Growth of Ca-germanide and Ca-silicide crystals by mechanical alloying

Yoshifumi Warashina; Yoshifumi Ito; Tamotsu Nakamura; Hirokazu Tatsuoka; Jeff Snyder; Miyoko Tanaka; Takashi Suemasu; Yoshikazu Anma; Masaru Shimomura; Yoshihiro Hayakawa

doi:10.1380/ejssnt.2009.129

Growth of Ca-germanide and Ca-silicide crystals by mechanical alloying

Yoshifumi Warashina, Yoshifumi Ito, Tamotsu Nakamura, Hirokazu Tatsuoka^*, Jeff Snyder, Miyoko Tanaka, Takashi Suemasu, Yoshikazu Anma, Masaru Shimomura, Yoshihiro Hayakawa

^*Corresponding author for this work

Materials Science and Engineering

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

5 Scopus citations

Abstract

Ca-germanide and Ca-silicide crystals were synthesized by mechanical alloying (MA). The resulting powders made from the Ca and Si powders contain Ca₂Si and/or Ca₅Si₃ phases with additional cubic phase crystals. The grown phases, namely Ca₂Si and Ca ₅Si₃, can be controlled by the Ca/Si ratio and the Si powder size. For the powders synthesized using the Ca and Ge powders, the cubic crystalline phase was synthesized. It was found that the powders synthesized from the Ca and Ge powders are covered by an amorphous layer that contains oxidized carbons. The Ca-based bulk tablets pressed from the powders show a p-type semiconducting behavior, though the powder surface is heavily oxidized, which might affect the transport property of the bulk.

Original language	English (US)
Pages (from-to)	129-133
Number of pages	5
Journal	e-Journal of Surface Science and Nanotechnology
Volume	7
DOIs	https://doi.org/10.1380/ejssnt.2009.129
State	Published - Jan 10 2009

Keywords

Alloys
Nano-particles
Powders
Quantum dots
Silicides
Supra-molecules
Transmission high-energy electron diffraction

ASJC Scopus subject areas

Biotechnology
Bioengineering
Condensed Matter Physics
Mechanics of Materials
Surfaces and Interfaces
Surfaces, Coatings and Films

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10.1380/ejssnt.2009.129

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title = "Growth of Ca-germanide and Ca-silicide crystals by mechanical alloying",

abstract = "Ca-germanide and Ca-silicide crystals were synthesized by mechanical alloying (MA). The resulting powders made from the Ca and Si powders contain Ca2Si and/or Ca5Si3 phases with additional cubic phase crystals. The grown phases, namely Ca2Si and Ca 5Si3, can be controlled by the Ca/Si ratio and the Si powder size. For the powders synthesized using the Ca and Ge powders, the cubic crystalline phase was synthesized. It was found that the powders synthesized from the Ca and Ge powders are covered by an amorphous layer that contains oxidized carbons. The Ca-based bulk tablets pressed from the powders show a p-type semiconducting behavior, though the powder surface is heavily oxidized, which might affect the transport property of the bulk.",

keywords = "Alloys, Nano-particles, Powders, Quantum dots, Silicides, Supra-molecules, Transmission high-energy electron diffraction",

author = "Yoshifumi Warashina and Yoshifumi Ito and Tamotsu Nakamura and Hirokazu Tatsuoka and Jeff Snyder and Miyoko Tanaka and Takashi Suemasu and Yoshikazu Anma and Masaru Shimomura and Yoshihiro Hayakawa",

year = "2009",

month = jan,

day = "10",

doi = "10.1380/ejssnt.2009.129",

language = "English (US)",

volume = "7",

pages = "129--133",

journal = "e-Journal of Surface Science and Nanotechnology",

issn = "1348-0391",

publisher = "The Japan Society of Vacuum and Surface Science",

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TY - JOUR

T1 - Growth of Ca-germanide and Ca-silicide crystals by mechanical alloying

AU - Warashina, Yoshifumi

AU - Ito, Yoshifumi

AU - Nakamura, Tamotsu

AU - Tatsuoka, Hirokazu

AU - Snyder, Jeff

AU - Tanaka, Miyoko

AU - Suemasu, Takashi

AU - Anma, Yoshikazu

AU - Shimomura, Masaru

AU - Hayakawa, Yoshihiro

PY - 2009/1/10

Y1 - 2009/1/10

N2 - Ca-germanide and Ca-silicide crystals were synthesized by mechanical alloying (MA). The resulting powders made from the Ca and Si powders contain Ca2Si and/or Ca5Si3 phases with additional cubic phase crystals. The grown phases, namely Ca2Si and Ca 5Si3, can be controlled by the Ca/Si ratio and the Si powder size. For the powders synthesized using the Ca and Ge powders, the cubic crystalline phase was synthesized. It was found that the powders synthesized from the Ca and Ge powders are covered by an amorphous layer that contains oxidized carbons. The Ca-based bulk tablets pressed from the powders show a p-type semiconducting behavior, though the powder surface is heavily oxidized, which might affect the transport property of the bulk.

AB - Ca-germanide and Ca-silicide crystals were synthesized by mechanical alloying (MA). The resulting powders made from the Ca and Si powders contain Ca2Si and/or Ca5Si3 phases with additional cubic phase crystals. The grown phases, namely Ca2Si and Ca 5Si3, can be controlled by the Ca/Si ratio and the Si powder size. For the powders synthesized using the Ca and Ge powders, the cubic crystalline phase was synthesized. It was found that the powders synthesized from the Ca and Ge powders are covered by an amorphous layer that contains oxidized carbons. The Ca-based bulk tablets pressed from the powders show a p-type semiconducting behavior, though the powder surface is heavily oxidized, which might affect the transport property of the bulk.

KW - Alloys

KW - Nano-particles

KW - Powders

KW - Quantum dots

KW - Silicides

KW - Supra-molecules

KW - Transmission high-energy electron diffraction

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U2 - 10.1380/ejssnt.2009.129

DO - 10.1380/ejssnt.2009.129

M3 - Article

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SN - 1348-0391

VL - 7

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EP - 133

JO - e-Journal of Surface Science and Nanotechnology

JF - e-Journal of Surface Science and Nanotechnology

ER -

Growth of Ca-germanide and Ca-silicide crystals by mechanical alloying

Abstract

Keywords

ASJC Scopus subject areas

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