{"id":1049,"date":"2021-06-03T11:33:47","date_gmt":"2021-06-03T02:33:47","guid":{"rendered":"https:\/\/www.shinkosha.com\/english\/?page_id=1049"},"modified":"2021-08-10T11:19:56","modified_gmt":"2021-08-10T02:19:56","slug":"feature","status":"publish","type":"page","link":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/","title":{"rendered":"Properties of Sapphire"},"content":{"rendered":"

Sapphire has excellent optical, thermal, mechanical, and electrical properties, and is a material used in a variety of fields. The recent increase in the size of sapphire crystals has led to an increase in the number of applications for applying sapphire, and the replacement and improvement from other materials is progressing.<\/span><\/p>\n

\n

Physical Properties<\/a><\/h2>\n
\n\n\n\n\n\n
Formula<\/th>\n\n

\u03b1-Al2<\/sub>O3<\/sub> (Corundum)<\/p>\n<\/td>\n<\/tr>\n

System<\/th>\n\n

Trigonal (R-3c)<\/p>\n

It is generally treated as a hexagonal.<\/span><\/p>\n<\/td>\n<\/tr>\n

Lattice constant<\/th>\n\n

a = 0.47588nm
c = 1.2992nm
Density = 3.987g\/cm3<\/sup>
Melting point = 2040\u2103<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\n

Optical Properties<\/a><\/h2>\n
\n\n\n\n\n
Transmittance<\/th>\n\n

0.23\uff5e5.5\u03bcm\uff08\uff1e50% 5mmt\u00a0 \u00a0Optical-Grade\uff09
0.15\u03bcm\uff5e (\uff1e50% 1mmt\u00a0 \u00a0VUV-Grade)<\/p>\n<\/td>\n<\/tr>\n

Refractive index<\/th>\n\n

no \uff1d 1.7680\u00a0 \u00a0 \u00a0 ne = 1.7598 \uff08at 577nm\uff09<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\n

Thermal Properties<\/a><\/h2>\n
\n\n\n\n\n\n
Thermal conductivity<\/th>\n\n

115W\/m\u30fbK(-120\u2103)
41W\/m\u30fbK(0\u2103)
20W\/m\u30fbK(220\u2103)
13W\/m\u30fbK(500\u2103)<\/p>\n<\/td>\n<\/tr>\n

Specific heat<\/th>\n\n

0.75kJ\/kg\u30fb\u2103<\/p>\n<\/td>\n<\/tr>\n

Thermal expansion<\/th>\n\n

\u3008\u22a5 c-axis<\/span>\u3009
6.9\u00d710-6<\/sup>\/\u2103 (200\u2103)
8.9\u00d710-6<\/sup>\/\u2103 (1000\u2103)<\/p>\n

\u3000\u3000\u3000
\u3008\/\/ c-axis<\/span>\u3009
7.6\u00d710-6<\/sup>\/\u2103 (200\u2103)
10.0\u00d710-6<\/sup>\/\u2103 (1000\u2103)<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\n

Mechanical Properties<\/a> and Elasticity<\/a><\/h2>\n
\n\n\n\n\n\n\n
Bending strength<\/th>\n\n

470MPa (c-plane\u3000Length direction : \/\/a-axis<\/span>)
910MPa (a-plane\u3000 Length direction : \/\/c-axis<\/span>)<\/p>\n<\/td>\n<\/tr>\n

Hardness<\/th>\n\n

\u3008Mohs\u30099 \uff08\u203bDiamond = 10\u00a0 \u00a0 Quartz = 7\uff09
\u3008Vickers\u3009c-plane\uff1a1377\u00a0 \u00a0 \u00a0 \u00a0 a-plane\uff1a1622<\/p>\n<\/td>\n<\/tr>\n

Young\u2019s modulus<\/th>\n\n

425GPa (Stress : \u22a5 c-axis<\/span>)
460GPa (Stress : \/\/c-axis)<\/p>\n<\/td>\n<\/tr>\n

Poisson\u2019s ratio<\/th>\n\n

0.30 (\u22a5c \uff0f \u22a5c)
0.16 (\/\/c \uff0f \u22a5c)
0.18 (\u22a5c \uff0f \/\/c)<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\n

Electrical Properties<\/a><\/h2>\n
\n\n\n\n\n\n\n
Relative permittivity<\/th>\n\n

9.41 (c-axis, 30GHz)<\/p>\n<\/td>\n<\/tr>\n

Loss tangent (tan\u03b4)<\/span><\/th>\n\n

3\u00d710-5<\/sup>\u00a0 (c-axis, 30GHz)<\/p>\n<\/td>\n<\/tr>\n

Resistivity<\/th>\n\n

1011<\/sup>\u03a9cm (500\u2103)
106<\/sup>\u03a9cm (1000\u2103)<\/p>\n<\/td>\n<\/tr>\n

Dielectric strength<\/th>\n\n

480kV\/cm (60Hz)<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\n

Chemical Properties\u00a0<\/a><\/h2>\n
\n

Chemical resistance\uff08 Weight change of sapphire specimen, \u25a125<\/span>\u00d70.5t, after 6 days of immersion<\/span>\uff09<\/p>\n<\/div>\n

\n\n\n\n\n
No change in weight\uff08\u0394 = 0g\uff09<\/th>\n\n

HCl (35%, 20\u2103)
HNO3<\/span> (50%, 20\u2103)
H3<\/span>PO4<\/span> (60%, 100\u2103)
H2<\/span>SO4<\/span> (95%, 100\u2103)
NaOH (30%, 100\u2103)<\/p>\n<\/td>\n<\/tr>\n

