{"id":173,"date":"2019-04-03T00:56:25","date_gmt":"2019-04-02T15:56:25","guid":{"rendered":"https:\/\/www.shinkosha.com\/?page_id=173"},"modified":"2025-07-31T15:33:05","modified_gmt":"2025-07-31T06:33:05","slug":"al2o3","status":"publish","type":"page","link":"https:\/\/www.shinkosha.com\/english\/product\/epi_substrate\/al2o3\/","title":{"rendered":"Sapphire"},"content":{"rendered":"<h1 class=\"component-heading is-level-01\">Sapphire<small>Al2O3<\/small><\/h1>\n<p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-272\" src=\"https:\/\/www.shinkosha.com\/wp-content\/uploads\/2019\/04\/Al2O3_1.jpg\" alt=\"\" width=\"300\" height=\"201\" \/><\/p>\n<p class=\"component-text is-lead\" style=\"text-align: center\"><span>We provide the most suitable sapphire substrates for epitaxial thin-film growth of group III nitride semiconductor, superconductor, and dielectrics.<\/span><br class=\"utility-visibility-lg\" \/><span>Our sapphire substrate is made by in-house integrated production system starting from crystal growth (by our original <a href=\"https:\/\/www.shinkosha.com\/english\/techinfo\/crystal-growth\/en_tsmg-method\/\" target=\"_blank\" rel=\"noopener\">TSMG method<\/a>) to the surface polishing.<\/span><\/p>\n<p class=\"component-text is-lead\"><span>The quality of crystallinity, surface processing, and the cleaning and packaging have been highly evaluated by our customers both at home and abroad.<\/span><\/p>\n<h3><span>Characteristics<\/span><\/h3>\n<table class=\"component-table\" width=\"1012\">\n<tbody>\n<tr>\n<th style=\"width: 271.989px\"><span>Composition<\/span><\/th>\n<td style=\"text-align: center;width: 957.279px\">Al<sub>2<\/sub>O<sub>3<\/sub><\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Crystal system<\/span><\/th>\n<td style=\"text-align: center;width: 957.279px\"><span>Trigonal (Rhombohedral)<\/span><\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Crystal structure<\/span><\/th>\n<td style=\"text-align: center;width: 957.279px\"><span>Corundum<\/span><\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Lattice constant<\/span>(nm)<\/th>\n<td style=\"text-align: center;width: 957.279px\">a=0.47588, c=1.2992 \uff08<span>As hexagonal<\/span><sup>\u203b<\/sup>\uff09<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Melting point<\/span>(\u2103\uff09<\/th>\n<td style=\"text-align: center;width: 957.279px\">2040<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Density<\/span>(g\/cm<sup>3<\/sup>)<\/th>\n<td style=\"text-align: center;width: 957.279px\">3.987<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Crystal growth method<\/span><\/th>\n<td style=\"text-align: center;width: 957.279px\"><a href=\"https:\/\/www.shinkosha.com\/english\/techinfo\/crystal-growth\/en_tsmg-method\/\" target=\"_blank\" rel=\"noopener\"><span>TSMG method<\/span><\/a><\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Dielectric constant<\/span><\/th>\n<td style=\"text-align: center;width: 957.279px\">(\/\/c<span>-axis<\/span>\uff09 9.41 at 30 GHz<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Dielectric loss<\/span><\/th>\n<td style=\"text-align: center;width: 957.279px\">(\/\/<i><i>c<\/i><\/i><i><span>-axis<\/span><\/i>)\u30003\u00d710<sup>-5<\/sup> at 30 GHz<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 271.989px\"><span>Linear expansion coefficient<\/span>(10<sup>-6<\/sup>\/\u2103)<\/th>\n<td style=\"text-align: center;width: 957.279px\">\n<p><i><i>a<\/i><\/i><i><span>-axis<\/span><\/i>\uff1a6.93, <i><i>c<\/i><\/i><i><span>-axis<\/span><\/i>\uff1a7.63 at 200 \u2103<\/p>\n<p><i><i>a<\/i><\/i><i><span>-axis<\/span><\/i>\uff1a8.89, <i><i>c<\/i><\/i><i><span>-axis<\/span><\/i>\uff1a9.97 at 1000 \u2103<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u203b<span>The precise system is trigonal (a=0.513 nm, \u03b1=55.1 \u00b0), but it is generally treated as hexagonal.