巻号一覧
24 巻 (1984)
- 4 号 p. 137-
- 3 号 p. 89-
- 2 号 p. 47-
- 1 号 p. 1-
24 巻, 2 号
選択された号の論文の4件中1～4を表示しています
- |<
- <
- 1
- >
- >|
-
芝崎 靖雄1984 年 24 巻 2 号 p. 47-55
発行日: 1984/09/01
公開日: 2011/09/20
ジャーナル フリーThe plasticity are originally analyzed by speculating water content in ceramic body. Water in ceramic body are classified into two types; 1) free water occupied the space among particles (clay and other particles), and 2) water bonded to the surface of clay particle. These water can be distinguished by drying test at 40°C and 100°C, and measured as water content at each temperature. The monotonic or bent curve of free water content with increase of nonplastic mixture can be explained by the binary particle packing model. The binding water is normalized as characteristic value of plastic clay (CV) which is calculated as the ratio of binding water film on clay particles at room temperature and 40°C. The CV shows more dependence on the clay mineral species in the body than the clay content or the surface area. Clay for ceramic bodies of Japan are classified into 5 categories according to their constituent minerals. The CV is exceedingly consistent with the mineralogical classification and plasticity feeling test by hand. The CV is considered to be more adequate to estimate the plasticity of ceramic bodies than any other values proposed previously. It is also shown that the conception of the CV is useful to evaluate the plasticity of modern ceramic bodies (for example: Fe2O3, SiO2, SiC and Al2O3).抄録全体を表示PDF形式でダウンロード (1013K) -
中田 真一, 浅岡 佐知夫, 鈴木 功1984 年 24 巻 2 号 p. 56-68
発行日: 1984/09/01
公開日: 2011/09/20
ジャーナル フリーThe unique catalytic and adsorbent properties, crystal structures, ion-exchange and other characteristics of zeolites have been extensively investigated in recent years. The high-resolution solid-state 29Si-and 27Al-nuclear magnetic resonance (NMR) with magic angle spinning (MAS) have proved to be an useful tool for the chemical structural characterization of zeolites.
The article reviews how high-resolution solid-state NMR with MAS reveals unique insights into zeolite structures from recent literatures. Since five distinct Si-Al configurations, Si (OAl) n (OSi) 4-n (n=0-4), in zeolitic frameworks can be identified by 29Si-MAS NMR, several interesting problems have been enthusiastically discussed on 29Si-NMR analysis. In the present paper, the following topics are introduced and discussed:(1) Assignments of 29Si-chemical shifts and Si-Al configurations for aluminosilicates.(2) Discussion of Loewenstein's rule, the presence of Al-O-Al ordering, in the zeolite A.(3) Characteristic changes of Si/Al ratio in faujasites (zeolites X and Y) and mordenite studied by 29Si-NMR spectra.(4) 29Si-NMR spectral studies on the framework structures of pentasil zeolites such as ZSM-5, ZSM-11 and silicalite.(5) Stuidies of Ga3+ substitution for Al3+ in the zeolitic frameworks of faujasites studied by 29Si-NMR spectra.(6) Other 29Si-NMR spectral studies on zeolitic framework. On the other hand, 27Al-NMR has been used to estimate the compositions on tetrahedrally and octahedrally coordinated aluminum states. For instance, the dealumination mechanisms have been investigated by the 27Al-NMR spectral behaviors.
Furthermore the application of high-resolution solid-state 13C-NMR to the characteristic changes of organic compounds, in the zeolitic frameworks has been discussed.抄録全体を表示PDF形式でダウンロード (1288K) -
松峰・釈迦内・松木鉱床周辺井上 厚行, 歌田 実, 草部 博達1984 年 24 巻 2 号 p. 69-77
発行日: 1984/09/01
公開日: 2011/09/20
ジャーナル フリーVariations of mineral composition and exchangeable interlayer cation composition of clay minerals from altered rocks of Kuroko deposits have been determined by using samples obtained from eleven drillholes around the Matsumine, Shakanai, and Matsuki mines in the Hokuroku District, Japan. The composition of exchangeable interlayer cations of clay minerals, in particular the Ca/Na ratio, may have been strongly controlled by the chemical composition of hydrothermal solution in the site. Sericite/montmorillonite interstratified minerals occur in the mordenite, analcime, and K-feldspar zones as well as in the sintermediate zone between the montmorillonite and the sericite-chlorite zones. Such interstratified minerals contain comparatively large amounts of alkali metal cations as exchangeable interlayer cations. The variation of expandability in the interstratified minerals and the corresponding concentration of alkali metal cations in the minerals which were observed in the column of a drillhole are related to the percolation of hydrothermal solution containing large amounts of alkali metal cations.抄録全体を表示PDF形式でダウンロード (1097K) -
海峡中央部の概略と粘土化に関する基礎的検討立松 英信, 水野 清, 坂本 尚史, 大塚 良平1984 年 24 巻 2 号 p. 78-87
発行日: 1984/09/01
公開日: 2011/09/20
ジャーナル フリーMineralogical composition of representative rock samples from the pilot tunnel at the central part of the straits were investigated by means of X-ray diffraction technique, giving the result that they contained only a little amount of dioctahedral smectite as clay mineral.
Furthermore, in order to study the genesis of clay minerals occurring in the undersea portion of the straits experimentary, (1) obsidian from Tokachi district, Hokkaido, and (2) typical clay minerals obtained from exploratory horizontal borings were treated with artificial seawater under hydrothermal conditions. The materials and solutions after treatment were examined by means of X-ray diffraction technique and atomic absorption spectroscopy, respectively.
As a result, the following alteration processes were observed.
(1) obsidian→smectite
(2) dioctahedral and trioctahedral smectite→randomly interstratified chlorite/smec-tite→chlorite
(3) ordered interstratified chlorite/smectite→chlorite And the above alteration processes were found to be always accompanied by the decrease of Mg2+ in artificial seawater.
From the results obtained above, formation mechanism of clay minerals in the undersea portion of the straits could be considered as below; in the first stage, volcanic glass in the matrix of the rocks is changed to smectite, then the smectite is altered to chlorite through interstratified chlorite/smectite by forming brucite layer at its interlayer.抄録全体を表示PDF形式でダウンロード (1121K)
- |<
- <
- 1
- >
- >|