions in the hollandite material we prepared, and also suggests that this nitrogen might have a strong chemical interaction to the hollandite structure.

AB - A single-phaseα-MnO2without any large stabilizing cations was successfully prepared by starting from hollandite-type (NH4)xMn8O16and quenching from 440°C during heating in flowing Ar. The unit-cell dimension was determined by XRD analysis to bea=10.308(2) Å andc=2.854(1) Å. In comparison with that of the starting material (a=9.896(1) Å andc= 2.859(1) Å), theadimension increased while thecdimension changed little. No presence of ammonium ions in the structure of this specimen was shown by IR spectroscopy, the Kjeldahl analysis, or temperature-programmed-desorption (TPD) measurement. The structural change from the hollandite phase to Mn2O3was observed at 540°C. TPD analysis indicates the presence of nitrogen other than ammonium ions in the hollandite material we prepared, and also suggests that this nitrogen might have a strong chemical interaction to the hollandite structure.

KW - 440°C

KW - ammonium ion

KW - hollandite structure

KW - quench

KW - α-MnO

UR - http://www.scopus.com/inward/record.url?scp=0000824313&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000824313&partnerID=8YFLogxK

U2 - 10.1006/jssc.1999.8133

DO - 10.1006/jssc.1999.8133

M3 - Article

AN - SCOPUS:0000824313

SN - 0022-4596

VL - 144

SP - 136

EP - 142

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 1

ER -