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用作精细陶瓷原料粉。
用于陶瓷工业以及电接触器和半导体设备。
| 中文名 | 二硅化钽 |
|---|---|
| 英文名 | Tantalum disilicide |
| 中文别名 | 二矽化钽 |
| 英文别名 |
bis(λ<sup>2</sup>-silanylidene)tantalum
MFCD00049564 EINECS 234-902-2 |
| 密度 | 9.14 |
|---|---|
| 熔点 | 2200ºC |
| 分子式 | Si2Ta |
| 分子量 | 237.11900 |
| 精确质量 | 236.90200 |
| 外观性状 | Powder |
| 储存条件 | 室温 |
| 水溶解性 | Insoluble in water. |
| 计算化学 | 1、 氢键供体数量：0 2、 氢键受体数量：0 3、 可旋转化学键数量：0 4、 拓扑分子极性表面积（TPSA）：0 5、 重原子数量：3 6、 表面电荷：0 7、 复杂度：18.3 8、 同位素原子数量：0 9、 确定原子立构中心数量： 0 10、 不确定原子立构中心数量：0 11、 确定化学键立构中心数量：0 12、 不确定化学键立构中心数量：0 13、 共价键单元数量：1 |
| 更多 | 1. 性状：为暗灰色立方结晶粉末 2. 密度（g/mL,25℃）：9.14 3. 相对蒸汽密度（g/mL,空气=1）：未确定 4. 熔点（ºC）：2200 5. 沸点（ºC,常压）：未确定 6. 沸点（ºC，1mmHg）：未确定 7. 折射率：未确定 8. 闪点（ºC）：未确定 9. 比旋光度（º）：未确定 10. 自燃点或引燃温度（ºC）：未确定 11. 蒸气压（20ºC）：未确定 12. 饱和蒸气压（kPa,60ºC）：未确定 13. 燃烧热（KJ/mol）：未确定 14. 临界温度（ºC）：未确定 15. 临界压力（KPa）：未确定 16. 油水（辛醇/水）分配系数的对数值：未确定 17. 爆炸上限（%,V/V）：未确定 18. 爆炸下限（%,V/V）：未确定 19. 溶解性：未确定 20.晶格常数：a=0.4778nm，c=0.6558nm 21.显微硬度（kg·mm-2）：1407 22.弹性模量（kg·K-1）：30230 23.导电率（Ω·cm-1）：1.23×10-5 24.比热容（J/(g·℃)）：0.33 |
|
Section 1: Product Identification Chemical Name:Tantalum silicide (99.5%-Ta) CAS Registry Number:12039-79-1 Formula:TaSi2 EINECS Number:234-902-2 Chemical Family:metal silicide Synonym:Tantalum disilicide
Section 2: Composition and Information on Ingredients IngredientCAS NumberPercentACGIH (TWA)OSHA (PEL) Title compound12039-79-1100%10mg/m3(Ta)5mg/m3(Ta) Section 3: Hazards Identification Emergency Overview:May be irritating to skin, eyes and mucous membranes. Primary Routes of Exposure:Ingestion, inhalation. Eye Contact:May cause slight to mild irritation of the eyes. Skin Contact:May cause slight to mild irritation of the skin. Inhalation:Do not breathe dust. Dust may be irritating to the nose, mucous membranes and respiratory tract. Ingestion:No information is available on the physiological effects of ingestion. Acute Health Affects:Dust may be irritating to the nose, mucous membranes and respiratory tract. Chronic Health Affects:No information available on long-term chronic effects. NTP:No IARC:No OSHA:No SECTION 4: First Aid Measures Immediately flush the eyes with copious amounts of water for at least 10-15 minutes. A victim may need Eye Exposure: assistance in keeping their eye lids open. Get immediate medical attention. Wash the affected area with water. Remove contaminated clothes if necessary. Seek medical assistance if Skin Exposure: irritation persists. Remove the victim to fresh air. Closely monitor the victim for signs of respiratory problems, such as difficulty in Inhalation: breathing, coughing, wheezing or pain. In such cases seek immediate medical assistance. Seek medical attention immediately. Keep the victim calm. Give the victim water (only if conscious). Induce Ingestion: vomiting only if directed by medical personnel. SECTION 5: Fire Fighting Measures Flash Point:no data Autoignition Temperature:no data Explosion Limits:no data Extinguishing Medium:dry chemical, carbon dioxide, or