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AgSnO_(2)In_(2)O_(3)内氧化工艺中添加剂Te在合金中存在状态及其合金丝材退火条件的探究
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作者 张顺乐 胡烈鹏 鲍再君 《电工材料》 CAS 2022年第3期69-73,共5页
制备含有TeO_(2)添加剂的AgSnO_(2)In_(2)O_(3)材料通常采用合金内氧化工艺,在内氧化工序之前需对Ag-Sn-In-Te合金丝材进行拉拔作业以期达到工艺要求的线径。添加Te元素会增加合金丝材的脆性,因此需进行退火操作。通过对Ag-Sn-In-Te合... 制备含有TeO_(2)添加剂的AgSnO_(2)In_(2)O_(3)材料通常采用合金内氧化工艺,在内氧化工序之前需对Ag-Sn-In-Te合金丝材进行拉拔作业以期达到工艺要求的线径。添加Te元素会增加合金丝材的脆性,因此需进行退火操作。通过对Ag-Sn-In-Te合金挤压丝材腐蚀后的金相分析,发现Te元素是以纤维状Ag_(2)Te的金属间化合物状态均匀分布在合金晶格里;然后对该合金丝材进行不同条件的退火处理,通过对退火后合金金相组织的观察,探究了合金丝材的退火条件,发现退火后纤维状的Ag_(2)Te会球化,而且还有向晶界聚集的趋势,温度越高、时间越长这种效应越明显。 展开更多
关键词 agSnO_(2)In_(2)O_(3) 合金内氧化 添加剂te ag_(2)te金属间化合物 退火 球化
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N型Ag_(2)Te@PEDOT:PSS复合材料薄膜的制备与热电性能 被引量:3
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作者 宋海军 汤成莉 +1 位作者 张礼兵 孙权 《复合材料学报》 EI CAS CSCD 北大核心 2021年第7期2284-2294,共11页
利用一步热还原法制备了聚3,4-乙烯二氧噻吩:聚苯乙烯磺酸包覆的Te纳米线(Te@PEDOT:PSS)复合膜,然后将其浸入不同浓度的AgNO_(3)溶液中,通过Ag+与Te的反应使Te向Ag_(2)Te转变,从而使热电材料由P型的Te@PEDOT:PSS复合膜转化为N型的Ag_(2)... 利用一步热还原法制备了聚3,4-乙烯二氧噻吩:聚苯乙烯磺酸包覆的Te纳米线(Te@PEDOT:PSS)复合膜,然后将其浸入不同浓度的AgNO_(3)溶液中,通过Ag+与Te的反应使Te向Ag_(2)Te转变,从而使热电材料由P型的Te@PEDOT:PSS复合膜转化为N型的Ag_(2)Te@PEDOT:PSS复合膜。通过FESEM、TEM、XPS、XRD等表征手段揭示了掺杂过程中AgNO_(3)与Te@PEDOT:PSS复合膜的作用机制,探究了掺杂浓度对Ag_(2)Te@PEDOT:PSS复合膜热电性能的影响。反应中Ag_(2)Te@PEDOT:PSS复合膜的电导率随着AgNO_(3)溶液浓度的增加呈先增大后减小的趋势,主要是由于AgNO_(3)浓度较大时生成TeO2造成的,Seebeck系数随着AgNO_(3)浓度增大而迅速减小,主要是由于反应生成的Ag_(2)Te为N型传导,当Ag_(2)Te所提供的电子数量超过Te提供的空穴数量时,材料的传导机制由P型变为N型,即Seebeck系数由正变负,随着AgNO_(3)浓度的增大,Seebeck系数的绝对值变大,当AgNO_(3)溶液浓度为10 mmol时,Seebeck系数为(−55.9±3.3)μV/K。当AgNO_(3)溶液浓度为20 mmol时,N型Ag_(2)Te@PEDOT:PSS复合膜的功率因子达最大值,为(8.4±0.7)μW/(m·K2)。 展开更多
关键词 PEDOT:PSS ag_(2)te 复合材料 热电性能 薄膜 SEEBECK系数
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Phase-modulated mechanical and thermoelectric properties of Ag_(2)S_(1-x)Te_(x)ductile semiconductors 被引量:4
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作者 Liming Peng Shiqi Yang +5 位作者 Tian-Ran Wei Pengfei Qiu Jiong Yang Zhen Zhang Xun Shi Lidong Chen 《Journal of Materiomics》 SCIE 2022年第3期656-661,共6页
By virtue of the excellent plasticity and tunable transport properties,Ag_(2)S-based materials demonstrate an intriguing prospect for flexible or hetero-shaped thermoelectric applications.Among them,Ag_(2)S_(1-x)Te_(x... By virtue of the excellent plasticity and tunable transport properties,Ag_(2)S-based materials demonstrate an intriguing prospect for flexible or hetero-shaped thermoelectric applications.Among them,Ag_(2)S_(1-x)Te_(x)exhibits rich and interesting variations in crystal structure,mechanical and thermoelectric transport properties.However,Te alloying obviously introduces extremely large order-disorder distributions of cations and anions,leading to quite complicated crystal structures and thermoelectric properties.Detailed composition-structure-performance correlation of Ag_(2)S_(1-x)Te_(x)still remains to be established.In this work,we designed and prepared a series of Ag_(2)S_(1-x)Te_(x)(x=0-0.3)materials