A coupling model of pluralistic magnetic component R-T intermetallic compounds (R denotes rare earth, T denotes transition metal) has been proposed by means of the mean-molecular-field analysis. Using the model, the Curie temperature T, of (Sm1-x,Prx)2 Fe17 compounds has been cpmpared with the experimental values. It is found that the former are consistent with the later.

We report here temperature measurement by means of a Ga-filled C nanotube thermometer with diameter,150 nm and length; 12mm. The method relies on the initial identification and calibration of a nanothermometer in a transmission electron microscope TEM, followed by placing it into an air-filled furnace whose temperature is to be measured, and final TEM reading of a postmeasurement gradation mark visible inside the tubular channel. The mark originates from the fact that, at high temperature, the Ga column tip exposed to the air through the open C nanotube end oxidizes, and a thin Ga oxide layer sticks to the nanotube walls upon cooling. The temperature according to this gradation mark coincides closely with nominal furnace temperature controlled by standard means. The method paves the way for practical temperature measurements using a C nanothermometer in air and within spatially localized regions e.g., dimensions of tens of micrometers.

Si3N4/SiC interface structure in SiC-nanocrystal-embedded a-Si3N4 nanorods was studied by high-resolution transmission electron microscopy. The SiC-nanocrystal-embedded a-Si3N4 nanorods were synthesized by the method of carbothermal reduction of SiO in pure N2 atmosphere, while the SiC nanocrystals were produced from a substitution of SiC for Si3N4. Between SiC and Si3N4, there are three kinds of plane configurations and a set of orientation relationships, i.e., Si3N4, and nearly (111)SiC//(1010)Si3N4 with low-angle discrepancy of either 3

α-Si3N4 K15nanorods with 20-80 nm width were synthesized by carbothermal reduction of SiO with amorphous activated carbon (AAC) as a reductant. Microstructural characterization of the synthesized nanorods was carried out by high resolution transmission electron microscopy (HRTEM)and energy dispersive X-ray analysis. Many Si3N4 nanorods were found to be twisted. Each twisted nanorod contained several straight Si3N4 parts. The straight parts had the rod axes orientated along the〈1010〉direction, which is the closest packing direction of a-Si3N4. There were two kinds of joints between the two adjacent straight Si3N4 parts. Formation mechanism of the Si3N4 nanorods is discussed.

用高分辨电子显微学方法研究了Ni80Fe20/Mo磁性多层膜，结果表明：(1)多层膜的结晶状态，随Mo非磁性层厚度而变化。当Mo层厚度为0.7nm时，多层膜基本为非晶；当Mo层厚度大于116nm时，Mo层和NiFe层内分别结晶为体心立方和面心立方多晶，层内晶粒尺寸为2-6nm。(2)在Mo层厚度为1.6和2.1nm的多层膜中，NiFe层和Mo 层之间存在两种取向关系：(110) Mo∥(111) NiFe，[111]Mo∥[110]NiFe和（110）Mo∥（111）NiFe，[001 ]Mo ∥[ 110 ]NiFe(3) NiFe层和Mo层之间有较清晰的界面。界面附近3-4个原子层范围内，NiFe 和Mo 的面间距分别相对块状晶体沿生长方向膨胀和压缩。讨论了界面附近面间距的变化，并根据该多层膜显微结构特征，讨论了此系统未显示巨磁电阻效应的原因。