Conventionally the space group of the individual member in orthopyroxenes is Pbca. Up to the present it is known that there are only a few orthopyroxene specimens found in lunar rocks and meteorites to possess space g...Conventionally the space group of the individual member in orthopyroxenes is Pbca. Up to the present it is known that there are only a few orthopyroxene specimens found in lunar rocks and meteorites to possess space group P21ca. Having investigated the hypersthene megacryst from norite pegmatite in Blackhill, Chengde, Hebei Province, the authors affirm that the space group of the host for the megacryst is P21ca. Thus, it is considered that as a low orthopyroxene polymorph of space group P21ca it is firstly discovered on Earth.展开更多
[Objectives]The paper was to explore a new method for preparing nano ZnO particles.[Methods]A mixture of 2,6-di(2′,4′-dicarboxylphenyl)pyridine(0.05 mM),Zn(NO_(3))2·6H_(2)O(0.1 mM)were added to the solution of ...[Objectives]The paper was to explore a new method for preparing nano ZnO particles.[Methods]A mixture of 2,6-di(2′,4′-dicarboxylphenyl)pyridine(0.05 mM),Zn(NO_(3))2·6H_(2)O(0.1 mM)were added to the solution of DMA(3 mL)and H_(2)O(3 mL),and heated at 90℃for 12 h.The PXRD,TGA and fluorescence properties were characterized.[Results]Transparent block crystals of the[Zn_(2)(2,6-ddpp)(DMA)_(3)(H_(2)O)·H_(2)O]n were obtained(yield 85.4%,based on Zn).The Zn-MOF framework would collapse to form ZnO particles when the temperature exceeded 350℃.[Conclusions]A new Zn(II)-MOF is successfully constructed,and the compound exhibits monoclinic P21/c space group.The results will provide a theoretical basis for the preparation of nano ZnO.展开更多
基金Project supported by the National Natural Science Foundation of China
文摘Conventionally the space group of the individual member in orthopyroxenes is Pbca. Up to the present it is known that there are only a few orthopyroxene specimens found in lunar rocks and meteorites to possess space group P21ca. Having investigated the hypersthene megacryst from norite pegmatite in Blackhill, Chengde, Hebei Province, the authors affirm that the space group of the host for the megacryst is P21ca. Thus, it is considered that as a low orthopyroxene polymorph of space group P21ca it is firstly discovered on Earth.
基金Supported by Natural Science Foundation of Hainan Province(320QN355).
文摘[Objectives]The paper was to explore a new method for preparing nano ZnO particles.[Methods]A mixture of 2,6-di(2′,4′-dicarboxylphenyl)pyridine(0.05 mM),Zn(NO_(3))2·6H_(2)O(0.1 mM)were added to the solution of DMA(3 mL)and H_(2)O(3 mL),and heated at 90℃for 12 h.The PXRD,TGA and fluorescence properties were characterized.[Results]Transparent block crystals of the[Zn_(2)(2,6-ddpp)(DMA)_(3)(H_(2)O)·H_(2)O]n were obtained(yield 85.4%,based on Zn).The Zn-MOF framework would collapse to form ZnO particles when the temperature exceeded 350℃.[Conclusions]A new Zn(II)-MOF is successfully constructed,and the compound exhibits monoclinic P21/c space group.The results will provide a theoretical basis for the preparation of nano ZnO.
