{"id":620,"date":"2024-06-01T07:54:44","date_gmt":"2024-05-31T23:54:44","guid":{"rendered":"https:\/\/artehistoria.net\/?p=620"},"modified":"2024-06-01T07:54:44","modified_gmt":"2024-05-31T23:54:44","slug":"heat-capacity-of-alumina","status":"publish","type":"post","link":"https:\/\/artehistoria.net\/cs\/tepelna-kapacita-oxidu-hliniteho\/","title":{"rendered":"Tepeln\u00e1 kapacita oxidu hlinit\u00e9ho"},"content":{"rendered":"<p>Tepeln\u00e1 kapacita ozna\u010duje energii pot\u0159ebnou ke zv\u00fd\u0161en\u00ed teploty l\u00e1tky o jeden stupe\u0148 Celsia a m\u011b\u0159\u00ed se v joulech na kilogram materi\u00e1lu.<\/p>\n<p>Spole\u010dnost CoorsTek nab\u00edz\u00ed \u0159adu v\u00fdrobk\u016f z oxidu hlinit\u00e9ho s v\u00fdjime\u010dnou odolnost\u00ed proti tepeln\u00fdm \u0161ok\u016fm. Macor je pokro\u010dil\u00fd materi\u00e1l, kter\u00fd nab\u00edz\u00ed vynikaj\u00edc\u00ed v\u00fdkon p\u0159i vy\u0161\u0161\u00edch teplot\u00e1ch.<\/p>\n<h2>Teplota<\/h2>\n<p>Tepeln\u00e1 kapacita ozna\u010duje energii pot\u0159ebnou ke zv\u00fd\u0161en\u00ed teploty l\u00e1tky o jeden stupe\u0148 Celsia a lze ji tak\u00e9 vyj\u00e1d\u0159it jako m\u011brnou tepelnou kapacitu nebo energii na jednotku hmotnosti l\u00e1tky. Kovy maj\u00ed obvykle vy\u0161\u0161\u00ed m\u011brnou tepelnou kapacitu ne\u017e polymery nebo keramika a obvykle se vyzna\u010duj\u00ed velk\u00fdmi body t\u00e1n\u00ed s minim\u00e1ln\u00ed tepelnou rozta\u017enost\u00ed - tyto vlastnosti je p\u0159edur\u010duj\u00ed k mnoha pr\u016fmyslov\u00fdm pou\u017eit\u00edm.<\/p>\n<p>Hlin\u00edk m\u00e1 p\u0159ibli\u017en\u00e9 m\u011brn\u00e9 teplo p\u0159ibli\u017en\u011b 900 J\/kg C, co\u017e je vy\u0161\u0161\u00ed hodnota ne\u017e u mnoha kov\u016f, jako je m\u011b\u010f a st\u0159\u00edbro, a to d\u00edky hust\u011b uspo\u0159\u00e1dan\u00fdm atom\u016fm, kter\u00e9 usnad\u0148uj\u00ed veden\u00ed. Na druhou stranu je jeho m\u011brn\u00e9 teplo ni\u017e\u0161\u00ed ne\u017e u mnoha miner\u00e1l\u016f, jako je p\u00edsek nebo v\u00e1penec, proto\u017ee jejich m\u00e9n\u011b zabalen\u00e9 atomy zt\u011b\u017euj\u00ed p\u0159enos tepla.<\/p>\n<p>Hlin\u00edk je izolant a m\u016f\u017ee pomoci sn\u00ed\u017eit teplotu v jak\u00e9mkoli pracovn\u00edm prostoru, av\u0161ak pro bezpe\u010dn\u00e9 pou\u017eit\u00ed je t\u0159eba s n\u00edm zach\u00e1zet opatrn\u011b a s p\u0159\u00edslu\u0161n\u00fdm vybaven\u00edm a bezpe\u010dnostn\u00edmi opat\u0159en\u00edmi. P\u0159i jeho um\u00edst\u011bn\u00ed v bl\u00edzkosti hork\u00fdch povrch\u016f je t\u0159eba jej dr\u017eet v dostate\u010dn\u00e9 vzd\u00e1lenosti, aby byli u\u017eivatel\u00e9 chr\u00e1n\u011bni, a nikdy se nesm\u00ed dot\u00fdkat \u017e\u00e1dn\u00e9ho zapnut\u00e9ho topn\u00e9ho prvku; v p\u0159\u00edpad\u011b pop\u00e1len\u00ed poko\u017eky by m\u011blo doj\u00edt k okam\u017eit\u00e9mu opl\u00e1chnut\u00ed za pou\u017eit\u00ed studen\u00e9 vody, kter\u00e1 pom\u00e1h\u00e1 zklidnit posti\u017een\u00e1 m\u00edsta.