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铼单晶

铼单晶 75Re186.2


说明:铼是一种银色的金属。但通常是灰色粉末。它耐腐蚀,但在潮湿的空气中会慢慢的失去光泽。铼溶于硝酸和硫酸。被用于电热丝,热敏电阻和催化剂。


铼单晶性能参数


状态:

单晶


晶体结构:

hexagonal


生产方法:

Floating zone


标准尺寸:

diameter 6mm

thickness 1-2mm


晶向:

(0001), (1-100) and (11-20)


晶向精度:

<2°, <1°, <0.5° or <0.1°


纯度:

as cut, one or two sides polished


表面粗糙度:

<0.03μm


典型分析:

99.99%


典型分析(ppm):

Ag < 0.10

Al 2.00

Au 0.90

C 15.0

Cl 3.00

Co 0.20

Cr 2.50

Cu 0.40

Fe 15.0

H < 1.00

Mg 0.03

Mn 1.00

Mo 2.00

N < 5.00

Na 0.20

Ni < 1.00

Pt 10.0

O 6.00

Si 10.0

Ti 1.00

Ta 0.30

V 0.20

W 10.0

Zr 2.00

Rh balance


其他性能参数


晶体结构:

(cell dimensions/pm), space group

h.c.p. (a=276.09), c=445.76), P63/mmc

X射线衍射质量吸收系数:

CuKa 179 (μ/r) / cm2g-1

MoKa 103 (μ/r) / cm2g-1

中子散射距离:

0.92 b/10-12 cm

热中子捕获横截面:

89.7 sa / barns

密度:

12.4 g/cm3

熔点:

3179.85 °C / 3453 °K

沸点:

5626.85 °C / 5900 °K

摩尔体积:

8.86 cm3

导热系数:

47.9 [300 K] Wm-1K-1

热膨胀线系数:

6.63 x 10-6 K-1

电阻系数:

19.3x10-8 [293 K] Wm

聚磁敏感性:

+4.56 x 10-9(s) kg-1m3

杨氏模量:

466 GPa

刚性模量:

181 GPa

体积模量:

334 GPa

泊松比:

0.26 GPa

半径:

Re7+ 60; Re6+ 61; Re4+ 72; atomic 137; covalent 128

负电性:

1.9 (Pauling); 1.46 (Allred); 4.02 eV (absolute)

有效核电荷:

3.60 (Slater); 10.12 (Clementi); 14.62 (Froese-Fischer)

同位素:

34

同位素质量范围:

162 -> 192


生物资料


生物类别:

none

毒性:

Not established, but believed to be low.

毒性摄取量:

n.a.

致命摄取量:

LD50 (ReCl3, intraperitoneal, mouse)= 280 mg kg-1

危险性:

There are no reported cases of humans beeing affected by rhenium. Like other powdered metals, rhenium dust could pose a moderate fire or explosion hazard.

人体等级


器官:

n.a., but very low

每日食物摄取量:

n.a.

70kg成人平均总元素含量:

n.a., but very low


地质资料


矿物:

Rhenium does not occur in nature as the free metal, nor has a distinct rhenium mineral species been found. Gadolinite (see beryllium) and molybdenite (see molybdenum) may contain up to 0.2% rhenium.

主要矿石:

Rhenium is extracted from the flue dusts of molybdenum smelters.

世界产量:

4.5 tonnes/year

主要矿区:

see molybdenum

储量:

3500 tonnes

样品:

available as foil, powder, ribbon or wire. CARE !


总含量


太阳:

<2 (relative to H = 1 x 1012)

地壳:

4 x 10-4 p.p.m.

海水:

4 x 10-6 p.p.m.

氧化态:

III

 

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