铍是一种钢灰色的金属,在室温下很脆, 它的化学性质与铝有些相似. 它在自然界中不是自由发生的. 铍存在于绿柱石和祖母绿中,这两种矿物为古埃及人所知. 尽管长期以来人们一直怀疑这两种矿物是相似的, 这一点直到18世纪晚期才得到化学证实. 祖母绿现在被认为是绿柱石的绿色变种. 1798年,法国化学家Nicolas-Louis Vauquelin在绿柱石和祖母绿中发现了铍的氧化物,1828年,德国化学家Friedrich W\u00f6hler和法国化学家Antoine A分别将铍分离出来.B. 用钾还原它的氯化物.<\/p>
铍广泛分布在地球地壳中,估计在地球火成岩中存在的程度为0.0002%. 它在宇宙中的丰度是20倍,而标准硅的丰度是100万倍. The United States has about 60 percent of the world\u2019s beryllium and is by far the largest producer of beryllium; other major producing countries include China, 莫桑比克, 和巴西. Application Areas of Titanium<\/p><\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ \ t \ t \ \ t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/div>\ n \ t \ t \ \ \ t \ \ t\t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/section>\ n \ t \ t \ \ t
Symbol – Be<\/p>
Atomic Number – 4<\/p>
原子量\u2013.012<\/p>
Melting Point – 1287\u00b0C, 2349\u00b0F, 1560 K\u00a0<\/p>
Boiling Point – 2468\u00b0C, 4474\u00b0F, 2741 K\u00a0<\/p>
密度\u2013 1.85<\/p>
Oxidation States – 2<\/p>
电子排布- [He] 2s2<\/sup>\u00a0<\/p><\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ \ t \ t \ \ t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/div>\ n \ t \ t \ \ \ t \ \ t\t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/section>\ n \ t \ t \ \ t
铍与铜或镍的合金用于制造陀螺仪, 弹簧, 电触点, 点焊电极和无火花工具. 将铍与这些金属混合可以提高它们的导电性和导热性.<\/p>
其它铍合金被用作高速飞机的结构材料, 导弹, 航天器和通信卫星.<\/p>
铍对x射线是相对透明的,所以超薄的铍箔被用于x射线光刻. 铍也在核反应堆中用作中子的反射器或慢化剂.<\/p>
氧化物具有很高的熔点,使其在核工作和陶瓷应用中很有用.<\/p><\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ \ t \ t \ \ t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/div>\ n \ t \ t \ \ \ t \ \ t\t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/section>\ n \ t \ t \ \ t
Properties<\/span>\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Metric\u00a0<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Imperial<\/span><\/p>
Den<\/i>sity\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.844 g \ /厘米3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/sup>0.066磅\ /3<\/sup><\/p>
Melting point\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1273-1293 \u00b0C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2323-2341 \u00b0F<\/p>
Boiling point\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2970 \u00b0C\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 5378\u00b0F<\/p><\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ \ t \ t \ \ t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/div>\ n \ t \ t \ \ \ t \ \ t\t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/section>\ n \ t \ t \ \ t
Properties<\/u>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Metric<\/u>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Imperial<\/u><\/p>
Tensile strength\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 370 MPa\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 53700 psi<\/p>
Modulus of elasticity\u00a0\u00a0\u00a0\u00a0\u00a0 303 GPa\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 43900 ksi<\/p>
Shear modulus\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 135 GPa\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 19600 ksi<\/p>
硬度, Rockwell B\u00a0\u00a0\u00a0\u00a0 75-85\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 75-85<\/p>
Elongation at break\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3%\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3%\u00a0\u00a0\u00a0<\/p><\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ t \ \ t<\/div>\ n \ t \ \ t \ t \ \ t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/div>\ n \ t \ t \ \ \ t \ \ t\t<\/div>\ n \ t \ t \ \ \ t<\/div>\n\t\t<\/section>\ n \ t \ t \ \ t
Properties<\/u>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Metric<\/u>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 Imperial<\/u><\/p>
热膨胀系数(@25\u00baC\/77\u00baF)\u00a0.5 \u00b5m\/m\u00baC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0.39\u00b5in\/in\u00baF<\/p>
导热系数\ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 216 W \ /可\ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 \ u00a0 1500 BTU \ /人力资源.英国《mg免费送2000试玩金》\ u00b2.\u00b0F<\/p>
Beryllium<\/span> Read More »<\/a><\/p>\n",“受保护的”:假},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"http:\/\/ussupply2020.com \ /wp-json\/wp\/v2\/pages\/291"}],"collection":[{"href":"http:\/\/ussupply2020.com \ /wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/ussupply2020.com \ /wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/ussupply2020.com \ /wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/ussupply2020.com \ /wp-json\/wp\/v2\/comments?post=291"}],"version-history":[{"count":39,"href":"http:\/\/ussupply2020.com \ /wp-json\/wp\/v2\/pages\/291\/revisions"}],"predecessor-version":[{"id":752,"href":"http:\/\/ussupply2020.com \ /wp-json\/wp\/v2\/pages\/291\/revisions\/752"}],"wp:attachment":[{"href":"http:\/\/ussupply2020.com \ /wp-json\/wp\/v2\/media?parent=291"}],"curies":[{"name":"wp","href":"http:\/\/api.w.org\/{rel}","templated":true}]}}