ALn1±xBi4±xS8(A=K,Rb;Ln=La,Ce,Pr,Nd): New Semiconducting Quaternary Bismuth Sulfides

Iordanidis, Lykourgos; Schindler, J. L.; Kannewurf, Carl R.; Kanatzidis, Mercouri G.

doi:10.1006/jssc.1998.8049

Cited by 28 publications

(31 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Die Wärmeleitfähigkeit des Gitters der letztgenannten Verbindung ist sogar noch geringer als bei Tl 2 SnTe 5 . [127,128] [139] ALn 1AEx Bi 4AEx S 8 [140] (A = K, Rb; Ln = La, Ce, Pr, Nd), BaLaBi 2 Q 6 [141] (Q = S, Se), a-,b-APbBi 3 Se 6 [142] (A = K, Rb, Cs), K 1Àx Sn 5Àx Bi 11+x Se 22 , [143] A 1+x M' 4À2x Bi 7+x Se 15 [144] (A = K, Rb; M' = Sn, Pb), [145] SnBi 4 Se 7 , [146] CdBi 2 S 4 , [147] CdBi 4 S 7 , [147] Cd 2.8 Bi 8.1 S 15 , [147] Cd 2 Bi 6 S 11 , [147] Ba 3 Bi 6.67 Se 13 [148] und Ba 3 MBi 6 Se 13 [148] (M = Sn, Pb) zu nennen. Derartige Verbindungen haben eine niedrige Wärmeleitfähigkeit, hohe Thermokraft und oftmals eine hohe elektrische Leitfähigkeit, [133,134,149,150] Eine der bemerkenswertesten Phasen ist b-K 2 Bi 8 Se 13 , das wegen seiner geringen Wärmeleitfähigkeit und seines relativ hohen Leistungsfaktors interessant ist.…”

Section: Intermetallische Halb-heusler-verbindungenunclassified

Alte und neue Konzepte für thermoelektrische Materialien

2009

View full text Add to dashboard Cite

Grundkonzepte für die Erforschung thermoelektrischer Materialien, der gegenwärtige Kenntnisstand und neueste Entwicklungen auf dem Gebiet sind die Themen dieses Aufsatzes. In aktuellen Forschungsarbeiten werden der Leistungsfaktor maximiert und/oder die Wärmeleitfähigkeit minimiert, um höhere ZT–Werte zu erzielen. Ansätze zur Maximierung des Leistungsfaktors sind die Entwicklung neuer oder das Optimieren existierender Materialien durch Dotieren sowie die Erforschung nanoskaliger Materialien. Die Wärmeleitfähigkeit kann minimiert werden durch das Herstellen fester Lösungen, die Verwendung von Materialien mit niedriger intrinsischer Wärmeleitfähigkeit und durch Nanostrukturierung. Dieser Aufsatz beschreibt die aussichtsreichsten thermoelektrischen Bulkmaterialien unter Berücksichtigung der während des letzten Jahrzehnts gewonnenen Erkenntnisse. Zu Beginn werden die Kristallstruktur und die chemischen und physikalischen Eigenschaften einphasiger Bulkmaterialien sowie die Optimierung ihrer thermoelektrischen Leistung diskutiert. Anschließend wird untersucht, welche neuen Möglichkeiten sich durch den Einsatz nanostrukturierter Kompositmaterialien ergeben. Den Abschluss bildet ein Ausblick in die fernere Zukunft.

show abstract

Section: Intermetallische Halb-heusler-verbindungenunclassified

Alte und neue Konzepte für thermoelektrische Materialien

2009

View full text Add to dashboard Cite

show abstract

“…More recently, there has been attention paid to preparing quaternary rare-earth chalcoantimonites and chalcobismuthites, e.g. K 2 (Ln 2Àx )Sb 4+x Sb 4 Se 12 (Ln = La, Ce, Pr and Gd; Chen & Dorhout, 1997), K 2 Gd 2 Sb 2 Se 9 (Choi et al, 1999), K 2 La 2 Sb 2 S 9 (Choi et al, 1999), Na 9 Gd 5 Sb 8 S 26 (Park & Kim, 2001), BaLaBi 2 S 6 (Choi et al, 1997), ALn 1AEx Bi 4AEx S 8 (A = K and Rb, and Ln = La, Ce, Pr and Nd; Iordanidis et al, 1999) and Pb 2 Eu 2 Bi 6 Se 13 (Chung et al, 1998). These compounds possess complex structures, owing to the combination of the high coordination numbers found for lanthanides with discrete [PnQ 3 ] 3À , [PnQ 3+1 ] 3À and [PnQ 4 ] 5À anions and the extended networks of chalcoantimonites and chalcobismuthites.…”

