ChemicalBook >?? ???? >??????? ????????
??????? ????????
|
|
??????? ???????? ??
- ???
- 800°C
- ??
- 3.148
- ???
- insoluble in H2O
- ??? ??
- ??
- ??? ??
- ??? ??
- ??
- Moisture Sensitive
- CAS ??????
- 12044-49-4
??
- ?? ? ?? ??
- ?? ? ???? ?? (GHS)
| ????(UN No.) | UN1557 | ||
|---|---|---|---|
| TSCA | TSCA listed | ||
| ?? ?? | 6.1 | ||
| ???? | II | ||
| ???? ?? | KE-22676 | ||
| ?????? ??? | 97-1-119 | ||
| ?????? ??? | ??2-218 | ||
| ?, ??????? ??? | 126 | ||
| ?? ? ???? | ????: ????; ???(??)????: ?? ?? ? ???? ?????? 0.1% ?? ??? ??? |
| ????(GHS): |
 
|
|||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ?? ?: | Danger | |||||||||||||||||||||||||||||||||||
| ??·?? ??: |
|
|||||||||||||||||||||||||||||||||||
| ??????: |
|
??????? ???????? C??? ??, ??, ??
??
Magnesium arsenide has the molecular formula of Mg3As2 and the molecular weight of 223.6592 g/mol. It may be prepared by direct reaction between the elements. Since As sublimes at 614°C and Mg melts at 650°C, the latter is melted at about 675°C in an inert atmosphere like argon (not N2 which would form nitrides) and arsenic vapors are carried into the reaction zone by a stream of Ar gas:3Mg + 2As + heat Mg3As2
Mg3As2 is obtained by this method as a deep-brown, X-ray amorphous powder. Magnesium arsenide has the CAS number of 12044-49-4. This compound decomposes in contact with water:
Mg3As2 + 3H2O 2AsH3 + 3Mg(OH)2
Thus, it must be stored under dry conditions. Its density is 3.15 g/cm3. This compound is dimorphic with the low temperature form, β-Mg3As2 being cubic (α = 12.33) and the high-temperature form, α-Mg3As2 being hexagonal. It crystallizes in the anti-La2O3 crystal structure, with unit-cell parameters of: a = 4.264A ° , c = 6.738, c/a = 1.580. Both of these compounds are semiconductors. The latter has a band gap, Eg, of 2.2eV (564 nm).
??
The structure of magnesium arsenide is not ionic but covalent. Magnesium arsenide was used as a rodenticide and insecticide. Its toxicity to humans has led to its prohibition in the US and Europe.??????? ???????? ?? ?? ? ???
???
?? ??
??????? ???????? ?? ??
???( 21)?? ??
| ??? | ?? | ??? | ?? | ?? ? | ?? |
|---|---|---|---|---|---|
| BOC Sciences | +1-631-485-4226 |
inquiry@bocsci.com | United States | 19936 | 58 |
| XIAMEN AMITY INDUSTRY AND TRADE CO., LTD. | +8618950047208 |
ellena@amitychem.com | China | 43414 | 58 |
| 3B Pharmachem (Wuhan) International Co.,Ltd. | 18930552037 |
3bsc@sina.com | China | 15838 | 69 |
| Alfa Aesar | 400-6106006 |
saleschina@alfa-asia.com | China | 30123 | 84 |
| Energy Chemical | 021-021-58432009 400-005-6266 |
sales8178@energy-chemical.com | China | 44816 | 61 |
| Beijing HuaMeiHuLiBiological Chemical | 010-56205725 |
waley188@sohu.com | China | 12335 | 58 |
| Guangzhou Jhd Chemical Reagent Co., Ltd. | 020-84383047 |
sales@jhd.com.cn | China | 9186 | 65 |
| Santa Cruz Biotechnology Inc | -- |
scbt@scbt.com | China | 6594 | 58 |