Bewise Inc. www.tool-tool.com Reference source from the internet.
24 vanadicròmemanganès
-

Cr

Mo
Generalitats
Nom, Simbòl, Numero cròme, Cr, 24
Tièra quimica metals de transicion
Grop, Periòde, Blòc 6, 4, d
Aparéncia silvery metallic
Massa atomica 51.9961(6) g/mol
Configuracion electronica [Ar] 3d5 4s1
Electrons per nivèl energetic 2, 8, 13, 1
Proprietats fisicas
Fasa solid
Densitat (temperatura ambienta) 7.15 g/cm³
Densitat liquida al punt de fusion 6.3 g/cm³
Punt de fusion 2180 K
(1907 °C, 3465 °F)
Punt d'ebullicion 2944 K
(2671 °C, 4840 °F)
Calor de fusion 21.0 kJ/mol
Calor de vaporizacion 339.5 kJ/mol
Capacitat calorifica (25 °C) 23.35 J/(mol·K)
Pression de vapor
P/Pa 1 10 100 1 k 10 k 100 k
a T/K 1656 1807 1991 2223 2530 2942
Proprietats atomicas
Estructura cristallina cubica de fàcia centrada
Estat d'oxidacion 6, 3, 2
(oxid fòrtament acid)
Electronegativitat 1.66 (Escala de Pauling)
Potencials d'ionizacion
(mai)
1èr : 652.9 kJ/mol
2nd : 1590.6 kJ/mol
3en : 2987 kJ/mol
Rai atomic 140 pm
Rai atomic calculat 166 pm
Rai covalent 127 pm
Informacions divèrsas
Magnetisme AFM (rather: SDW)
Resistivitat electrica (20 °C) 125 nΩ·m
Conductivitat termica (300 K) 93.9 W/(m·K)
Dilatacion termica (25 °C) 4.9 µm/(m·K)
Velocitat del son (20 °C) 5940 m/s
Modul de Young 279 GPa
Shear modulus 115 GPa
Modul de Bulk 160 GPa
Coeficient de Poisson 0.21
Duretat de Mohs 8.5
Vickers hardness 1060 MPa
Duretat de Brinell 1120 MPa
Numèro CAS 7440-47-3
Isotòps mai estables
Article : Isotòps del (de l') cròm
iso NA Mièja vida MD ED (MeV) PD
50Cr syn > 1.3 E18 y εε - 50Ti
51Cr syn 27.7025 d ε - 51V
γ 0.320 -
52Cr 83.789% Cr es estable amb 28 neutrons
53Cr 9.501% Cr es estable amb 29 neutrons
54Cr 2.365% Cr es estable amb 30 neutrons


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BW специализируется в научных исследованиях и разработках, и снабжаем самым высокотехнологичным карбидовым материалом для поставки режущих / фрезеровочных инструментов для почвы, воздушного пространства и электронной индустрии. В нашу основную продукцию входит твердый карбид / быстрорежущая сталь, а также двигатели, микроэлектрические дрели, IC картонорезальные машины, фрезы для гравирования, режущие пилы, фрезеры-расширители, фрезеры-расширители с резцом, дрели, резаки форм для шлицевого вала / звездочки роликовой цепи, и специальные нано инструменты. Пожалуйста, посетите сайт www.tool-tool.com для получения большей информации.

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