Temat: Bi–Te - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effect of Electroless Ni–P Plating on the Bonding Strength of Bi–Te-Based Thermoelectric Modules
Autorzy:: Kim, S. S.
Son, I.
Kim, K. T.
Tematy:: thermoelectric
Ni–P plating
bonding strength
Bi–Te
soldering; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/356583.pdf Link otwiera się w nowym oknie
Opis:: In the present study, electroless Ni–P plating was applied to Bi–Te-based thermoelectric materials as a barrier layer and the effect of the Ni–P plating on the bonding strength of the thermoelectric module was investigated. The bonding strength of the n- and p-type modules increased after being subjected to the electroless Ni–P plating treatment. In the case of the thermoelectric module that was not subjected to electroless Ni–P plating, Sn and Te were interdiffused and formed a brittle Sn–Te-based metallic compound. The shearing mostly occurred on the bonding interface where such an intermetallic compound was formed. On the other hands, it was found from the FE-EPMA analysis of the bonding interface of thermoelectric module subjected to electroless Ni-P plating that the electroless Ni-P plating acted as an anti-diffusion layer, preventing the interdiffusion of Sn and Te. Therefore, by forming such an anti-diffusion layer on the surface of the Bi–Te based thermoelectric element, the bonding strength of the thermoelectric module could be increased.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Dilatometric Analysis of the Sintering Behavior of Bi2Te3 Thermoelectric Powders
Autorzy:: Han, Ju-Yeon
Byun, Jong Min
Lee, Young-In
Choi, Byung Joon
Kim, Hogyoung
Oh, Sung-Tag
Tematy:: Bi2Te3
dilatometric analysis
sintering behavior
microstructure; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354899.pdf Link otwiera się w nowym oknie
Opis:: The sintering behavior of p-type bismuth telluride powder is investigated by means of dilatometric analysis. The alloy powders, prepared by ball milling of melt-spun ribbons, exhibit refined and flake shape. Differential thermal analysis reveals that the endothermic peak at about 280°C corresponds to the melting of bismuth, and peaks existing between 410°C and 510°C are presumably due to the oxidation and crystallization of the powder. The shrinkage behavior of ball-milled powders was strongly dependent of heating rate by the thermal effect exerted on specimens. In the case of 2°C/min, the peak temperature for the densification is measured at 406°C, while the peak temperature at a heating rate of 20°C/min is approximately 443°C. The relative density of specimen pressureless-sintered at 500°C exhibited relatively low value, and thus further study is required in order to increase the density of sintered body.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Sn-Pd-Ni Electroplating on Bi2Te3-Based Thermoelectric Elements for Direct Thermocompression Bonding and Creation of a Reliable Bonding Interface
Autorzy:: Kang, Seok Jun
Bae, Sung Hwa
Son, Injoon
Tematy:: tin electroplating
thermoelectric module
thermocompression bonding
Bi2Te3
direct bonding; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2049169.pdf Link otwiera się w nowym oknie
Opis:: The Sn-Ag-Cu-based solder paste screen-printing method has primarily been used to fabricate Bi2Te3-based thermoelectric (TE) modules, as Sn-based solder alloys have a low melting temperature (approximately 220°C) and good wettability with Cu electrodes. However, this process may result in uneven solder thickness when the printing pressure is not constant. Therefore, we suggested a novel direct-bonding method between the Bi2Te3-based TE elements and the Cu electrode by electroplating a 100 μm Sn/ 1.3 μm Pd/ 3.5 μm Ni bonding layer onto the Bi2Te3-based TE elements. It was determined that there is a problem with the amount of precipitation and composition depending on the pH change, and that the results may vary depending on the composition of Pd. Thus, double plating layers were formed, Ni/Pd, which were widely commercialized. The Sn/Pd/Ni electroplating was highly reliable, resulting in a bonding strength of 8 MPa between the thermoelectric and Cu electrode components, while the Pd and Ni electroplated layer acted as a diffusion barrier between the Sn layer and the Bi2Te3 TE. This process of electroplating Sn/Pd/Ni onto the Bi2Te3 TE elements presents a novel method for the fabrication of TE modules without using the conventional Sn-alloy-paste screen-printing method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The Influence of Ag2Te Addition on Thermoelectric Properties of Bismuth Telluride
