您现在的位置: 首页> 研究主题> 晶形

晶形

晶形的相关文献在1980年到2023年内共计1520篇,主要集中在化学工业、化学、轻工业、手工业 等领域,其中期刊论文188篇、会议论文11篇、专利文献1321篇;相关期刊147种,包括中南大学学报(自然科学版)、中国药业、影像技术等; 相关会议11种,包括改性塑料产业高端论坛暨余姚滨海新城涉塑产业招商对接会、中国塑协改性塑料专业委员会2013年年会、2010重金属污染综合防治技术研讨会、中国化工学会2008年石油化工学术年会暨北京化工研究院建院50周年学术报告会等;晶形的相关文献由3356位作者贡献,包括武乖利、G·科克雷尔、卢韵等。

晶形—发文量

期刊论文>

论文:188 占比:12.37%

会议论文>

论文:11 占比:0.72%

专利文献>

论文:1321 占比:86.91%

总计:1520篇

晶形—发文趋势图

晶形

-研究学者

  • 武乖利
  • G·科克雷尔
  • 卢韵
  • 张全良
  • 杜振兴
  • J·阿伦希姆
  • M·谢拉吉维茨
  • G·达米安
  • S·霍瓦特
  • 梅林雨
  • 期刊论文
  • 会议论文
  • 专利文献

搜索

排序:

