共查询到20条相似文献,搜索用时 93 毫秒
1.
二价离子替代的Nasicon及其应用研究 总被引:2,自引:0,他引:2
含二价阳离子的Nasicon,M ̄(2+)Nasicon(M=Mg、Ca、Sr、Zn)可由母体Na_3Zr_2Si_2PO_(12)(Nasicon)为起始原料与相应的二价离子的盐浓液或熔盐进行离子交换而制得。X射线衍射分析结果表明离子交换后的产物M ̄(2+)-Nasicon大多保持原母体的C_(2/c)结构。交流阻抗技术测定的电导率数据显示含不同的二价替代离子的Nasicon的电导率相差甚大。其中最好的是Mg ̄(2+)-Nasicon,其电导率在400℃时可达到1.48×10 ̄(-2)S/cm。Mg ̄(2+)-Nasicon用作微功率固态电池Mg/CuCl的电解质,该电池的开路电压为2.07V,短路电流为1mA。平均放电电压为1.6V,电池的放电容量是3.4mAH。 相似文献
2.
3.
采用碱锑化合物的镀制与铯氧激活可制备复合型Si光电发射材料(Si-Na_2Sb-Cs)-O-Cs,(Si-K_3Sb-Cs)-O-Cs,(Si-Cs_3Sb-·Cs)-O-Cs和(Si-Na_2KSb-Cs)-O-Cs,其最高灵敏度分别可达950,1050,150和2000μA/1m,其最低逸出功分别已达1.0,0.9,0.85和0.9eV。比较了复合型Si光电发射材料与Si和Na_2KSb(Cs)光电材料的一些性能参数,提出了复合型Si光电材料的表面原子模型;讨论了复合型S光电材料的光电发射过程并分析了碱锑过渡层的作用。 相似文献
4.
镧掺杂对CdO—SnO2系物相及性能的影响 总被引:2,自引:1,他引:1
在CdO-SnO2体系中加入La&3+可以提高钛铁矿型β-CdSnO3的热稳定性。通过对掺镧材料的物相及微结构的研究,认为La^2+部分固溶到β-CdSnO2晶格中要提高其稳定性的主要原因。并可控制掺镧方式及热处理温度来合成不同相组成的气敏材料,改善CdO-SnO2系的气敏性能。 相似文献
5.
在CdO-SnO_2体系中加入La ̄(3+)可以提高学钛铁矿型β-CdSnO_3的热稳定性。通过对掺镧材料的物相及微结构的研究、认为La ̄(3+)部分固溶到β-CdSnO_3品格中是提高其稳定性的主要原因。并可控制掺镧方式及热处理温度来合成不同相组成的气敏材料,改善CdO-SnO_2系的气敏性能。 相似文献
6.
7.
本文研究了Na掺杂对MTG-YBCO(YBa2-xNaxCu3Oy+40mol%Y2BaCuO5x=0.0、0.1、0.2)生长织构及其超导性能的影响。适量Na的掺入有利于MTG-YBCO沿(ab)面的生长,改善晶体生长的宏观形貌。同时,掺Na后MTG-YBCO试样的Tc,on变化不大,但Tc,off随掺杂量x的增加而降低,即超导转变宽度△T增大。适量Na掺杂改善了MTG-YBCO的临界电流密度特 相似文献
8.
9.
Nasicon型快离子导体Na1+xZr2-yM0.8ySixP3-xO12系统采用高温固相合成,春合成温度在1373K左右完成,该的合成温度在x不变的情况下,随着y的增大而降低,大多烽合成物为单斜晶系;空间群为C3/c。当y不变,x增大地基地率的变化是先增大,后减小。最佳导一的起始组成为x=1.5、y=0.1,其电导率在室温时为3.20×10^-4S/cm,在673K时为6.88×10^-2S/ 相似文献
10.
11.
Song Chen De-Yin Jeng Hadano H. Ishiguro Y. Nakayama M. Watanabe K. 《IEEE transactions on instrumentation and measurement》2003,52(5):1494-1500
A Nasicon (sodium super ion conductor) CO/sub 2/ gas sensor with a new structure is developed for monitoring CO/sub 2/ levels in the atmospheric air. In addition to the sensing and reference electrodes of a conventional Nasicon sensor, an auxiliary electrode, referred to as the base electrode, is provided with the new structure. The principle of CO/sub 2/ detection is the same as that of a conventional Nasicon sensor, but the durability is greatly improved by using a nonaqueous carbonate as the sensing material. Characterization has also revealed that the output voltage at the base electrode is closely correlated with the drift at the sensing electrode and is available for the drift compensation. 相似文献
12.
A detailed mechanism is proposed for the emergence of sodium to the cleavage-face of the superionic conductor Na β-alumina during high dose electron bombardment. It is based on Auger electron spectroscopy measurements and optical microscope observations of the bombarded surface, and it involves both electromigration of the mobile Na+ and fault formation at the cleavage-face resulting from induced internal stress. 相似文献
13.