Autorzy:: Drzewowska, Sylwia
Lan, Tian-Wey
Onderka, Bogusław
Tematy:: thermoelectric materials
Seebeck coefficient
resistivity
thermal diffusivity
Bi2Te3-Ag2Te system; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2048873.pdf Link otwiera się w nowym oknie
Opis:: The resistivity, Seebeck coefficient and thermal diffusivity were determined for BiTe3 + Ag2Te composite mixtures. Subsequent measurements were carried out in the temperature range from 20 to 270°C, and for compositions from pure Bi2Te3 to xAg2Te = 0.65 selected along the pseudo-binary section of Ag-Bi-Te ternary system. It was found that conductivity vs. temperature dependence shows visible jump between 140 and 150°C in samples with highest Ag2Te content, which is due to monoclinic => cubic Ag2Te phase transformation. Measured Seebeck coefficient is negative for all samples indicating they are n-type semiconductors. Evaluated power factor is of the order 1.52·10-3 and it decreases with increasing Ag2Te content (at. %). Recalculated thermal conductivity is of the order of unity in W/(m K), and is decreasing with Ag2Te addition. Finally, evaluated Figure of Merit is 0.43 at 100°C and decreases with temperature rise.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Charakterystyka i geneza złotonośnej mineralizacji arsenowo-polimetalicznej w złożu Czarnów (Sudety Zachodnie)
The characteristic and genesis of the gold-bearing arsenic polymetallic mineralization in the Czarnów deposit (Western Sudetes)
Autorzy:: Mikulski, S. Z.
Tematy:: złoto
arsenopiryt
minerały Ag, Bi i Te
rudy
geochemia rud
izotopy siarki
geotermometria
Sudety
gold
arsenopyrite
Ag, Bi and Te minerals
ore
ore geochemistry
sulphur isotopes
geothermometry
Sudetes; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2063090.pdf Link otwiera się w nowym oknie
Opis:: Szczegółowe badania geochemiczno-mineralogiczne okruszcowanych skał ze złoża w Czarnowie wykazały obecność kilku różniących się składem i teksturą złotonośnych typów rud siarczkowo-polimetalicznych, występujących w żyle kwarcowej, jak również w skałach ją otaczających (łupki, amfibolity i skały węglanowo-krzemianowe). Średnia zawartość złota w zbadanych próbkach wynosi ok. 1,1 ppm arsenu i miedzi, odpowiednio 5,6 i 0,75% (n = 47). Zakres koncentracji złota w próbkach rud siarczkowych jest od ok. 1 do 2,5 ppm (maks. 12,6 ppm), przy zawartości As 3–15% i Cu 1–4%. W masywnych rudach arsenopirytowych koncentracje As mogą osiągać ok. 20–30%. W rudach polimetalicznych udokumentowano pojedyncze wysokie koncentracje Ag (380 ppm), Bi (0,55%) i Sn (0,4%). Krystalizacja złota przebiegała w co najmniej dwóch etapach. Pierwszy związany był z precypitacją złota submikroskopowego (1 µm śred.), w paragenezie z siarczkami metali podstawowych, minerałów Bi, Au, Ag i Te oraz krystalizacją kwarcu mleczno-białego w temperaturze 250–320°C. Następny etap okruszcowania zaznaczył się precypitacją przezroczystego kwarcu, młodszej generacji kalcytu, galeny oraz różnych siarkosoli, w temperaturach od 210 do 130°C. Najmłodszy etap mineralizacji związany był z procesami hipergenicznymi, co przejawia się zastępowaniem siarczków przez minerały wtórne. Geneza okruszcowania złotonośnego w złożu związana była z co najmniej dwoma oddzielnymi procesami precypitacji kruszców z roztworów hydrotermalnych pochodnych procesom magmowo-tektonicznym w strefie kontaktu granitoidów Karkonoszy ze skałami jej wschodniej osłony metamorficznej. Źródłem arsenu, miedzi, siarki (δ S34 CDT w siarczkach w zakresie od 0,07 do 4,33‰) i innych metali były oprócz waryscyjskich granitoidów również skały związane z dolnopaleozoiczną aktywnością magmowo-wulkaniczną w jednostce Kowar-Czarnowa. Po raz pierwszy w złożu rozpoznano następujące minerały: argentyt, joseit, matyldyt, treasuryt, stannin oraz najprawdopodobniej hessyt i protojoseit.