<\/p>\n<p>M\u011brn\u00e9 teplo oxidu hlinit\u00e9ho ovliv\u0148uje \u0159ada faktor\u016f, v\u010detn\u011b pod\u00edlu f\u00e1ze g a p\u00f3rovitosti. S rostouc\u00ed teplotou jeho m\u011brn\u00e9 teplo kles\u00e1, co\u017e vede ke sn\u00ed\u017een\u00ed tepeln\u00e9 vodivosti a difuzivity v d\u016fsledku f\u00e1zov\u00e9 p\u0159em\u011bny mezi f\u00e1zemi a a g.<\/p>\n<p>Proto\u017ee m\u011brn\u00e9 teplo oxidu hlinit\u00e9ho z\u00e1vis\u00ed na teplot\u011b kalcinace, provedlo n\u011bkolik v\u00fdzkumn\u00fdch skupin studie zahrnuj\u00edc\u00ed vzorky kalcinovan\u00e9 p\u0159i r\u016fzn\u00fdch teplot\u00e1ch, aby zjistily, jak teplota ovliv\u0148uje jeho tepeln\u00e9 vlastnosti a v kone\u010dn\u00e9m d\u016fsledku m\u011brn\u00e9 teplo oxidu hlinit\u00e9ho a dal\u0161\u00ed termodynamick\u00e9 parametry. V d\u016fsledku toho n\u011bkolik v\u00fdzkumn\u00fdch skupin provedlo rozs\u00e1hl\u00e9 v\u00fdzkumy vzork\u016f kalcinovan\u00fdch p\u0159i r\u016fzn\u00fdch teplot\u00e1ch, aby l\u00e9pe pochopily jejich vliv na tepeln\u00e9 vlastnosti a m\u011brn\u00e9 teplo. To vedlo k lep\u0161\u00edmu pochopen\u00ed vlivu teploty na m\u011brn\u00e9 teplo a dal\u0161\u00ed termodynamick\u00e9 parametry m\u011brn\u00e9ho tepla a dal\u0161\u00edch termodynamick\u00fdch parametr\u016f obecn\u011b.<\/p>\n<h2>Tlak<\/h2>\n<p>Oxid hlinit\u00fd (Al2O3) je technick\u00fd keramick\u00fd materi\u00e1l, kter\u00fd se hojn\u011b vyu\u017e\u00edv\u00e1 d\u00edky sv\u00fdm vynikaj\u00edc\u00edm vlastnostem za p\u0159ijatelnou cenu. Hlin\u00edk se vyzna\u010duje vynikaj\u00edc\u00ed mechanickou pevnost\u00ed, pevnost\u00ed v tlaku, tvrdost\u00ed, odolnost\u00ed proti korozi a opot\u0159eben\u00ed a n\u00edzkou tepelnou rozta\u017enost\u00ed; nav\u00edc je chemicky inertn\u00ed a biokompatibiln\u00ed a m\u00e1 rovn\u011b\u017e n\u00edzkou tepelnou rozta\u017enost. M\u011brn\u00e1 tepeln\u00e1 kapacita oxidu hlinit\u00e9ho znamen\u00e1, \u017ee absorbuje velk\u00e9 mno\u017estv\u00ed energie p\u0159i jak\u00e9koli teplot\u011b; nav\u00edc m\u00e1 pom\u011brn\u011b vysokou tepelnou vodivost 30-35 W\/mK, co\u017e jej \u010din\u00ed vhodn\u00fdm pro mnohostrann\u00e9 pou\u017eit\u00ed v pr\u016fmyslu.