with low Te content.We discovered that the monoclinic-to-cubic phase transition occurs around x=0.16 at room temperature.Te alloying plays a similar role as heating in facilitating this monoclinic-to-cubic phase transition,which is analyzed based on the thermodynamic principles.Compared with the monoclinic counterparts,the cubic-structured phases are more ductile and softer in mechanical properties.In addition,the cubic phases show a degenerately semiconducting behavior with higher thermoelectric performance.A maximum zT=0.8 at 600 K and bending strain larger than 20% at room temperature were obtained in Ag_(2)S_(0.7)Te_(0.3).This work provides a useful guidance for designing Ag_(2)S-based alloys with enhanced plasticity and high thermoelectric performance. 展开更多
关键词 Thermoelectric materials ag_(2)S-ag_(2)te ductile semiconductors Phase transition Mechanical properties Transport properties
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Synergistic optimization of thermoelectric performance in p-type Ag2Te through Cu substitution 被引量:5
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作者 Ruonan Wu Zhili Li +4 位作者 Yongbo Li Li You Pengfei Luo Jiong Yang Jun Luo 《Journal of Materiomics》 SCIE EI 2019年第3期489-495,共7页
Superionic conductors,which exhibit liquid-like phonon transport but crystal-like carrier transport,have attracted great attention and broad research interest in the thermoelectric community.Ag_(2)Te is a superionic c... Superionic conductors,which exhibit liquid-like phonon transport but crystal-like carrier transport,have attracted great attention and broad research interest in the thermoelectric community.Ag_(2)Te is a superionic conductor;however,its small band gap and large Ag vacancy formation energy impede its application as a prominent p-type thermoelectric material.In this work,synergistic optimization of the thermoelectric performance of Ag_(2)Te through Cu substitution is realized through a combination of experimental and theoretical efforts.For the electrical transport,Cu substitution systematically increases the band gap of Ag_(2)Te and reduces the cation vacancy formation energy.These two beneficial effects simultaneously increase the electrical conductivity and suppress the bipolar effect,thereby greatly enhancing the p-type electrical transport properties of Ag_(2)Te.For the thermal transport,alloying Cu_(2)Te with Ag_(2)Te significantly reduces the thermal conductivity through not only point defect scattering but also softening of the interatomic interactions.The latter is attributed to the relatively small Cu atoms vibrating in the oversized 8c sites.This two-fold optimization results in maximum thermoelectric figure of merit zT values of over 1.3 at 773 K for both Ag_(1.2)Cu_(0.8)Te and AgCuTe,demonstrating the great potential of Ag_(2-x)Cu_(x)Te as a promising p-type thermoelectric material system. 展开更多
关键词 ag_(2)te Band gap Carrier concentration Thermoelectric material
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