The nitrogenated alloys (Nd 0.7 Zr 0.3 )(Fe 0.75 Co 0.25 ) 11.5 Ti 0.5 N 1.3 (A) and Nd(Fe 0.8 Co 0.2 ) 11 Mo 1.0 N 1.0 (B) and the non-nitrogenated alloy (Sm 0.8 Zr 0.2 )(Fe 0.75 Co 0.25 ) 11.5 Ti 0.5 (C), having a ThMn 12 structure, show interesting magnetic properties and are candidate materials for hightemperature magnets. In this study, the stability of these materials was studied using Curie temperature measurements, differential scanning calorimetry, differential thermal analysis, thermogravimetry from room temperature to 1573 K, and X-ray diffraction of treated samples. The nitrogenated samples (A) and (B) started to decompose into the ¡-(Fe, Co) phase and other X-ray amorphous phases from about 800 and 1000 K, respectively. Sample (C) exists as a metastable phase at room temperature and decomposed above 700 K at a relatively high oxygen partial pressure (P O2 > 10 Pa), but the ThMn 12 structure remained up to at least 1373 K in an almost oxygen-free atmosphere (P O2 < 10 ¹15 Pa). Sample (C) is intrinsically stable at temperatures higher than about 1000 K up to the melting temperature, which was estimated to be 1480 K. The ThMn 12 structure in both R = Nd and Sm starting alloys is metastable at room temperature, and becomes unstable under 8001000 K. The decomposition rate was clearly dependent on the P O2 in the heated atmosphere, as high P O2 led to sample oxidation, and on the sample composition.

Magnetic, transport, and thermal properties of metallic η-carbides Co 6 M 6 C and Ni 6 M 6 C (M = Mo and W) with the cubic Ni 6 Mo 6 C-type structure have been characterized. The Ni-based compounds Ni 6 Mo 6 C and Ni 6 W 6 C are Pauli paramagnets with temperature-independent susceptibilities. Susceptibilities of the Co-based compounds Co 6 Mo 6 C and Co 6 W 6 C are enhanced and temperature-dependent. Co 6 Mo 6 C remains paramagnetic down to the lowest temperature, while Co 6 W 6 C undergoes an antiferromagnetic-type transition at 46 K. A metamagnetic transition was observed for Co 6 W 6 C at 20-30 T at the lowest temperatures. The correlation among the enhancements in the susceptibility, the resistivity, and the electronic specific heat suggests the presence of moderate electron correlation in these compounds.

In recent years, attention has been focused on woody biomass energy from the viewpoint of reducing environmental burden and effective use of local energy resources. However, the knowledge concerning the drying of the wood which becomes the fuel is poor, and it depends on the experience of the technician. Therefore, it is beneficial to develop a method that can obtain optimum drying and combustion conditions. However, in the drying process, complicated phenomena must be considered, and analysis of the drying process is difficult. In this study, we focused attention on the viewpoint of heat transfer considering evaporation. To establish a simple analysis method of the drying process, a heat transfer analysis program modeling the drying of wood balls containing moisture was created and analyzed. An experimental apparatus was also fabricated, and a dry experiment of filling wood ball group containing moisture was carried out. Numerical analysis of the temperature responses of spheres and air currents when hot air is flowed through a filled wooden group containing moisture and the drying process of the filled wood ball group was investigated. We compared the numerical analysis results obtained from the simulation with the temperature response characteristics by experiments on wood balls. In addition to investigating the validity of the simulation, the predictability of the dry completion time was evaluated.

Itinerant Electron Magnetism of η-Carbides Co 6 M 6 C and Ni 6 M 6 C (M: Mo and W). -The title compounds are characterized by XRD (cubic, space group Fd3m, Ni6Mo6C-type structure), magnetization, resistivity, and specific heat measurements. The Ni-based compounds are Pauli paramagnets with temperature-independent susceptibilities. The Co-based compounds exhibit enhanced temperature-dependent susceptibilities. Co 6 Mo 6 C remains paramagnetic down to 2 K, while Co 6 W 6 C undergoes an antiferromagnetic-type transition at 46 K. The compound is an itinerant electron antiferromagnet. The correlation among the enhancements in the susceptibility, the resistivity, and the electronic specific heat suggests the presence of moderate electron correlation in the title compounds. -(WAKI*, T.; FURUSAWA, D.; TABATA, Y.; MICHIOKA, C.; YOSHIMURA, K.; KONDO, A.; KINDO, K.; NAKAMURA, H.; J. Alloys Compd. 554 (2013) 21-24, http://dx.

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