Platina (lot. platinum), tug’ma PLA- Tina \u2014 platinali minerallar guruhi, metallar (asosan, temir)ning platina b-n tabiiy qattiq qorishma-si. P.dastlab 1803 y.datopilgan (nomi ispancha piatinas\u2014 kumush). Bu guruh mi-nerallarning asosiylari: poliksen, palladiyli P., ferroplatina (tug’ma qotishma), sper- rilit, kuperit, breggit. P. kumush kabi oq, yaltiroq, bolg’alanuvchan, cho’ziluvchan metall. Tug’ma P. strukturasida platina erituvchi me-talldir. P. minerallari- ning tarkibi: tug’ma P. (80%dan ortiq Pt), temirli P. (20-50% G’e), izofer- roplatina (Pt3Fe), tetraferroplatina (PtFe), iridiyli P. (10,4\u201437,5% Ir), palladiyli P. (19,4-40,0% Pd), pal- ladiyli stannoplatina (16-23% Sn, 17,2\u2014 20,9% Pd). Minerallar, asosan, kub singoniyada kristallanadi. Temir- li qorishmalar ko’pincha magnit xossaga ega. Kdgtikligi 3,5 dan (mis va nikel tarkibli minerallar) 5,5 gacha (iridiy- li minerallar). Zichligi 13100\u2014 21500 kg\/m3. Barcha minerallar yaxshi elektr o’tkazgich, donacha va kristallarining kattaligi bir necha mm gacha, ayrim hollarda o’nlab sm gacha, og’irligi 1-5 g dan bir necha kg gacha. Eng katta tug’ma P. Rossiyaning Ural tog’laridagi dunit- larda (427,5 g) va allyu-Vial sochmalarda (9635 g) topilgan. P. korroziya va yuqori t-raga chidamliligi, bosim b-n ishlov berish osonligi tufayli texnikaning turli sohasi (elektr — va radiotexnika) da qo’llaniladi; neftdan yuqori sifat- li yoqilg’i i.ch.da katalizator sifatida ishlatiladi, shisha va kvars tolalar i.ch. uchun P.ning rodiyli krtishmasidan Max- sus asboblar, zargarlik buyumlari tayyor- lanadi. (yana q. Platina rudalari).<\/p>\n","protected":false},"excerpt":{"rendered":"
Platina (lot. platinum), tug’ma PLA- Tina \u2014 platinali minerallar guruhi, metallar (asosan, temir)ning platina b-n tabiiy qattiq qorishma-si. P.dastlab 1803 y.datopilgan (nomi ispancha piatinas\u2014 kumush). Bu guruh mi-nerallarning asosiylari: poliksen, … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":99837,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[226],"tags":[],"class_list":["post-118982","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-p-harfi","entry"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"ru","enabled_languages":["uz","kr","ru"],"languages":{"uz":{"title":true,"content":true,"excerpt":false},"kr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/posts\/118982","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/comments?post=118982"}],"version-history":[{"count":1,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/posts\/118982\/revisions"}],"predecessor-version":[{"id":118983,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/posts\/118982\/revisions\/118983"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/media\/99837"}],"wp:attachment":[{"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/media?parent=118982"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/categories?post=118982"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/tags?post=118982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}