The structures and thermal expansion properties of Lu 2−x FexMo 3 O 12 have been investigated by X-ray diffraction (XRD). XRD patterns at room temperature indicate that compounds Lu 2−x FexMo 3 O 12 with x ≤ 1.3 exhibit an orthorhombic structure with space group Pnca; compounds with x = 1.5 and 1.7 have a monoclinic structure with space group P 2 1 /a. Studies on thermal expansion properties show that the linear thermal expansion coefficients of orthorhombic phase vary from negative to positive with increasing Fe content. Attempts to make zero thermal expansion materials indicate that zero thermal expansion can be observed in Lu 1.3 Fe 0.7 Mo 3 O 12 in the temperature range of 200-400 • C.

Al-doping-induced magnetocapacitance in the multiferroic CuCrS 2 * Liu Rong-Deng(刘荣灯) a)b) , Liu Yun-Tao(刘蕴韬) a) , Chen Dong-Feng(陈东风) a) , He Lun-Hua(何伦华) b) , Yan Li-Qin(闫丽琴) b) , Wang Zhi-Cui(王志翠) b) , Sun Yang(孙 阳) b) , and Wang Fang-Wei(王芳卫) b) † a)

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The crystal structure, magnetism, and colossal magnetoresistance of Y 2 CrS * 4 Liu Rong-Deng(刘荣灯) a)b) , Liu Yun-Tao(刘蕴韬) a) , He Lun-Hua(何伦华) b) , Wang Zhi-Cui(王志翠) b) , Chen Dong-Feng(陈东风) a) , and Wang Fang-Wei(王芳卫) b) † a)

Microstructure evolution and mechanical properties in an Fe-17Cr-4Ni-4Cu alloy aged at 475 °C after different aging times were studied. Conventional transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) studies revealed the formation of 9R-structure Cu-rich precipitates and Cr-rich α’ phase by spinodal decomposition in the samples aged at 475 °C after 100–1000 h. The fine Cu-rich precipitates and Cr-rich α’ phase by spinodal decomposition lead to a significant increase in the hardness, together in the early stages (100 h). Continued aging to 500 h leads to increased precipitation of the Cr-rich α’, which provides significant strengthening, reaching maximum hardening, despite the continued loss of hardening by weakening by the Ostwald ripening of the Cu-rich precipitates. Extending the aging time to 1000 h leads to substantial reversed austenite transformation and a large number of ripening -copper precipitates that causes softening. The results of the impact tests showed that the major fracture mode was cleavage and/or quasi-cleavage.