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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kovnir, Kirill
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024PbSe Quantum Dot Superlattice Thin Films for Thermoelectric Applicationscitations
- 2023Large-scale colloidal synthesis of chalcogenides for thermoelectric applicationscitations
- 2022High Seebeck coefficient from screen-printed colloidal PbSe nanocrystals thin filmcitations
- 2021Large-scale synthesis of semiconducting Cu(In,Ga)Se2 nanoparticles for screen printing applicationcitations
- 2021Compositional fluctuations mediated by excess tellurium in bismuth antimony telluride nanocomposite yields high thermoelectric performancecitations
- 2020Synergistic Computational-Experimental Discovery of Highly Selective PtCu Nanocluster Catalysts for Acetylene Semihydrogenationcitations
- 2020Scalable colloidal synthesis of Bi 2 Te 2.7 Se 0.3 plate-like particles give access to a high-performing n-type thermoelectric material for low temperature applicationcitations
- 2019Superstructural ordering in hexagonal CuInSe2 nanoparticlescitations
- 2018The Smaller the Better Hosting Trivalent Rare-Earth Guests in Cu-P Clathrate Cagescitations
- 2017High-efficiency thermoelectric Ba8Cu14Ge6P26 bridging the gap between tetrel-based and tetrel-free clathratescitations
- 2009Cationic Clathrate I Si46-xPxTey (6.6(1) < y < 7.5(1), x < 2y) : Crystal Structure, Homogeneity Range, and Physical Propertiescitations
- 2008The first silicon-based cationic clathrate III with high thermal stability: Si172-xPxTey (x=2y, y>20).citations
- 2007Sn20.5□3.5As22I8: A Largely Disordered Cationic Clathrate with a New Type of Superstructure and Abnormally Low Thermal Conductivitycitations
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article
Sn20.5□3.5As22I8: A Largely Disordered Cationic Clathrate with a New Type of Superstructure and Abnormally Low Thermal Conductivity
Abstract
Sn(20.5)As(22)I(8), a new cationic clathrate, has been prepared by using an ampoule technique. According to the X-ray powder diffraction data, it crystallizes in the face-centered cubic space group F23 or Fm(-)3 with a unit-cell parameter of a=22.1837(4) A. Single-crystal X-ray data allowed solution of the crystal structure in the subcell with a unit-cell parameter of a(0)=11.092(1) A and the space group Pm(-)3n (R=5.7 %). Sn(20.5)As(22)I(8) (or Sn(20.5) square(3.5)As(22)I(8), accounting for the vacancies in the framework) possesses the clathrate-I type crystal structure, with iodine atoms occupying the cages of the cationic framework composed of tin and arsenic atoms. The crystal structure is strongly disordered. The main features are a random distribution of vacancies, and shifts of the tin and arsenic atoms away from their ideal positions. The coordination of the tin atoms has been confirmed by using (119)Sn Mössbauer spectroscopy. Electron diffraction and high-resolution electron microscopy (HREM) analyses have confirmed the presence of the superstructure ordering, which results in a doubling of the unit-cell parameter and a change of the space group from Pm(-)3n to either F23 or Fm(-)3. Analysis of the crystal structure has led to the construction of four ordering models for the superstructure, which have been corroborated by HREM, and has also led to the identification of disordered regions originating from overlap of the different types of ordered domains. Sn(20.5)As(22)I(8) is a diamagnetic semiconductor with an estimated band gap of 0.45 eV; it displays abnormally low thermal conductivity, with the room temperature value being just 0.5 W m(-1) K(-1).