The solid state ionic conductor CuTi2(PO4)3 belonging to the Nasicon family has been synthesized; its lattice parameters have been obtained from X-ray diffraction patterns by comparison with isostructural NaTi2(PO4)3. The characterization of this light brown solid has been completed by IR and UV-visible spectroscopies. Reverse ion exchange between Cu and Na has been shown to occur in a molten salt bath. These properties are discussed through the main structural features of the MIM′IV2(PO4)3 family. 相似文献
14.
为提高蛭石的阳离子交换容量,以新疆蛭石为原料,通过液相离子交换法,用Na2CO3对其进行钠化改性处理。分析了矿浆浓度、反应温度、反应时间、Na2CO3浓度等因素对阳离子交换容量的影响,探讨了蛭石层间阳离子的交换特征。结果表明:当矿浆浓度为15%、反应温度为80℃、时间控制在24h、Na2CO3浓度为1.5mol/L时,钠型蛭石具有最大的阳离子交换容量0.92mmol/g。Na2CO3改性后新疆蛭石的阳离子交换容量和在水溶液中分散性均有显著提高。 相似文献
15.
A ceramic humidity sensor using alkali phosphate (tribasic), phosphoric acid and zircon as raw materials was studied. The ceramic body prepared by doping with sodium phosphate consists of zircon, Nasicon and probably glassy sodium polyphosphate. The sensitivity for humidity can be improved by doping with sodium phosphate and phosphoric acid. The specimen in which the mole ratio (Na/P) is nearly equal to one is desirable for a humidity sensor with respect to sensitivity, and the impedance is 2×106 cm or below in a dry atmosphere. The formation of Nasicon explains the decrease of impedance in the low humidity region and a decrease of impedance in the high humidity region can be achieved by the formation of sodium polyphosphate. 相似文献
16.
M. Kh. Balapanov G. R. Akmanova R. A. Yakshibaev R. Kh. Ishembetov 《Inorganic Materials》2008,44(6):566-568
A steady state silver transport in the superionic conductor Ag1.9Cu0.1Se in a temperature gradient has been analyzed. The parameters of the Soret effect have been determined, and the conditions for silver precipitation have been identified. The rate of silver precipitation is shown to increase with increasing temperature gradient and heat of silver transport. 相似文献
17.
Jean-Michel Dance 《Materials Research Bulletin》1980,15(3):373-377
The Fe3+ ion is used as an ESR probe to detect the mobility of the F? ions in the superionic conductor PbF2. At room temperature the ESR spectrum is characterized by a superhyperfine structure with 19A = 22 G. At rising temperature the s.h.f. structure collapses due to vacancy-diffusion with a hopping rate of about 4.108.s?1. 相似文献
18.
富硼渣钠化法制备硼砂的实验研究 总被引:1,自引:0,他引:1
采用X射线衍射分析(XRD)方法分析表明,富硼渣中的硼组分主要以Mg2B2O5形式存在,而钠化渣中的硼组分以Na4B2O5和NaBO2晶相形式析出.为提取富硼渣中的硼,考察了热处理温度、碳酸钠加入量、热处理时间、水浸温度等因素对钠化渣中硼浸出率的影响.同时考察了富硼渣中w(Al2O3)、w(CaO)、w(B2O3)、m... 相似文献
19.
In this paper, we report direct patterning of metal nanostructures using an embossed solid electrochemical stamp. Microforming of solid superionic stamps using Si templates--analogous to polymer patterning in nano-imprint lithography--is explored. Silver sulfide (Ag?S)--a superionic conductor with excellent microforming properties--is investigated as a candidate material. Important parameters of the superionic stamp, including mechanical behavior, material flow during forming and feature recovery after embossing, are studied. Excellent feature transferability during embossing as well as etching is observed. To illustrate the capability of this approach silver nano-antennas with gaps < 10 nm were successfully fabricated. The possibility for large area patterning with stamp diameters > 6 mm is also demonstrated. Embossing-based metal patterning allows fabrication beyond two-dimensional nanofabrication and several patterning schemes are reported. 相似文献
20.
用TiCl4水解法,以Na2CO3溶液为中和剂,通过相转移反应制备出纳米TiO2颗粒,此制备方法未见报道。制备产物经透射电子显微镜(TEM)和X-射线衍射仪(XRD)表征分析。实验证明,在Na2CO3溶液55℃条件下,将TiCl4从正辛醇溶液相中转移到水相,与水发生反应制得了纳米TiO2的前驱体Ti(OH)4。经过70℃真空干燥6h,在400℃下煅烧3h后,得到了分布均匀,少团聚的纳米TiO2颗粒。结合实验现象讨论了TiO2制备机理,包括TiCl4水解法反应机理、相转移反应机理和液相中生成固相微粒机理,说明了升高体系温度、以Na2CO3水溶液中和H+,使得反应液pH值在碱性条件下,有利于水解反应向正向移动。采用相转移反应方法和在液相中生成固相微粒过程中通过产物控制浓度,可以获得分布均匀,少团聚的纳米TiO2颗粒。 相似文献