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-275 aligncenter\" src=\"https:\/\/www.shinkosha.com\/wp-content\/uploads\/2019\/04\/Al2O3_2.jpg\" alt=\"\" width=\"336\" height=\"237\" \/><span>\u3000\u3000\u3000X-ray rocking curve of sapphire crystal<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\">Transmittance of Sapphire<\/p>\n<p><a href=\"https:\/\/www.shinkosha.com\/english\/techinfo\/en_transmittance\/en_transmittance_sapphire\/\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/transmittance-sap.jpg\" alt=\"\" width=\"989\" height=\"371\" class=\"wp-image-1286 aligncenter\" srcset=\"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/transmittance-sap.jpg 1772w, https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/transmittance-sap-300x113.jpg 300w, https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/transmittance-sap-768x288.jpg 768w, https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/transmittance-sap-1024x384.jpg 1024w\" sizes=\"auto, (max-width: 989px) 100vw, 989px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><span style=\"font-size: 18pt;color: #0000ff\"><a href=\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/\" style=\"color: #0000ff\"><strong>\uff0a Details of Sapphire Properties<\/strong><\/a><\/span><\/p>\n<h3><span>Standard specs<\/span><\/h3>\n<table class=\"component-table-thead\" style=\"width: 941px\">\n<tbody>\n<tr>\n<th style=\"width: 470.708px\"><span>Size (mm)<br \/>(Tolerance)<\/span><\/th>\n<td style=\"width: 467.078px;text-align: center\">\n<p>10\u00d710 (\u00b10.1),\u00a0 \u00a015\u00d715 (\u00b10.1)<\/p>\n<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 470.708px\"><span>Thickness (mm) <br \/>(Tolerance\u00b10.05)<\/span><\/th>\n<td style=\"width: 467.078px;text-align: center\">0.5<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 470.708px\"><span>Flatness<\/span>(\u03bcm)<\/th>\n<td style=\"width: 467.078px;text-align: center\">&lt;1<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 470.708px\"><span>Purity<\/span>(%)<\/th>\n<td style=\"width: 467.078px;text-align: center\">&gt;99.99<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 470.708px\"><span>Orientation<br \/>(Tolerance: \u00b10.5\u00b0)<\/span><\/th>\n<td style=\"width: 467.078px;text-align: center\">c(0001)<br \/>r(01-12)<br \/>a(11-20)<br \/>m(10-10)<\/td>\n<\/tr>\n<tr>\n<th style=\"width: 470.708px\"><span>Polishing<\/span><\/th>\n<td style=\"width: 467.078px;text-align: center\"><span>One-side \/ Both-side<\/span><\/td>\n<\/tr>\n<tr>\n<th style=\"width: 470.708px\"><span>Packaging unit<\/span><\/th>\n<td style=\"width: 467.078px;text-align: center\">10<span>pcs<\/span><\/td>\n<\/tr>\n<tr>\n<th style=\"width: 470.708px\"><span>Options<\/span><\/th>\n<td style=\"width: 467.078px;text-align: center\"><a href=\"https:\/\/www.shinkosha.com\/english\/product\/epi_substrate\/epi_substrate_10\/\">STEP substrate<\/a><br \/>OFF substrate<br \/><a href=\"https:\/\/www.shinkosha.com\/english\/product\/epi_substrate\/epi_substrate_12\/\">Breakable substrate<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span>\u203bIf you are looking for other specs, please contact us.<\/span><br \/><span><br \/><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SapphireAl2O3 We provide the most suitable sapphire substrates for epitaxial thin-film growth of group III nitride semiconductor, superconductor, and dielectrics.Our sapphire substrate is made by in-house integrated production system starting from crystal growth (by our original TSMG method) to the surface polishing. The quality of crystallinity, surface processing, and the cleaning and packaging have been [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":676,"parent":612,"menu_order":14,"comment_status":"closed","ping_status":"closed","template":"page-template-product-child.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-173","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Sapphire - SHINKOSHA Crystals for a bright future<\/title>\n<meta name=\"description\" content=\"Shinkosha is a leading company of oxide single crystal production. 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