Dielectric Properties of ZnTiO3 Microwave Ceramics Consolidated with MgTiO3

STABILIZED ZNTIO, WAS PREPARED BY DOPING MAGNESIUM OXIDE THROUGH TRADITIONAL SOLID-STATE REACTION. THE EXPERIMENTAL RESULTS INDICATE THAT ZINC TITANATE CRYSTALS DOPED WITH MAGNESIUM OXIDE GROW WELL AND THE DECOMPOSITION INTO ZN2TIO4 AND TIO2 IS RESTRAINED THROUGH TRADITIONAL SOLID STATE REACTION. BY ADJUSTING MOLAR RATIO OF MGO, BETTER PROPERTIES CAN BE OBTAINED. THE DIELECTRIC PROPERTIES OF THE CERAMICS DOPED WITH 30% MGO( MOLAR PERCENTAGE) SINTERED AT 1 060 ℃ ARE AS FOLLOWS:THE VALUE OF QUALITY FACTOR IS GREATER THAN 20 000(6. 5 GHZ), THE TEMPERATURE COEFFICIENT OF RESONANCE FREQUENCY IS ABOUT 2 × 10-6/℃, THE DIELECTRIC CONSTANT RANGES FROM 18 TO 22. BESIDES, IT IS PROVED THAT HEAT TREATMENT CAN OPTIMIZE MICROSTRUCTURE AND THE VALUE OF QUALITY FACTOR, WHICH INCREASES FROM 23 833.93 TO 47 584.00 AFTER 2 H OF HEAT TREATMENT AT 1 040 ℃.     

酞菁铜的电化学性质研究

文章按文献所述方法制备酞菁铜粉体,制备了酞菁铜膜电极,用循环伏安法研究了它的电化学性质。在0.1mol/L KCL＋0．01 mol/L[Fe(CN)6]3-的溶液中,酞菁膜电极上可以进行可逆的电荷传递,并对氧还原有催化作用。     

对TEA—氨性缓冲系配位滴定FBT指示剂返色问题的探讨

本文通过实验讨论，提出在TEA-氨性缓冲体系中配位滴定，如果尚存在其同离子Fe^ 3和Al^ 3时，虽然有TEA作为掩蔽剂，尚不能消除Fe^ 3和Al^ 3对指示剂EBT的作用，即终点后极易返色。从而提出在上述体系中不用EBT指示剂。     

炉窑处理湿法炼锌浸出渣研究进展

综述了国内外炉窑处理湿法炼锌浸出渣的各种工艺,特别是国内在该领域取得的最新成果,分析了各种工艺的优点和不足,为企业用炉窑处理湿法炼锌浸出渣的工艺选择提供参考。具体实践中应根据浸出渣的特征,结合企业的生产实际,选择既满足环保要求又具有一定经济效益的回收工艺,实现清洁生产和可持续发展。     

MOVPE法生长HgCdTe/CdZnTe结构薄膜研究

碲锌镉(CdZnTe)衬底是生长红外焦平面列阵(IRFPAs)所用碲镉汞(HgCdTe)薄膜材料的首选衬底.本文讨论在单晶的碲锌镉衬底上,用MOVPE法生长一层碲锌镉过渡层,可以避免单晶碲锌镉衬底的一些杂质和缺陷延伸到碲镉汞薄膜材料中而影响到碲镉汞薄膜的结构质量.实验表明,有碲锌镉过渡层的碲镉汞薄膜的结构质量有了较大改善.     

Effect of the amount of zinc-doped on the electrochemical performance of nickel hydroxide

1.IntroductionInrecentyears,theNi-MHbattery,akindofnewtypesecondarybatterydevelopedonthebaseofrechargeableNi-Cdbattery,hasattractedtheattentionofmostcustomersintheworldduetotheirexcellentperformancessuchashighpowerdensity,verygoodcyclability,highspecificcapacityandlessenviron-mentalimpact.Currently,theNi-MHbatteryiswidelyusedasapowerforportableelectricdevices,electricvehicles,portablevideos,andsomeimportantsmallapplications[1-3].Nickelhydroxideiscommonlyusedastheactivematerialfornickelposit…     

酞菁镍的电化学性质研究

文章按文献所述方法合成了酞菁镍粉体，制备了酞菁镍膜电板，用循环伏安法研究了酞菁镍的电化学性质；在0．1mol/L KCl 0．0lmol/L K3[Fe(CN)6]的溶液中，酞菁镍膜电板上可以进行可逆的电荷传递，并对氧还原有明显的抑制作用。     

锌钙系防锈磷化工艺

研究了锌钙系磷化工艺．以磷化膜质量和防锈性为定量指标，讨论了操作参数（总酸度、游离酸度、温度、时间和酸比）对磷化膜的影响，确定了最佳磷化工艺．结果表明：该磷化工艺稳定，维护简单，所得磷化膜防锈性优良．由磷化机理分析表明，磷化膜的组成为Zn3（PO4）2和Ca3（PO4）2．     

锌对蒜根尖细胞的毒害作用

用不同浓度（１００—５００ｍ ｇ／１）的硝酸锌溶液处理蒜小鳞茎,发现随着培养时间的延长和浓度的增加,毒害加重,外观表现为根尖生长受阻,内部表现为细胞有丝分裂指数下降,而分裂细胞异常率增高。分裂细胞异常主要表现为染色体粘连,染色体解体,微核及核解体等,但锌对蒜的毒害作用明显低于镉和铅