<\/p>\n<p>M\u011brn\u00e1 tepeln\u00e1 kapacita oxidu hlinit\u00e9ho z\u00e1vis\u00ed na jeho teplot\u011b, tlaku a po\u010dtu atom\u016f na jednotku objemu. Vzorec pro jeho m\u011brnou tepelnou kapacitu lze vyj\u00e1d\u0159it jako Cp = H\/N, kde H je latentn\u00ed v\u00fdparn\u00e9 teplo, N je po\u010det atom\u016f ve vzorku a T jeho teplota; pomoc\u00ed tohoto p\u0159\u00edstupu Debye\u016fv model odhaduje jeho m\u011brn\u00e9 teplo p\u0159i konstantn\u00edm objemu a teplot\u011b.<\/p>\n<p>V porovn\u00e1n\u00ed s hexagon\u00e1ln\u00edm ledem m\u00e1 oxid hlinit\u00fd ni\u017e\u0161\u00ed schopnost absorbovat vodu p\u0159i vy\u0161\u0161\u00edch teplot\u00e1ch, co\u017e je zp\u016fsobeno drsn\u011bj\u0161\u00edm povrchem a v\u011bt\u0161\u00edmi interstici\u00e1ln\u00edmi prostory na jeho iontech ne\u017e na iontech hexagon\u00e1ln\u00edho ledu, kter\u00fdm trv\u00e1 d\u00e9le, ne\u017e difunduj\u00ed z jeho nitra na povrch a pak zp\u011bt. P\u0159i teplot\u00e1ch ni\u017e\u0161\u00edch, ne\u017e je teplota rozkladu oxidu hlinit\u00e9ho, se v\u0161ak voda m\u016f\u017ee rychle vst\u0159eb\u00e1vat do jeho p\u00f3r\u016f.<\/p>\n<p>Pro stanoven\u00ed m\u011brn\u00e9 tepeln\u00e9 kapacity oxidu hlinit\u00e9ho je nejlep\u0161\u00ed pou\u017e\u00edt elektrick\u00fd ponorn\u00fd oh\u0159\u00edva\u010d. Za t\u00edmto \u00fa\u010delem um\u00edst\u011bte teplom\u011br do st\u0159edov\u00e9ho otvoru bloku, p\u0159ipojte jej k amp\u00e9rmetru a voltmetru, zapn\u011bte oh\u0159\u00edva\u010d, nechte jej oh\u0159\u00edvat blok po dobu 10 minut, zm\u011b\u0159te jeho teplotu a v\u00fdsledky zaznamenejte; k v\u00fdpo\u010dtu m\u011brn\u00e9 tepeln\u00e9 kapacity materi\u00e1lu pou\u017eijte rovnici Cp = H\/N.<\/p>\n<p>P\u0159\u00eddavek nano\u010d\u00e1stic m\u016f\u017ee zv\u00fd\u0161it tepelnou vodivost kapalin, ale zat\u00edm nebylo dosa\u017eeno shody ohledn\u011b jejich vlivu na m\u011brnou tepelnou kapacitu. In\u017een\u00fd\u0159i by proto m\u011bli studovat, jak se m\u011bn\u00ed m\u011brn\u00e1 tepeln\u00e1 kapacita oxidu hlinit\u00e9ho v z\u00e1vislosti na teplot\u011b, aby mohli navrhovat syst\u00e9my, kter\u00e9 funguj\u00ed efektivn\u011b za r\u016fzn\u00fdch okolnost\u00ed a sni\u017euj\u00ed rizika teplotn\u00edho gradientu v aplikac\u00edch chlazen\u00ed\/oh\u0159evu.