Structural, optical, and electrical properties of SmNbO4
Rare-earth orthoniobates constitute a class of materials that has been exploited due to their interesting physical properties depending on the lanthanide element. Besides paramagnetism, ferroelasticity, and negative compressibility, these materials are known by their interesting optical properties a...
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creator | Nico, C. Soares, M. R. N. Costa, F. M. Monteiro, T. Graça, M. P. F. |
description | Rare-earth orthoniobates constitute a class of materials that has been exploited due to their interesting physical properties depending on the lanthanide element. Besides paramagnetism, ferroelasticity, and negative compressibility, these materials are known by their interesting optical properties and mixed types of conduction processes (protonic, ionic, and electronic). In this work, two types of SmNbO4 samples were studied: polycrystalline samples, prepared by a sol-gel route using the Pechini method, and single crystalline fibres grown by the Laser Floating Zone technique. These samples were structurally characterized based on powder and single-crystal X-ray diffraction studies. A metastable tetragonal phase, stabilized by grain size, was identified in the synthesized powders. After a sintering process of such powders, a single monoclinic phase was obtained. Complementarily, scanning electron microscopy and Raman spectroscopy analyses were performed to these samples. Photoluminescence and photoluminescence excitation spectroscopic studies allowed identifying more than one optically active centre of the trivalent samarium ion in the analysed material. Impedance spectroscopy measurements have shown a large variation of the ac conductivity as a function of temperature, assigned to a protonic conduction and to native ionic conduction mechanisms. |
doi_str_mv | 10.1063/1.4958953 |
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After a sintering process of such powders, a single monoclinic phase was obtained. Complementarily, scanning electron microscopy and Raman spectroscopy analyses were performed to these samples. Photoluminescence and photoluminescence excitation spectroscopic studies allowed identifying more than one optically active centre of the trivalent samarium ion in the analysed material. Impedance spectroscopy measurements have shown a large variation of the ac conductivity as a function of temperature, assigned to a protonic conduction and to native ionic conduction mechanisms.</description><identifier>ISSN: 0021-8979</identifier><identifier>EISSN: 1089-7550</identifier><identifier>DOI: 10.1063/1.4958953</identifier><identifier>CODEN: JAPIAU</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Applied physics ; Compressibility ; Crystal structure ; Electrical properties ; Electrical resistivity ; Excitation spectra ; Ferroelasticity ; Floating structures ; Optical activity ; Optical properties ; Paramagnetism ; Photoluminescence ; Physical properties ; Raman spectroscopy ; Rare earth elements ; Samarium ; Scanning electron microscopy ; Single crystals ; Sintering (powder metallurgy) ; Sol-gel processes ; Spectroscopic analysis ; Spectrum analysis ; X-ray diffraction</subject><ispartof>Journal of applied physics, 2016-08, Vol.120 (5)</ispartof><rights>Author(s)</rights><rights>2016 Author(s). 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F.</creatorcontrib><title>Structural, optical, and electrical properties of SmNbO4</title><title>Journal of applied physics</title><description>Rare-earth orthoniobates constitute a class of materials that has been exploited due to their interesting physical properties depending on the lanthanide element. Besides paramagnetism, ferroelasticity, and negative compressibility, these materials are known by their interesting optical properties and mixed types of conduction processes (protonic, ionic, and electronic). In this work, two types of SmNbO4 samples were studied: polycrystalline samples, prepared by a sol-gel route using the Pechini method, and single crystalline fibres grown by the Laser Floating Zone technique. These samples were structurally characterized based on powder and single-crystal X-ray diffraction studies. A metastable tetragonal phase, stabilized by grain size, was identified in the synthesized powders. After a sintering process of such powders, a single monoclinic phase was obtained. Complementarily, scanning electron microscopy and Raman spectroscopy analyses were performed to these samples. Photoluminescence and photoluminescence excitation spectroscopic studies allowed identifying more than one optically active centre of the trivalent samarium ion in the analysed material. Impedance spectroscopy measurements have shown a large variation of the ac conductivity as a function of temperature, assigned to a protonic conduction and to native ionic conduction mechanisms.