Detailed geochemical-mineralogical studies of ore samples from the Czarnów deposit revealed the presence of ores with different composition and texture of gold-bearing sulphide polymetallic ores. They are hosting by quartz vein and its country rocks (schists, amphibolites and calc-silicate rocks). An average content of Au is 1.06 ppm, of As – 5.6% and of Cu – 0.75% (n = 47). The range of gold contents in sulphide ores is from 1 to 2.5 ppm (max. 12.6 ppm) at As contents 3 to 15% and Cu 1 to 4%. In massive arsenopyrite ore As concentration reaches up to 20–30%. In polymetallic ores a single high contents of Ag (max. 380 ppm), Bi (max. 0.55%) and Sn (max. 0.4%) were documented. Gold precipitation underwent at least in 2 separate stages. The first one was connected with submicroscopic gold (<1 μm in size) mostly bound in arsenopyrite and minor in pyrrhotite in the range of a high temperature (380– 490°C) determined by application of the arsenopyrite geothermometer and of fluid inclusions study of grey and/or grey-white quartz (330– 420°C). The second stage was related to gold redistribution from arsenopyrite and precipitation of microscopic gold (>1μmin size) in paragenetic association with base metal sulphides, and Bi, Au, Ag and Te minerals and crystallization of milky-white quartz in the temperature range 250–320°C. Next stage of ore precipitation was connected with crystallization of transparent quartz and younger generation of calcite, associated by galena and variable composition sulphosalts, in temperature range 130–210°C. The youngest stage is connected with weathering processes and is marked by replacement of primary sulphides by secondary minerals. Genesis of auriferous mineralization in the Czarnów deposit was related to at least two separate stages of ore minerals precipitation from hydrothermal fluids connected with post-magmatic-tectonic evolution of the Karkonosze granite along its contact with the Eastern metamorphic cover. Source of gold, arsenic, copper, sulphur (δ S34 CDT in sulphides range from 0.07 to 4.33‰), and other metals, beside Variscan granites, were credibly rocks related to Lower Paleozoic magmatic-volcanic processes in the Kowary–Czarnów unit. For the first time the following minerals have been recognized in the deposit: argentite, joseite, matildite, treasurite, stannite and most probably hessite and protojoseite.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Materiały do chłodzenia termoelektrycznego
Materiały Elektroniczne 1983 nr 3(43)
Materiały do chłodzenia termoelektrycznego = Cooling thermoelectric materials
Autorzy:: Mogielnicki Henryk
Wydawca:: Wydaw. Przemysłu Maszynowego "WEMA"
Powiązania:: Materiały Elektroniczne
Electronic Materials
Opis:: s. 7-22 : il.
Bibliogr. s. 22
s. 7-22 : il. ; 24 cm.
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

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Skocz do pozycji: 7.

Tytuł:: Investigation of the Microstructure and Thermoelectric Properties of P-Type BiSbTe Alloys by Usage of Different Revolutions Per Minute (RPM) During Mechanical Milling
Autorzy:: Yoon, S.-M.
Madavali, B.
Yoon, Y.-N.
Hong, S.-J.