Weight change micro<\/th>\n\n

HF (46%, 60\u2103) (\u0394 = 0.0038g\/day)<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Sapphire has excellent optical, thermal, mechanical, and electrical properties, and is a material used in a variety of fields. The recent increase in the size of sapphire crystals has led to an increase in the number of applications for applying sapphire, and the replacement and improvement from other materials is progressing. Physical Properties Formula \u03b1-Al2O3 […]<\/p>\n","protected":false},"author":7,"featured_media":1189,"parent":1098,"menu_order":47,"comment_status":"closed","ping_status":"closed","template":"page-template-techinfo.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-1049","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nProperties of Sapphire - SHINKOSHA Crystals for a bright future<\/title>\n<meta name=\"description\" content=\"Shinkosha is a leading company of oxide single crystal production. We are one of the largest sapphire crystal manufacturer in Japan, and also one of the largest rutile crystal manufacturer in the world.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Properties of Sapphire - SHINKOSHA Crystals for a bright future\" \/>\n<meta property=\"og:description\" content=\"Shinkosha is a leading company of oxide single crystal production. We are one of the largest sapphire crystal manufacturer in Japan, and also one of the largest rutile crystal manufacturer in the world.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/\" \/>\n<meta property=\"og:site_name\" content=\"SHINKOSHA Crystals for a bright future\" \/>\n<meta property=\"article:modified_time\" content=\"2021-08-10T02:19:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/sapphire_cut.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2244\" \/>\n\t<meta property=\"og:image:height\" content=\"1143\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/\",\"url\":\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/\",\"name\":\"Properties of Sapphire - SHINKOSHA Crystals for a bright future\",\"isPartOf\":{\"@id\":\"https:\/\/www.shinkosha.com\/english\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/sapphire_cut.jpg\",\"datePublished\":\"2021-06-03T02:33:47+00:00\",\"dateModified\":\"2021-08-10T02:19:56+00:00\",\"description\":\"Shinkosha is a leading company of oxide single crystal production. We are one of the largest sapphire crystal manufacturer in Japan, and also one of the largest rutile crystal manufacturer in the world.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#primaryimage\",\"url\":\"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/sapphire_cut.jpg\",\"contentUrl\":\"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/sapphire_cut.jpg\",\"width\":2244,\"height\":1143},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u30db\u30fc\u30e0\",\"item\":\"https:\/\/www.shinkosha.com\/english\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Tech Infomation\",\"item\":\"https:\/\/www.shinkosha.com\/english\/techinfo\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Properties of Sapphire\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.shinkosha.com\/english\/#website\",\"url\":\"https:\/\/www.shinkosha.com\/english\/\",\"name\":\"SHINKOSHA Crystals for a bright future\",\"description\":\"Shinkosha is a leading company of oxide single crystal production. We are one of the largest sapphire crystal manufacturer in Japan, and also one of the largest rutile crystal manufacturer in the world.\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.shinkosha.com\/english\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Properties of Sapphire - SHINKOSHA Crystals for a bright future","description":"Shinkosha is a leading company of oxide single crystal production. We are one of the largest sapphire crystal manufacturer in Japan, and also one of the largest rutile crystal manufacturer in the world.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/","og_locale":"en_US","og_type":"article","og_title":"Properties of Sapphire - SHINKOSHA Crystals for a bright future","og_description":"Shinkosha is a leading company of oxide single crystal production. We are one of the largest sapphire crystal manufacturer in Japan, and also one of the largest rutile crystal manufacturer in the world.","og_url":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/","og_site_name":"SHINKOSHA Crystals for a bright future","article_modified_time":"2021-08-10T02:19:56+00:00","og_image":[{"width":2244,"height":1143,"url":"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/sapphire_cut.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/","url":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/","name":"Properties of Sapphire - SHINKOSHA Crystals for a bright future","isPartOf":{"@id":"https:\/\/www.shinkosha.com\/english\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#primaryimage"},"image":{"@id":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#primaryimage"},"thumbnailUrl":"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/sapphire_cut.jpg","datePublished":"2021-06-03T02:33:47+00:00","dateModified":"2021-08-10T02:19:56+00:00","description":"Shinkosha is a leading company of oxide single crystal production. We are one of the largest sapphire crystal manufacturer in Japan, and also one of the largest rutile crystal manufacturer in the world.","breadcrumb":{"@id":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#primaryimage","url":"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/sapphire_cut.jpg","contentUrl":"https:\/\/www.shinkosha.com\/english\/wp-content\/uploads\/sites\/2\/2021\/07\/sapphire_cut.jpg","width":2244,"height":1143},{"@type":"BreadcrumbList","@id":"https:\/\/www.shinkosha.com\/english\/techinfo\/feature\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u30db\u30fc\u30e0","item":"https:\/\/www.shinkosha.com\/english\/"},{"@type":"ListItem","position":2,"name":"Tech Infomation","item":"https:\/\/www.shinkosha.com\/english\/techinfo\/"},{"@type":"ListItem","position":3,"name":"Properties of Sapphire"}]},{"@type":"WebSite","@id":"https:\/\/www.shinkosha.com\/english\/#website","url":"https:\/\/www.shinkosha.com\/english\/","name":"SHINKOSHA Crystals for a bright future","description":"Shinkosha is a leading company of oxide single crystal production. We are one of the largest sapphire crystal manufacturer in Japan, and also one of the largest rutile crystal manufacturer in the world.","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.shinkosha.com\/english\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/pages\/1049","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/comments?post=1049"}],"version-history":[{"count":13,"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/pages\/1049\/revisions"}],"predecessor-version":[{"id":1319,"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/pages\/1049\/revisions\/1319"}],"up":[{"embeddable":true,"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/pages\/1098"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/media\/1189"}],"wp:attachment":[{"href":"https:\/\/www.shinkosha.com\/english\/wp-json\/wp\/v2\/media?parent=1049"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}