</description><subject>Applied physics</subject><subject>Compressibility</subject><subject>Crystal structure</subject><subject>Electrical properties</subject><subject>Electrical resistivity</subject><subject>Excitation spectra</subject><subject>Ferroelasticity</subject><subject>Floating structures</subject><subject>Optical activity</subject><subject>Optical properties</subject><subject>Paramagnetism</subject><subject>Photoluminescence</subject><subject>Physical properties</subject><subject>Raman spectroscopy</subject><subject>Rare earth elements</subject><subject>Samarium</subject><subject>Scanning electron microscopy</subject><subject>Single crystals</subject><subject>Sintering (powder metallurgy)</subject><subject>Sol-gel processes</subject><subject>Spectroscopic analysis</subject><subject>Spectrum analysis</subject><subject>X-ray diffraction</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqd0EtLAzEQB_AgCq7Vg99gwZPi1szmsclRii8o9lA9h2wesKXdrElW8Nu7pQXvnmYGfswMf4SuAc8Bc_IAcyqZkIycoAKwkFXDGD5FBcY1VEI28hxdpLTBGEAQWSCxznE0eYx6e1-GIXdm3-jelm7rTI77uRxiGFzMnUtl8OV6996u6CU683qb3NWxztDn89PH4rVarl7eFo_LyhBOc0VBEiuAgHFOe8aNtx63Djd1bbh1xALzQhjOhQPtDeUNtMLbRktteA2MzNDNYe_0xNfoUlabMMZ-OqlqqKEBKoFO6vagTAwpRefVELudjj8KsNoHo0Adg5ns3cEm02Wdu9D_D3-H-AfVYD35BYZHcHg</recordid><startdate>20160807</startdate><enddate>20160807</enddate><creator>Nico, C.</creator><creator>Soares, M. 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F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Structural, optical, and electrical properties of SmNbO4</atitle><jtitle>Journal of applied physics</jtitle><date>2016-08-07</date><risdate>2016</risdate><volume>120</volume><issue>5</issue><issn>0021-8979</issn><eissn>1089-7550</eissn><coden>JAPIAU</coden><abstract>Rare-earth orthoniobates constitute a class of materials that has been exploited due to their interesting physical properties depending on the lanthanide element. Besides paramagnetism, ferroelasticity, and negative compressibility, these materials are known by their interesting optical properties and mixed types of conduction processes (protonic, ionic, and electronic). In this work, two types of SmNbO4 samples were studied: polycrystalline samples, prepared by a sol-gel route using the Pechini method, and single crystalline fibres grown by the Laser Floating Zone technique. These samples were structurally characterized based on powder and single-crystal X-ray diffraction studies. A metastable tetragonal phase, stabilized by grain size, was identified in the synthesized powders. After a sintering process of such powders, a single monoclinic phase was obtained. Complementarily, scanning electron microscopy and Raman spectroscopy analyses were performed to these samples. Photoluminescence and photoluminescence excitation spectroscopic studies allowed identifying more than one optically active centre of the trivalent samarium ion in the analysed material. Impedance spectroscopy measurements have shown a large variation of the ac conductivity as a function of temperature, assigned to a protonic conduction and to native ionic conduction mechanisms.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4958953</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0001-6945-2759</orcidid><orcidid>https://orcid.org/0000-0002-6858-9507</orcidid></addata></record> |
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subjects | Applied physics Compressibility Crystal structure Electrical properties Electrical resistivity Excitation spectra Ferroelasticity Floating structures Optical activity Optical properties Paramagnetism Photoluminescence Physical properties Raman spectroscopy Rare earth elements Samarium Scanning electron microscopy Single crystals Sintering (powder metallurgy) Sol-gel processes Spectroscopic analysis Spectrum analysis X-ray diffraction |
title | Structural, optical, and electrical properties of SmNbO4 |
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