年份

    • 庞爱民(编译); 黎小平(编译)
    • 摘要: 泽林斯基有机化学研究所应用超临界和液化CO_(2)气体方法制备超细CL-20颗粒泽林斯基有机化学研究所在液体和超临界CO及TFE介质中进行CL-20重结晶,选择性制备出了CL-20超细颗粒,这种新的制备方法可以有效地抑制多晶形微晶体的生成。将CO作为反溶剂应用于SAS和气体(GAS)制备方法,无论在何种工艺条件下都可以生成α-CL-20-CO溶剂化物。
    • 李美; 彭家惠
    • 摘要: 采用实验室模拟二水物湿法磷酸工艺制备不同晶形的磷石膏,测试其过滤性能和洗涤效果,然后将磷石膏充分水洗并煅烧成磷建筑石膏,测试其物理力学性能及微观形貌.结果表明:粗大斜方板状结晶的磷石膏过滤性能和洗涤效果最佳,磷石膏中可溶磷含量最少,胶结材的标准稠度需水量最大,绝干抗压强度最低;长径比(5~8):1的棱柱状结晶的磷石膏过滤性能较好,胶结材的性能最佳;细小的薄片状或细长的针状、棒状结晶的磷石膏过滤和洗涤性能最差,其胶结材的性能居中.从兼顾磷酸生产和磷石膏建材资源化利用出发,棱柱状结晶应为磷石膏晶形调控的方向.
    • 王君卓; 高广进; 郭明明; 贾晓鹏; 马红安; 肖宏宇; 李尚升; 宿太超; 胡美华; 胡强; 吴玉敏; 王健康; 韩飞; 于昆鹏
    • 摘要: 金刚石的限形生长有利于其后续加工.对于磨料级金刚石限形生长的研究已经比较透彻,但金刚石大单晶的限形生长尚缺乏全面系统的研究.本文以FeNi(64wt%:36wt%)合金为触媒,利用高温高压下的温度梯度法在5.6 GPa时对不同温度下分别沿(100)面和(111)面生长的Ib型金刚石大单晶的晶形进行了研究.研究表明:随着温度的升高,沿(100)晶面生长的金刚石大单晶的晶形分别为板状、塔状直至尖塔状,而沿(111)面生长的金刚石大单晶的晶形则分别为塔状和板状;分析了不同温度下分别沿(100)面和(111)面生长金刚石大单晶不同晶形高径比的变化情况.利用不同压力和温度下的金刚石大单晶合成实验绘制了沿(100)和(111)面生长金刚石大单晶的晶形在V形生长区域内的分布示意图,表明沿(111)面生长的金刚石大单晶V形区温度下限明显比以(100)面生长的高,而沿这两面生长金刚石大单晶的V形区温度上限差别并不明显.对不同生长面V形区温度上下限的差别进行了解释,据此实现了Ib型金刚石大单晶的限形生长.
    • 彭舒敏; 冯炀; 颜登峰; 叶军芳; 易春旺
    • 摘要: 以己内酰胺聚合装置中不同浓度的萃取水和浓缩液为研究对象,通过高效液相色谱对其中的环状二聚体进行了定性定量分析,研究了不同浓度浓缩液中环状二聚体的结晶形态,并对环状二聚体的吸附团聚行为进行了静态模拟.结果表明:环状二聚体在浓缩液中以β晶型存在;浓缩液浓度越高,环状二聚体的聚集密度越高,团聚现象越严重;即使在低浓度的萃取水中,环状二聚体也会吸附己内酰胺发生团聚;红外光谱和X衍射分析表明随着浓缩液浓度的增加,环状二聚体的特征峰强度逐渐减弱直至消失,而己内酰胺的特征峰强度则越来越强.%The qualitative and quantitative analysis of cyclic dimmer was performed for extraction water and concentrated solu -tion with different concentration from a caprolactam polymerization plant by high -performance liquid charomatography .The crys-talline morphology of cyclic dimmer was studied in the concentrated solution with different concentration .The static simulation of the adsorption aggregation behavior of cyclic dimmer was conducted .The results showed that the cyclic dimmer existed in the concentrated solution in the form of βcrystal; the higher the concentration of concentrated solution , the higher the aggregation density and the severer the agglomeration of cyclic dimmer; cyclic dimmer could agglomerate with caprolactam even in the low-concentration concentrated solution;the characteristic peak intensity of cyclic dimmer was weakened until disappeared and the characteristic peak of caprolactam became more and more intensive as the concentration of the concentrated solution was in -creased.
    • 任勇
    • 摘要: 选用合适的晶形改进剂,改变一水柠檬酸晶体的晶形;并对改变晶形后的一水柠檬酸晶体的抗结块能力进行了测定。试验结果表明,合适的晶形改进剂可以有效改变一水柠檬酸晶体的晶形,但不能显著提高晶体的抗结块能力,单纯改变一水柠檬酸晶形,不能解决一水柠檬酸结块问题。
    • 摘要: 矿物晶体是地球历经亿万年沧桑岁月孕育而成的奇珍异葩,具有"天然的色泽纹理和自然的原始风貌",被人们称为"天然的艺术品"。通常是由生长在岩石的裂隙或空洞中的矿物单晶体所组成,呈簇状集合体,因其晶形美妙、构造奇特、色彩绚丽、品质稀有而受青睐。在我国,开发、流通和收藏矿物晶体,尚属新兴事物,广大赏石爱好者对矿物晶体的了解程度不够,相关知识匮乏,缺乏必要的收藏、鉴赏知识,再加上
    • 李洪奎; 李军; 禚传源; 耿科; 梁太涛
    • 摘要: Jiudian gold deposit is located in the North China plate in Jiaobei uplift.Its ore-bearing country rocks are late Jurassic Linglong granite.The origin of this deposit is post magmatic hydrothermal fissure filling quartz vein type gold deposit.According to metallogenic materials,precipitation sequences can be di-vided into five mineralization stages,such as pyritization- sericite quartz alteration (Ⅰ stage),quartz-magnetic pyrite and medium-coarse grained pyrite (Ⅱstage),quartz-pyrite and fine grained pyrite (Ⅲstage),quartz and multi-metal sulfide (Ⅳ stage)and quartz-carbonate rocks (Ⅴ stage).Among them,Ⅱstage,Ⅲ stage and Ⅳ stage are major gold enrichment and mineralization stages.On the basis of stud-ying standard type characteristics of pyrite and quartz in Jiudian gold deposit in Shandong province,accord-ing to the mineralization stages,five generations of pyrite have been divided,they are pyrite of Ⅰ stage formed in beresite,pyrite of Ⅱstage formed in pyrite quartz vein,pyrite of Ⅲ stage formed in quartz py-rite,pyrite of Ⅳ stage formed in polymetallic sulfide ores and pyrite of Ⅴ stage formed inquartz carbonate veins.Major pyrite crystal forms are single crystal as {100},{210},{1 1 1}and combination forms as {100}+{210},{100}+ {1 1 1 }and {100}+ {210 }+ {1 1 1 }.Accompanying with changes in the mineralization stage,cube occurrence rate gradually decreases,while occurrence rate of combination forms in pentagonal dodecahedron,cube + pentagonal dodecahedron gradually increased.In late stage of mineralization,cubic pyrite with high occurrence rate occurred.Crystal forms of pyrite in the pyrite quartz mineralization stage (Ⅲ stage)in Jiudian gold deposit are mainly composed of {100}+{210},while in pyrite polymetallic sul-fide mineralization stage (stage IV),crystal forms are minly composed of combination forms as {100}+{1 1 1}{100}+{210}+{1 1 1}.In the early and late stage,pyrite crystals are very simple.They are mainly composed of single crystal form as {100},{210},{1 1 1}.Through study on main components of pyrite,it is showed that pyrite mineralization stage perform the charactetistics of loss in S and rich in Fe.In the main metallogenic stage(Ⅲ,Ⅳ stage),pyrite is rich in S and loss in Fe.It reflects that the mineralization stage of polymetallic sulfide is not only the stage of gold enrichment,but also rapid enrichment of pyrite.It is in-dicated that geochemical environment with rich sulfur and loss of Fe is favorable for the precipitation of gold ore.The physical characteristics of pyrite and quartz scale also show that the parameters of pyrite and quartz are slightly higher in the polymetallic sulfide stage,which indicate that there is a corresponding re-lationship between the variation of reflectivity and unit cell parameters.%平度旧店金矿床位于华北板块之胶北隆起区内,其赋矿围岩为晚侏罗世玲珑花岗岩,矿床成因为岩浆期后热液裂隙充填石英脉型金矿。据成矿物质沉淀时序可分为Ⅰ黄铁矿化绢英岩化、Ⅱ石英磁黄铁矿中粗粒黄铁矿、Ⅲ石英黄铁矿微细粒黄铁矿、Ⅳ石英多金属硫化物和Ⅴ石英碳酸盐岩等5个成矿阶段,其中Ⅱ,Ⅲ,Ⅳ阶段为金的主要富集成矿阶段。该文在对山东平度旧店金矿床中黄铁矿和石英矿物标型特征研究的基础上,根据成矿阶段,划分出5个时代的黄铁矿,即形成于黄铁绢英岩中的Ⅰ阶段黄铁矿、黄铁矿石英脉中的Ⅱ阶段黄铁矿、石英黄铁矿矿石中的Ⅲ阶段黄铁矿、多金属硫化物矿石中的Ⅳ阶段黄铁矿和产于石英碳酸岩细脉中的Ⅴ阶段黄铁矿。黄铁矿晶形主要为{100},{210},{111}单晶形态,{100}+{210},{100}+{111}和{100}+{210}+{111}的聚形晶态,随着成矿阶段的变化,立方体出现率逐渐减小,五角十二面体、立方体+五角十二面体的聚形晶出现率则逐渐增加,直至晚期成矿阶段又有出现率高的立方体黄铁矿。旧店金矿在石英黄铁矿成矿阶段(Ⅲ阶段)中黄铁矿晶形以{100}+{210}为主,在多金属硫化物成矿阶段(Ⅳ阶段)中,黄铁矿晶形以{100}+{111}和{100}+{210}+{111}聚形为主,而在早期阶段和晚期阶段,黄铁矿晶形简单,以{100},{210},{111}单晶为主。对黄铁矿主成分的研究表明,成矿阶段黄铁矿表现为早期亏 S、富 Fe 的特点,在主成矿阶段Ⅲ,Ⅳ阶段中,黄铁矿则表现富 S、亏 Fe 的特点,反映了在多金属硫化物成矿阶段,不仅是金大量沉淀形成的时期,也是载金矿物黄铁矿快速富集沉淀的时期,说明富 S、亏 Fe 的地球化学环境有利于金的沉淀。黄铁矿物理特征及石英标型亦佐证了在多金属硫化物阶段的黄铁矿、石英晶胞参数稍高,说明同波谱段反射率和晶胞参数的变化与金含量有对应关系。
    • 燕翔
    • 摘要: 硫酸亚铁铵饱和溶液在有晶种存在的情况下可培养其单晶,单晶的晶形和生长速度受到浓度、温度、酸度、溶剂和生长空间等诸多外界因素的影响,实验研究了这些因素对培养硫酸亚铁铵单晶的影响并制备其单晶.
    • 黄辉胜; 胡武洪; 张国庆; 张福兰; 丁世敏
    • 摘要: 分别运用Materials Studio软件的CASTEP和Morphology模块对磷酸铁锂( LiFePO4)的结构和晶形进行计算模拟研究,获得其优化构型、电子结构、晶体形貌、晶面面积和晶面相对生长速率等特征参数。研究结果表明,PBE方法的计算精度明显高于 CA-PZ方法,化合物中的 Fe—O配位键本质上是共价键。 LiFePO4的理论模拟晶形为柱状晶体,与其块状的实测晶体形貌存在较大差异,这归因于理论模拟晶形是LiFePO4在真空中的生长晶习,而非真实环境下的晶习。在LiFePO4的实际晶形中,(020)晶面拥有较大的面积,这与该晶面的原子排列方式和原子占有率密切相关。此外,表面活性剂和LiFePO4各特征晶面之间可形成大量C—H…O氢键,将晶粒有效地包覆起来,降低其生长速率,从而抑制LiFePO4晶粒长大。%The geometric and electronic structures, crystal morphology, crystal facet area and the crystal facet relative growing velocity of LiFePO4 were theoretically investigated by the CASTEP and Morphology modules. The obtained results show that the PBE functional has better accuracy than CA-PZ functional. The Fe—O coordina-tion bonds are covalent in nature. Moreover, the simulated crystal morphology is columnar, which is obviously different from the experimental crystal morphology of flake. This is due to the calculated crystal morphology is the crystal habit of LiFePO4 under the vacuum condition, not in the actual environment. For the experimental mor-phology of LiFePO4, the area of the (0 2 0) crystal facet is large, which is closely related with the atomic ar-rangement and density on the crystal surface. Additionally, there are many C—H…O hydrogen bonds between surfactant and crystal facets of LiFePO4 , the crystallites are coated and their growing velocities slow down, and so the surfactant can control crystallite growth.
  • 查看更多

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号