foam. If this product is involved in a fire, fire fighters should be equipped with a NIOSH approved positive pressure Special Fire Fighting Procedures: self-contained breathing apparatus and full protective clothing. Hazardous Combustion andIf involved in a fire this material may emit irritating dusts. Decomposion Products: Unusual Fire or Explosion Hazards: No unusual fire or explosion hazard. SECTION 6: Accidental Release Measures Spill and Leak Procedures:Sweep up the material and dispose of properly. SECTION 7: Handling and Storage Handling and Storage:Store the material in a sealed container. SECTION 8: Exposure Controls and Personal Protection Eye Protection:Always wear approved safety glasses when handling a chemical substance in the laboratory. Skin Protection:Wear appropriate chemical resistant gloves and protective clothing. Ventilation:Material may form a fine dust. If possible, handle the material in an efficient fume hood. If in form of fine dust and ventilation is not available a respirator should be worn. The use of respirators Respirator: requires a Respirator Protection Program to be in compliance with 29 CFR 1910.134. Ventilation:Material may form a fine dust. If possible, handle the material in an efficient fume hood. Additional Protection:No additional protection required. SECTION 9: Physical and Chemical Properties Color and Form:-325 mesh gray pwdr. (avg. 10 microns or less) Molecular Weight:237.12 Melting Point:2200° Boiling Point:no data Vapor Pressure:not applicable Specific Gravity:9.14 Odor:none Solubility in Water:insoluble SECTION 10: Stability and Reactivity Stability:air and moisture stable Hazardous Polymerization:No hazardous polymerization. Conditions to Avoid:formation of a fine dust Incompatibility:mineral acids Decomposition Products:none SECTION 11: Toxicological Information RTECS Data:No information available in the RTECS files. Carcinogenic Effects:no data Mutagenic Effects:no data Tetratogenic Effects:no data SECTION 12: Ecological Information Ecological Information:No information available SECTION 13: Disposal Considerations Disposal:Dispose of according to local, state and federal regulations. SECTION 14: Transportation Shipping Name (CFR):Non-hazardous Hazard Class (CFR):NA Additional Hazard Class (CFR):NA Packaging Group (CFR):NA UN ID Number (CFR):NA Shipping Name (IATA):Non-hazardous Hazard Class (IATA):NA Additional Hazard Class (IATA):NA Packaging Group (IATA):NA UN ID Number (IATA):NA SECTION 15: Regulatory Information TSCA:Listed in the TSCA inventory. SARA (Title 313):Title compound not listed. Second Ingredient:none SECTION 16 - ADDITIONAL INFORMATION N/A |
1.以金属钽和硅粉为原料，将金属钽和硅粉进行粉碎并混合均匀，再将其放入石墨炉内加热至1100～1500℃进行预反应，然后通入氢气，再升温至800℃进行反应，即得硅化钽。或者用氢化钙还原五氧化二钽得到氢化钽，再加热至1800℃得金属钽，然后加入硅粉合成得硅化钽。
2.将Si和Ta混合物先预热至350℃，然后升温至1480℃，加热反应。或令TaS2与SiHnX4-n在900℃下反应制得。
3.直接法 以金属钽和硅粉为原料制备硅化钽，反应式如下。
首先将金属钽和硅粉进行粉碎并混合均匀，再将其放入石墨炉内加热至
1100～1500℃进行预反应，然后通入氢气，再升温至1800.℃进行均化反应1h，即得硅化钽。
4.五氧化二钽还原法 首先用氢化钙还原五氧化二钽得到氢化钽，再加热至1800℃得金属钽，然后加入硅粉合成得硅化钽。