Toru Hirayama

Thermal decomposition of basic copper carbonate, CuCO3 · Cu(OH)2 · H2O, in carbon dioxide atmosphere (0–50 atm)

Abstract The thermal decomposition of basic copper carbonate, CuCO 3 · Cu(OH) 2 · H 2 O, was studied by high-pressure DTA under high-pressure carbon dioxide (0–50 atm). The DTA-TG measurement in air showed that the peak temperature was influenced more by heating rate than by sample weight. Decomposition via dehydration and decarbonation was rapidly finished in a single step, and no intermediate was found. The decomposition temperature was strongly influenced by the partial pressure of carbon dioxide. The decomposition temperature increased in the range 0 atm P co 2 P co 2 = 7 atm. Explaining these phenomena was approached by various considerations.

Influence of the self-generated and controlled atmosphere on the thermal decomposition of basic nickel carbonate, NiCO3·2Ni(OH)2·4H2O

Abstract Thermal decomposition of basic nickel carbonate, NiCO3·2Ni(OH)2·4H2O, was studied by high pressure DTA using various types of sample holder under high pressure carbon dioxide and nitrogen (0–50 atm). The decomposition proceeded in two steps. In the first step, the water of crystallization evolved to give an anhydride, and in the next step both H2O and CO2 evolved to give NiO. The decomposition temperature increased as the pressure of carbon dioxide and nitrogen increased. The DTA peaks were changed by using different sample holders. The relationship between the decomposition temperature and the formation of self-generated atmosphere is discussed.

Thermal decomposition of basic carbonates of copper, zinc and cobalt under high pressures

Abstract The thermal decomposition of some basic carbonates (basic zinc and cobalt carbonates, synthesized malachite, natural malachite and natural azurite) was studied by DTA-TG, DTGA and high-pressure DTA. The thermal decomposition of basic carbonates was carried out under CO 2 and N 2 atmospheres, and the dependence of decomposition temperature on atmospheric pressure is presented and discussed. The relationship between CO 2 pressures and peak temperatures is classified into two groups: (1) the peak temperatures increased up to a comparatively low pressure, but became nearly constant above that pressure; (2) the peak temperatures depended on pressure to a comparatively high pressure.

The effect of gas atmospheres on resistivity of indium tin oxide films at high temperature

AbstractThe effects of heat treatment in Q2, O2 and N2, and Ar gases on the high temperature (500‡ C) electrical resistivity of indium tin oxide (ITO) film 52 nm thick prepared by chemical spray pyrolysis method were studied. The partial oxygen pressure effect on the resistivity was found to be

Electrical Poperties of Sb2O3-SrO-V2O5 Glasses and Crystallized Ones

P_{{\text{O}}_{\text{2}} }^{1/5}

Electrical Properties of Bi2O3-SrO-V2O5 Glasses and Glass-Ceramics

to

Thermal decomposition of basic bismuth carbonate under high pressures of CO2, and N2 up to 50 ATM

P_{{\text{O}}_{\text{2}} }^{1/3.5}