<\/p>\n<h2>P\u00f3rovitost<\/h2>\n<p>Hlin\u00edk je keramick\u00fd materi\u00e1l s vysokou m\u011brnou tepelnou kapacitou. D\u00edky sv\u00e9 chemick\u00e9 a tepeln\u00e9 stabilit\u011b se s oblibou pou\u017e\u00edv\u00e1 v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch, zat\u00edmco jeho odolnost v\u016f\u010di mnoha chemik\u00e1li\u00edm a \u010dinidl\u016fm jej \u010din\u00ed odoln\u00fdm. Hlin\u00edk se tak\u00e9 m\u016f\u017ee pochlubit vynikaj\u00edc\u00ed tepelnou vodivost\u00ed, d\u00edky n\u00ed\u017e je vhodn\u00fd pro izola\u010dn\u00ed aplikace; jeho vodivost z\u00e1vis\u00ed na mikrostruktu\u0159e a faktorech p\u00f3rovitosti, proto\u017ee velk\u00e1 \u010d\u00e1st f\u00e1ze g s ni\u017e\u0161\u00ed p\u00f3rovitost\u00ed m\u00e1 vy\u0161\u0161\u00ed m\u011brnou tepelnou kapacitu ne\u017e ostatn\u00ed; v d\u016fsledku toho je nezbytn\u00e9 p\u0159ed pou\u017eit\u00edm v jak\u00e9koli aplikaci nebo projektu ur\u010dit teplotu jeho slinov\u00e1n\u00ed.<\/p>\n<p>Povlaky oxidu hlinit\u00e9ho st\u0159\u00edkan\u00e9 vzduchem (APS) jsou v\u0161eobecn\u011b uzn\u00e1van\u00e9 pro svou odolnost v\u016f\u010di n\u00edzkoteplotn\u00edm tepeln\u00fdm cykl\u016fm, av\u0161ak kv\u016fli sv\u00e9 slo\u017eit\u00e9 struktu\u0159e a drsnosti rozhran\u00ed jsou n\u00e1chyln\u00e9 k delaminaci a \u0161\u00ed\u0159en\u00ed trhlin. Tyto aspekty byly zkoum\u00e1ny v mnoha studi\u00edch, v\u011bt\u0161ina z nich se v\u0161ak zam\u011b\u0159ila na ploch\u00e9 vzorky nebo matematicky modelovan\u00e9 drsnosti, nikoli na skute\u010dnou morfologii povlaku.<\/p>\n<p>Tato studie zkoum\u00e1 vliv r\u016fzn\u00fdch teplot sp\u00e9k\u00e1n\u00ed na m\u011brnou tepelnou kapacitu a tepelnou vodivost dvou komer\u010dn\u00edch druh\u016f oxidu hlinit\u00e9ho s prom\u011bnlivou objemovou hmotnost\u00ed, p\u0159i\u010dem\u017e jako p\u0159\u00edpadov\u00e9 studie pou\u017e\u00edv\u00e1 dva komer\u010dn\u00ed druhy. V\u00fdsledky charakterizace ukazuj\u00ed siln\u00fd vztah mezi kapacitou pro ukl\u00e1d\u00e1n\u00ed energie a obsahem frakce f\u00e1ze g vedle p\u00f3rovitosti pro zv\u00fd\u0161en\u00ed kapacity pro ukl\u00e1d\u00e1n\u00ed energie a mechanick\u00fdch vlastnost\u00ed oxidu hlinit\u00e9ho.<\/p>\n<p>P\u0159i teplot\u011b 900 stup\u0148\u016f C byly testov\u00e1ny vzorky oxidu hlinit\u00e9ho s r\u016fzn\u00fdm pom\u011brem a hustotou g-f\u00e1z\u00ed a p\u00f3rovitost\u00ed, aby se vyhodnotila jejich v\u00fdkonnost. Vzorky s vy\u0161\u0161\u00edm pod\u00edlem g-f\u00e1z\u00ed a ni\u017e\u0161\u00ed p\u00f3rovitost\u00ed vykazovaly ni\u017e\u0161\u00ed hmotnostn\u00ed m\u011brn\u00e9 tepeln\u00e9 kapacity i tepelnou vodivost ne\u017e vzorky s men\u0161\u00edm pod\u00edlem g-f\u00e1z\u00ed a vy\u0161\u0161\u00ed p\u00f3rovitost\u00ed.