Section: Commentmentioning

confidence: 99%

Europium antimony sulfide, Eu₆Sb₆S₁₇

Jin¹,

Wells²,

Crerar³

et al. 2005

Acta Cryst E

View full text Add to dashboard Cite

Eu6Sb6S17 is isotypic with Sr6Sb6S17 and can be regarded as consisting of two isolated [Sb3S7]5− anions and an S32− polysulfide anion that are joined together by Eu2+ cations. There are six crystallographically unique Eu2+ cations bound by sulfide and polysulfide anions in seven‐, eight‐ and nine‐coordinate environments. Each of the [Sb3S7]5− anions consists of a trinuclear assembly of corner‐sharing SbS3 units. The [Sb3S7]5− anions are connected by long (3.1 Å) Sb—S interactions, forming one‐dimensional ribbons running down the a axis and packed with opposing directions of polarity. The bent S32− anions stack in columns parallel to the a axis, oriented in opposing directions with respect to one another. The overall structure is three‐dimensional and has channels running down the a axis to house the stereochemically active lone pair of electrons on the Sb3+ centers. The presence of Eu2+ is supported by both magnetic measurements and bond‐valence calculations.

show abstract

“…Some of the new compounds include KBi 3 S 5 [66], KBi 6.33 S 10 [67,68], K 2 Bi 8 S 13 [67,68], a-, b-K 2 Bi 8 Se 13 [69,70], K 2.5 Bi 8.5 Se 14 [70], A x Bi 4 Se 7 [71] (x = 1, 2), BaBiTe 3 [72], CsBi 4 Te 6 [73], ALn 1-x Bi 4-x S 8 [74] (A = K, Rb and Ln = La, Ce, Pr, Nd), BaLa-Bi 2 Q 6 [75] (Q = S, Se), a-, b-APbBi 3 Se 6 [76] (A = K, Rb, Cs), K 1-x Sn 5-x Bi 11+x Se 22 [77] [82] (M = Sn, Pb). These types of compounds have shown low thermal conductivity, high thermopower, and often high electrical conductivity, with CsBi 4 Te 6 having a ZT value of 0.8 at 225 K [73].…”

Section: Alkali-metal Bismuth Chalcogenidementioning

confidence: 99%

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Kong

Hng

et al. 2014

Waste Energy Harvesting

View full text Add to dashboard Cite

Waste thermal energy (heat) is the second type of energy to be discussed. Usually, it is generated in a process by way of fuel combustion or chemical reaction, and then ''dumped'' into the environment even though it could still be reused for some useful and economic purpose. The essential quality of heat is not the amount but rather its ''value.'' The strategy of how to recover this heat depends in part on the temperature of the waste heat gases and the economics involved.Waste thermal energy is one of the largest sources of inexpensive, clean, and fuel-free energy available. The vast amount of heat that is discharged into the atmosphere everyday is one of the best sources of clean, fuel-free, and inexpensive energy. According to the US Department of Energy (DOE), up to 50 % of all fuels burned in the US goes unused into the atmosphere as waste heat is released to the atmosphere. Research indicates that the energy currently wasted by the industrial facilities in the U.S. could produce as much as 20 % of the total US electrical output with the associated 20 % reduction in greenhouse gas emissions. Various sources that can be classified as waste thermal energy (heat) with their properties are listed in Tables 4.1 , 4.2, 4.3, and 4.4 [1].Among the large quantities of waste heat that have been directly discharged into the Earth's environment, much of it is at temperatures which are too low to recover by using the conventional electrical power generators. Thermoelectric power generation, also known as thermoelectricity, has been demonstrated as a promising technology in the direct conversion of low-grade thermal energy, such as waste heat energy into electrical power. Probably, the earliest application is the utilization of waste heat from a kerosene lamp to provide thermoelectric energy to power a wireless device. Thermoelectric generators have also been used to provide small amounts electricity to remote regions, for instance, Northern Sweden, as an L. B. Kong et al., Waste Energy Harvesting, Lecture Notes in Energy 24,

show abstract

ALn1±xBi4±xS8(A=K,Rb;Ln=La,Ce,Pr,Nd): New Semiconducting Quaternary Bismuth Sulfides

Cited by 28 publications

References 32 publications

Alte und neue Konzepte für thermoelektrische Materialien

Alte und neue Konzepte für thermoelektrische Materialien

Europium antimony sulfide, Eu₆Sb₆S₁₇

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Contact Info

Product

Resources

About

ALn1±xBi4±xS8(A=K,Rb;Ln=La,Ce,Pr,Nd): New Semiconducting Quaternary Bismuth Sulfides

Cited by 28 publications

References 32 publications

Alte und neue Konzepte für thermoelektrische Materialien

Alte und neue Konzepte für thermoelektrische Materialien

Europium antimony sulfide, Eu6Sb6S17

Waste Thermal Energy Harvesting (I): Thermoelectric Effect

Contact Info

Product

Resources

About

Europium antimony sulfide, Eu₆Sb₆S₁₇