Frontiers in Magnetic Resonance

EPR and FMR of SiCN Ceramics and SiCN Magnetic Derivatives

Author(s): Sushil K. Misra and Sergey I. Andronenko

Pp: 197-224 (28)

DOI: 10.2174/9781681086934118010013

* (Excluding Mailing and Handling)

Abstract

Silicon nitro carbide, SiCN, exhibits excellent high-temperature properties. It can withstand temperatures of up to 1800° C, which is superior to those of Si, SiC and Si3N4. Magnetic composites, as well as electrically conductive ceramics on the basis of SiCN, can be developed. Therefore, SiCN constitutes a new class of materials for high-temperature electronics. SiCN ceramics, doped with the transition metal ions exhibiting superparamagnetic features are promising in building high-temperature magnetic and pressure sensors. EPR (electron paramagnetic resonance) and FMR (ferromagnetic resonance) techniques can provide important information on the properties of SiCN and its magnetic derivatives, in conjunction with structural, magnetic and electric measurements. In the present work, EPR signals due to sp2–hybridized carbon-related dangling bonds were recorded over the 4 - 300 K range. SiCN ceramics consist of nanoparticles of SiCN and a free carbon phase. The two EPR signals, which were only resolved at the higher frequencies of W (95 GHz) and G (170 GHz) bands are due to carbon-related dangling bonds present as (i) defects on the freecarbon phase and (ii) within the bulk of SiCN ceramic network. SiCN magnetic ceramics, doped with the Fe ions were synthesized at different pyrolysis temperatures in the range 600° - 1600°C. Several magnetic phases in SiCN/Fe composite are detected by EPR/FMR technique. The main sources of magnetism in these samples are: (i) superparamagnetic nanoparticles of Fe3Si, (TC = 800°C), (ii) nanoparticles of Fe5Si3 (TC = 393°C), which appear above 1000°C in single-domain state and (iii) nanoparticles of Fe70SixC30-x (620°C).


Keywords: Antiferromagnetic interaction, Curie law, Curie temperature, Dangling bonds, EPR, EPR linewidth, Ferromagnetic nanoparticles, FMR, Fluctuations of the magnetization, High-frequency EPR, Multi-frequency EPR, Nanoparticles, Phase-transition, Silicon nitro carbide (SiCN) ceramics, SiCN/Fe ceramics, SiCN/Mn ceramics, Superparamagnetic nanoparticles, Superparamagnetism, Temperature dependence.

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      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Trial Access" as access_base_text, CASE j.type WHEN 111 THEN true ELSE false END as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_trail` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 316381173 and j.to_ip >=316381173 )) and ((j.from_date <= 1740513557 and j.to_date >= 1740513557 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 12250) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Subscribed" as access_base_text, false as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_corporate` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 316381173 and j.to_ip >=316381173 )) and ((j.from_date <= 1740513557 and j.to_date >= 1740513557 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 12250) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Token Based Access" as access_base_text, false as terms_popup, "R" as content_download_type, j.uc_id as restricted_user_access_key, "v" as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_token` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 316381173 and j.to_ip >=316381173 )) and ((j.from_date <= 1740513557 and j.to_date >= 1740513557 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 12250)
      910μsalphaeurekaselec_live_10_06_2022UserAccess.php#1266
      Backtrace
      • 13. app/Models/UserAccess/UserAccess.php:1266
      • 14. app/Http/Controllers/ChapterController.php:1549
      • 15. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • select b.banner_link, b.banner_name, b.banner_script, b.banner_remarks, b.banner_file_name, b.banner_placement, bd.content_type, bd.content_id from `tbl_banner` as `b` inner join `tbl_banner_detail` as `bd` on `bd`.`banner_id` = `b`.`banner_id` inner join `users` as `u` on `u`.`id` = `b`.`updated_by` where `b`.`banner_ebook` = 1 and `bd`.`content_type` = 'B' and `bd`.`content_id` = 2459 and `b`.`banner_from_date` <= 1740513557 and `b`.`banner_to_date` >= 1740513557 and `b`.`banner_status` = 'A' order by `b`.`banner_id` desc
      1.52msalphaeurekaselec_live_10_06_2022Banner.php#95
      Bindings
      • 0: 1
      • 1: B
      • 2: 2459
      • 3: 1740513557
      • 4: 1740513557
      • 5: A
      Backtrace
      • 13. app/Models/Banner.php:95
      • 14. app/Http/helpers.php:404
      • 17. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 18. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    • select count(*) as aggregate from `uc_cart_products` where cart_id='082e371b3fdd1912cea194472ea0574c'
      310μsalphaeurekaselec_live_10_06_2022Cart.php#271
      Backtrace
      • 15. app/Models/Cart.php:271
      • 16. view::layouts._header:260
      • 18. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 20. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    App\Models\Keywords
    19Keywords.php#?
    App\Models\Chapter
    1Chapter.php#?
    App\Models\Ebook
    1Ebook.php#?
        _token
        hBRnvVg9mVn0q0Hsv7nQA4XKlQZUpoh9hDLL8xCO
        uc_cart_id
        082e371b3fdd1912cea194472ea0574c
        _previous
        array:1 [ "url" => "http://alpha.eurekaselect.com/chapter/12250" ]
        _flash
        array:2 [ "old" => [] "new" => [] ]
        PHPDEBUGBAR_STACK_DATA
        []
        path_info
        /chapter/12250
        status_code
        200
        
        status_text
        OK
        format
        html
        content_type
        text/html; charset=UTF-8
        request_query
        []
        
        request_request
        []
        
        request_headers
        0 of 0
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        request_cookies
        0 of 0
        array:1 [ "wayfindertarget" => null ]
        response_headers
        0 of 0
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        session_attributes
        0 of 0
        array:5 [ "_token" => "hBRnvVg9mVn0q0Hsv7nQA4XKlQZUpoh9hDLL8xCO" "uc_cart_id" => "082e371b3fdd1912cea194472ea0574c" "_previous" => array:1 [ "url" => "http://alpha.eurekaselect.com/chapter/12250" ] "_flash" => array:2 [ "old" => [] "new" => [] ] "PHPDEBUGBAR_STACK_DATA" => [] ]
        ClearShow all
        Date ↕MethodURLData
        #12025-02-25 19:59:17GET/chapter/122501121921