<\/p>\n<p>C\u00edlem t\u00e9to studie bylo vytvo\u0159it vysoce por\u00e9zn\u00ed oxid hlinit\u00fd pomoc\u00ed metody gelov\u00e1n\u00ed suspenze (GS). V\u00fdsledky uk\u00e1zaly, \u017ee vyroben\u00e9 p\u011bny oxidu hlinit\u00e9ho m\u011bly pr\u016fm\u011brnou velikost p\u00f3r\u016f 1,2 mm, p\u0159esto\u017ee se jednalo o uzav\u0159en\u00e9 bu\u0148ky; fotografie bun\u011b\u010dn\u00e9 struktury pro r\u016fzn\u00e9 objemov\u00e9 hustoty jsou uvedeny na obr. 4. Pro zji\u0161t\u011bn\u00ed t\u00e9to pr\u016fm\u011brn\u00e9 velikosti p\u00f3r\u016f byla v r\u00e1mci jejich stanoven\u00ed provedena m\u011b\u0159en\u00ed tlou\u0161\u0165ky a pr\u016fm\u011bru st\u011bny.<\/p>\n<h2>Reaktivita<\/h2>\n<p>Oxid hlinit\u00fd (ozna\u010dovan\u00fd tak\u00e9 jako aluminia) je oxidov\u00e1 keramika s vynikaj\u00edc\u00edmi elektroizola\u010dn\u00edmi a mechanick\u00fdmi vlastnostmi, jako je tvrdost a odolnost proti opot\u0159eben\u00ed, spolu s relativn\u011b vysokou tepelnou vodivost\u00ed pro technickou keramiku. K dispozici je \u0159ada velikost\u00ed a tvar\u016f \u010d\u00e1stic, co\u017e umo\u017e\u0148uje vytv\u00e1\u0159et z n\u011bj odl\u00e9vac\u00ed materi\u00e1ly, \u017e\u00e1ruvzdorn\u00e9 materi\u00e1ly a extrudovan\u00e9 v\u00fdrobky. Hlin\u00edk se tak\u00e9 m\u016f\u017ee pochlubit siln\u00fdmi korozivzdorn\u00fdmi vlastnostmi a je velmi tvrd\u00fd; d\u00edky tomu se s oblibou pou\u017e\u00edv\u00e1 p\u0159i v\u00fdrob\u011b kovov\u00e9ho hlin\u00edku nebo jako brusn\u00fd materi\u00e1l, krom\u011b toho, \u017ee se vyu\u017e\u00edv\u00e1 pro pou\u017eit\u00ed p\u0159i v\u00fdrob\u011b kovov\u00e9ho hlin\u00edku nebo pro pou\u017eit\u00ed v keramick\u00fdch aplikac\u00edch, jako je v\u00fdroba kovov\u00e9ho hlin\u00edku nebo v\u00fdrobn\u00ed aplikace, jako je tomu jinde v keramick\u00fdch aplikac\u00edch, jako je v\u00fdroba hlin\u00edku.<\/p>\n<p>Reaktivita tepeln\u00e9 kapacity oxidu hlinit\u00e9ho je d\u00e1na chemick\u00fdm slo\u017een\u00edm jeho povrchu a p\u0159\u00edtomnost\u00ed defekt\u016f nebo dislokac\u00ed, nap\u0159. dislokac\u00ed. Reaktivitu lze definovat jako jeho schopnost uvol\u0148ovat ionty nebo elektrony prost\u0159ednictv\u00edm oxida\u010dn\u00edch reakc\u00ed; oxid hlinit\u00fd je vysoce reaktivn\u00ed, ale tato reaktivita je omezena d\u00edky ochrann\u00e9 pasivn\u00ed vrstv\u011b oxidu, kter\u00e1 jej obklopuje a kter\u00e1 br\u00e1n\u00ed p\u0159\u00edm\u00e9 reakci s okoln\u00edm kysl\u00edkem; to umo\u017e\u0148uje p\u0159em\u011bnu tepeln\u011b kapacitn\u00edho oxidu hlinit\u00e9ho na kovov\u00fd hlin\u00edk prost\u0159ednictv\u00edm Hall-Heroultova procesu.