742a7e8ce8b64068c4be580ebb1d1e20 pmc_9959144.pdf 317c834a16fc613e2e8a5afbef05ad615a4f400e pmc_9959144.pdf d0f6718d1e669cf1c7b97dc9b3b1b80a82f53fa1329860abd5de0a15ca239bfc pmc_9959144.pdf Title: Enhanced Thermoelectric Properties of Misfit Bi2Sr2-xCaxCo2Oy: Isovalent Substitutions and Selective Phonon Scattering Subject: Layered Bi-misfit cobaltates, such as Bi2Sr2Co2Oy, are the natural superlattice of an electrically insulating rocksalt (RS) type Bi2Sr2O4 layer and electrically conducting CoO2 layer, stacked along the crystallographic c-axis. RS and CoO2 layers are related through charge compensation reactions (or charge transfer). Therefore, thermoelectric transport properties are affected when doping or substitution is carried out in the RS layer. In this work, we have shown improved thermoelectric properties of spark plasma sintered Bi2Sr2-xCaxCo2Oy alloys (x = 0, 0.3 and 0.5). The substitution of Ca atoms affects the thermal properties by introducing point-defect phonon scattering, while the electronic conductivity and thermopower remain unaltered. Keywords: misfit cobaltates; thermoelectric properties; misfit-layer; isovalent substitutions Author: Arindom Chatterjee, Ananya Banik, Alexandros El Sachat, José Manuel Caicedo Roque, Jessica Padilla-Pantoja, Clivia M. Sotomayor Torres, Kanishka Biswas, José Santiso and Emigdio Chavez-Angel Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Wed Feb 8 07:31:04 2023 CET ModDate: Wed Feb 8 07:35:10 2023 CET Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 12 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 2134219 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- BTFGED+VnURWPalladioL-Bold Type 1 Custom yes yes no 10 0 EYICVF+URWPalladioL-Bold Type 1 Custom yes yes no 15 0 SRWJLO+URWPalladioL-Roma Type 1 Custom yes yes no 20 0 VDATAK+URWPalladioL-Ital Type 1 Custom yes yes no 24 0 SEFGFO+EURM10 Type 1 Builtin yes yes no 28 0 GDXXCG+EURM7 Type 1 Builtin yes yes no 32 0 YOTXCC+TimesNewRomanPS-BoldItalicMT Type 1C WinAnsi yes yes no 51 0 VANSEP+CMSY10 Type 1 Builtin yes yes no 73 0 ERPOGD+PazoMath-Italic Type 1 Builtin yes yes no 80 0 GIGFZE+CMR10 Type 1 Builtin yes yes no 84 0 CPABGA+Symbol Type 1C Custom yes yes yes 108 0 CPABFA+TimesNewRoman CID TrueType Identity-H yes yes yes 113 0 CPABHB+Calibri,Bold CID TrueType Identity-H yes yes yes 119 0 COPNJO+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 125 0 COPNJP+PalatinoLinotype CID TrueType Identity-H yes yes yes 128 0 COPNKA+PalatinoLinotype TrueType WinAnsi yes yes no 134 0 COPNKC+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 137 0 CPABEP+BookmanOldStyle TrueType WinAnsi yes yes no 140 0 CPABGA+Symbol Type 1C Custom yes yes yes 165 0 CPABFA+TimesNewRoman CID TrueType Identity-H yes yes yes 170 0 CPABHB+Calibri,Bold CID TrueType Identity-H yes yes yes 176 0 COPNJO+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 182 0 COPNJP+PalatinoLinotype CID TrueType Identity-H yes yes yes 185 0 COPNKA+PalatinoLinotype TrueType WinAnsi yes yes no 191 0 COPNKC+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 194 0 CPABEP+BookmanOldStyle TrueType WinAnsi yes yes no 197 0 CIDFont+F3 CID TrueType Identity-H yes no yes 210 0 CIDFont+F1 CID TrueType Identity-H yes no yes 218 0 CIDFont+F2 CID TrueType Identity-H yes no yes 226 0 COPNJO+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 245 0 COPNJP+PalatinoLinotype CID TrueType Identity-H yes yes yes 248 0 COPNKA+PalatinoLinotype TrueType WinAnsi yes yes no 254 0 COPNKC+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 257 0 VHTXLZ+CMEX10 Type 1 Builtin yes yes no 265 0 COPNJO+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 279 0 COPNJP+PalatinoLinotype CID TrueType Identity-H yes yes yes 282 0 COPNKA+PalatinoLinotype TrueType WinAnsi yes yes no 288 0 COPNKC+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 291 0 CPAADD+CambriaMath CID TrueType Identity-H yes yes yes 294 0 TUGFYB+EURB7 Type 1 Builtin yes yes no 305 0 QHMKWQ+PazoMath Type 1 Builtin yes yes no 312 0 YVYBFX+VnURWPalladioL Type 1 Custom yes yes no 319 0 Jhove (Rel. 1.28.0, 2023-05-18) Date: 2023-12-15 02:34:49 CET RepresentationInformation: pmc_9959144.pdf ReportingModule: PDF-hul, Rel. 1.12.4 (2023-03-16) LastModified: 2023-03-16 02:18:09 CET Size: 2134219 Format: PDF Version: 1.7 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf PDFMetadata: Objects: 497 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: section.1 Item: Title: Experimental Methods Destination: section.2 Item: Title: Results and Discussion Destination: section.3 Children: Item: Title: Structural and Elementary Characterization Destination: subsection.3.1 Item: Title: Thermoelectric Transport Properties Destination: subsection.3.2 Item: Title: Summary Destination: section.4 Item: Title: References Destination: section.4 Info: Title: Enhanced Thermoelectric Properties of Misfit Bi2Sr2-xCaxCo2Oy: Isovalent Substitutions and Selective Phonon Scattering Author: Arindom Chatterjee, Ananya Banik, Alexandros El Sachat, José Manuel Caicedo Roque, Jessica Padilla-Pantoja, Clivia M. Sotomayor Torres, Kanishka Biswas, José Santiso and Emigdio Chavez-Angel Subject: Layered Bi-misfit cobaltates, such as Bi2Sr2Co2Oy, are the natural superlattice of an electrically insulating rocksalt (RS) type Bi2Sr2O4 layer and electrically conducting CoO2 layer, stacked along the crystallographic c-axis. RS and CoO2 layers are related through charge compensation reactions (or charge transfer). Therefore, thermoelectric transport properties are affected when doping or substitution is carried out in the RS layer. In this work, we have shown improved thermoelectric properties of spark plasma sintered Bi2Sr2-xCaxCo2Oy alloys (x = 0, 0.3 and 0.5). The substitution of Ca atoms affects the thermal properties by introducing point-defect phonon scattering, while the electronic conductivity and thermopower remain unaltered. 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