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フルテキストURLKJ00000155904.pdf ( 680.3KB ) 公開日 2010-04-19
タイトル鉱石鉱物の示差熱分析(II) : Cu-Fe-S系鉱物について
タイトルヨミコウセキ コウブツ ノ シサネツ ブンセキ 2 Cu-Fe-S ケイ コウブツ ニツイテ
タイトル別表記The Differential Thermal Analysis of Ore Minerals (II) : On Minerals of the System Cu-Fe-S
作成者苣木, 浅彦
島, 敞史
北風, 嵐
作成者ヨミスガキ, アサヒコ
シマ, ヒロミ
キタカゼ, アラシ
作成者別表記Sugaki, Asahiko
Shima, Hiromi
Kitakaze, Arashi
作成者所属山口大学工学部
内容記述(抄録等)Differential thermal analysis (DTA) was performed on natural and synthetic minerals of the system Cu-Fe-S to detect their thermal behavior such as phase change. It was carried out by method analizing in nitrogen atmosphere or by method using a sealed vacuum silica tube as sample holder. Calcined aluminum oxide was employed as an inert material. The rate of ascending temperature was regularly 5℃/min. during the analysis. The DTA curves (Fig.3) of pyrite show a large endothermic reaction beginning at 690℃ or 722℃ at which phase change from pyrite to pyrrhotite occurs. The curves (Fig.4) of natural pyrrhotite present two endothermic peaks which correspond to γ-type magnetic anomaly and β-type magnetic transformation at 240℃ and 320℃ respectively. The β transformation of monoclinic pyrrhotite requires more large amount of the latent heat than that of hexagonal pyrrhotite. The DTA curves (Fig.8) of covellite by both methods of the evacuated silica tube and nitrogen atmosphere show a strong endothermic reaction beginning at 508℃ and 475℃ respectively. It seems to indicate formation of digenite by dissociation of covellite. The curves (Fig.9) of chalcocite also show large and small endothermic peaks beginning at temperature from 100℃ to 105℃ and at temperature from 400℃ to 460℃, corresponding to two transitions from orthorhombic to hexagonal form and from hexagonal to cubic form respectively. The curves (Fig.10) of chalcopyrite have a distinct endothermic peak which seems to represent the latent heat of transformation from α-form of tetragonal lattice to γ-form of cubic face centered lattice, beginning at 554℃ (evacuated silica tube) or 540℃ (nitrogen atmosphere). The curves (Fig.11) of bornite indicate an endothermic reaction with two steps at approximate 200℃ and 270℃. It is considered to represent the high-low inversion of bornite polymorphism. Cubanite is also found to transform from low temperature form to high temperature form by the DTA curves (Fig.12) showing a distinct endothermic peak beginning at 254°±3℃. In the case of the reaction accompanied with dissociation of sulfur, the reaction temperature obtained by both methods differs. Namely such an endothermic reaction in the nitrogen atmosphere occurs at lower temperature than that of the means using the evacuated silica tube method.
本文言語jpn
主題材料工学
資料タイプtext
ファイル形式application/pdf
出版者山口大学工学部
出版者ヨミヤマグチ ダイガク コウガクブ
NII資料タイプ紀要論文
ISSN0372-7661
NCIDAN00244228
学内刊行物(紀要等)山口大学工学部研究報告
掲載誌名山口大学工学部研究報告
掲載誌名別表記Memoirs of the Faculty of Engineering, Yamaguchi University
22
2
開始ページ203
終了ページ214
発行日1971
著者版/出版社版出版社版
備考本文データは国立情報学研究所において電子化したものである
リポジトリIDKJ00000155904
地域区分山口大学
URIhttp://www.lib.yamaguchi-u.ac.jp/yunoca/handle/KJ00000155904