Tematy:: Bi0.5Sb1.5Te3 alloys
mechanical alloying
spark plasma sintering
thermoelectric properties; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354749.pdf Link otwiera się w nowym oknie
Opis:: In this work, p-type Bi_0.5Sb_1.5Te₃ alloys were fabricated by high-energy ball milling (MA) and spark plasma sintering. Different revolutions per minute (RPM)s were used in the MA process, and their effect on microstructure, and thermoelectric properties of p-type Bi_0.5Sb_1.5Te₃ were systematically investigated. The crystal structure of milled powders and sintered samples were characterized using X-ray diffraction. All the powders exhibited the same morphology albeit with slight differences find at 1100 RPM conditions. A slight grain size refinement was observed on the fracture surfaces from 500 to 1100 RPM specimens. The temperature dependence of Seebeck coefficient, electrical conductivity, and power factors were measured as a function of temperature with different RPM conditions. The power factor shows almost same (~3.5 W/mK² at RT) for all samples due to unchanged Seebeck and electrical conductivity values. The peak ZT of 1.07 at 375K is obtained for 1100 RPM specimen due to low thermal conductivity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Reduction of Thermal Conductivity through the Dispersion of TiC Nanoparticles into a p-Type Bi0.5Sb1.5Te3 Alloy by Ball Milling and Spark Plasma Sintering
Autorzy:: Nagarjuna, Cheenepalli
Madavali, Babu
Lee, Myeong-Won
Yoon, Suk-Min
Hong, Soon-Jik
Tematy:: Bi0.5Sb1.5Te3 alloys
nanocomposites
ball milling
spark plasma sintering
thermoelectric properties; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355940.pdf Link otwiera się w nowym oknie
Opis:: The dispersion of nanoparticles in the host matrix is a novel approach to enhance the thermoelectric performance. In this work, we incorporate the TiC (x = 0, 1 and 2 wt.%) nanoparticles into a p-type Bi_0.5Sb_1.5Te₃ matrix, and their effects on microstructure and thermoelectric properties were systematically investigated. The existence of TiC contents in a base matrix was confirmed by energy dispersive X-ray spectroscopy analysis. The grain size decreases with increasing the addition of TiC content due to grain boundary hardening where the dispersed nanoparticles acted as pinning points in the entire matrix. The electrical conductivity significantly decreased and the Seebeck coefficient was slightly enhanced, which attributes to the decrease in carrier concentration by the addition of TiC content. Meanwhile, the lowest thermal conductivity of 0.97 W/mK for the 2 wt.% TiC nanocomposite sample, which is ~16% lower than 0 wt.% TiC sample. The maximum figure of merit of 0.90 was obtained at 350 K for the 0 wt.% TiC sample due to high electrical conductivity. Moreover, the Vickers hardness was improved with increase the addition of TiC contents.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Effect of Ga2O3 Nanoparticles Dispersion on Microstructure and Thermoelectric Properties of p-Type BiSbTe Based Alloys
Autorzy:: Kim, E.-B.
Koo, J.-M.
Hong, S.-J.
Tematy:: thermoelectric properties
Bi0.5Sb1.5Te3 alloys
Seebeck coefficient
mechanical alloying
spark plasma sintering; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351366.pdf Link otwiera się w nowym oknie
Opis:: In this study, p-type Bi_0.5Sb_1.5Te₃ based nanocomposites with addition of different weight percentages of Ga₂O₃ nanoparticles are fabricated by mechanical milling and spark plasma sintering. The fracture surfaces of all Bi_0.5Sb_1.5Te₃ nanocomposites exhibited similar grain distribution on the entire fracture surface. The Vickers hardness is improved for the Bi_0.5Sb_1.5Te₃ nanocomposites with 6 wt% added Ga₂O₃ due to exhibiting fine microstructure, and dispersion strengthening mechanism. The Seebeck coefficient of Bi_0.5Sb_1.5Te₃ nanocomposites are significantly improved owing to the decrease in carrier concentration. The electrical conductivity is decreased rapidly upon the addition of Ga₂O₃ nanoparticle due to increasing carrier scattering at newly formed interfaces. The peak power factor of 3.24 W/mK² is achieved for the base Bi_0.5Sb_1.5Te₃ sintered bulk. TheBi_0.5Sb_1.5Te₃ nanocomposites show low power factor than base sample due to low electrical conductivity.
Dostawca treści:: Biblioteka Nauki

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