<\/p>\n<p>D\u00edky sv\u00fdm schopnostem uvol\u0148ovat energii p\u0159i oxida\u010dn\u00edch reakc\u00edch m\u016f\u017ee oxid hlinit\u00fd slou\u017eit jako vynikaj\u00edc\u00ed energetick\u00fd materi\u00e1l v tuh\u00fdch palivech a pohonn\u00fdch hmot\u00e1ch. Pro dal\u0161\u00ed zv\u00fd\u0161en\u00ed jeho reaktivity mus\u00ed nejprve doj\u00edt k p\u0159edb\u011b\u017en\u00e9 aktivaci organick\u00fdmi nebo anorganick\u00fdmi slou\u010deninami, aby tento materi\u00e1l fungoval optim\u00e1ln\u011b. Reaktivitu lze tak\u00e9 zv\u00fd\u0161it \u00fapravou kysel\u00fdmi nebo z\u00e1sadit\u00fdmi roztoky; kysel\u00e9 roztoky maj\u00ed tendenci vytv\u00e1\u0159et reaktivn\u011bj\u0161\u00ed materi\u00e1ly, zat\u00edmco z\u00e1sadit\u00e9 \u00fapravy maj\u00ed tendenci \u010dinit oxid hlinit\u00fd stabiln\u011bj\u0161\u00edm a m\u00e9n\u011b reaktivn\u00edm.<\/p>\n<p>P\u0159\u00eddavek dus\u00edku m\u016f\u017ee d\u00e1le zv\u00fd\u0161it reaktivitu oxidu hlinit\u00e9ho, zajistit mu zv\u00fd\u0161enou stabilitu oxid\u016f a sn\u00ed\u017eit rychlost uvol\u0148ov\u00e1n\u00ed iont\u016f z n\u011bj. Tyto vlastnosti jsou zvl\u00e1\u0161t\u011b cenn\u00e9 p\u0159i pou\u017eit\u00ed jako substr\u00e1t pro integrovan\u00e9 obvody a supravodiv\u00e1 za\u0159\u00edzen\u00ed, jako jsou jednoelektronov\u00e9 tranzistory a kvantov\u00e1 interferen\u010dn\u00ed za\u0159\u00edzen\u00ed. Alternativn\u011b lze jeho reaktivitu zv\u00fd\u0161it tak\u00e9 vytvo\u0159en\u00edm kompozitn\u00edho cermetu oxidu hlinit\u00e9ho a chromu, kter\u00fd se pou\u017e\u00edv\u00e1 jako materi\u00e1l pro oblo\u017een\u00ed st\u011bn v za\u0159\u00edzen\u00edch CSP, a to jak d\u00edky odolnosti proti te\u010den\u00ed a hou\u017eevnatosti, tak d\u00edky vysok\u00e9 reaktivit\u011b z obou prvk\u016f.<\/p>","protected":false},"excerpt":{"rendered":"<p>Heat capacity refers to the energy required to raise a substance&#8217;s temperature by one degree Celsius and is measured in [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"class_list":["post-620","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/620","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/comments?post=620"}],"version-history":[{"count":1,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/620\/revisions"}],"predecessor-version":[{"id":621,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/620\/revisions\/621"}],"wp:attachment":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/media?parent=620"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/categories?post=620"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/tags?post=620"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}