7440-10-0

• 常用中文名：金属镨
• 常用英文名：Praseodymium
• CAS号：7440-10-0
• 分子式：Pr
• 分子量：140.908
• 相关类别： 无机化工 单质
• 发布时间：2018-03-08 08:00:00
• 更新时间：2024-01-10 18:29:56
• 【用途一】
  用作永磁材料、有色合金添加剂
  【用途二】
  用于制合金、催化剂、特种玻璃、颜料、陶瓷着色。用于ICP-AES、AAS、AFS、ICP-MS、离子色谱等。滴定分析用标准溶液。校准仪器和装置；评价方法；工作标准；质量保证/质量控制；其他。
  【用途三】
  主要用于SmPrCo和PrFeB磁性材料。

名称

• 中文名: 镨
• 英文名: praseodymium atom
• 中文别名: 金属镨
• 英文别名: EINECS 231-120-3; UNII-NKN7EZA750; Praseodymium-141; MFCD00011174; (144pr)praseodymium; Praseodymium

物化性质

• 密度: 6.71 g/mL at 25ºC(lit.)
• 沸点: 3520ºC(lit.)
• 熔点: 931ºC(lit.)
• 分子式: Pr
• 分子量: 140.908
• 精确质量: 140.907593
• 外观性状: 淡黄色或软,银色的韧性金属芯片
• 储存条件:

  加入紧封的储存器内，储存在阴凉、干燥的地方。确保工作间有良好的通风排气装置。远离火种、热源、氧化剂。

• 稳定性:

  若遵照规格使用和保存则不会分解，避免氧化物。β型(bcc)，黄色金属，99.9％纯度，≤12mm的颗粒，在潮湿空气中形成一层氧化物薄膜

• 计算化学:

  1.疏水参数计算参考值（XlogP）:无

  2.氢键供体数量:0

  3.氢键受体数量:0

  4.可旋转化学键数量:0

  5.互变异构体数量:无

  6.拓扑分子极性表面积0

  7.重原子数量:1

  8.表面电荷:0

  9.复杂度:0

  10.同位素原子数量:0

  11.确定原子立构中心数量:0

  12.不确定原子立构中心数量:0

  13.确定化学键立构中心数量:0

  14.不确定化学键立构中心数量:0

  15.共价键单元数量:1

• 更多:

  1. 性状：α型(hcp)，黄色金属，六方晶系，在潮湿空气中变暗，形成一层氧化物薄膜，溶液呈绿色

  2. 密度（g/mL,20℃）：6.773

  3. 相对蒸汽密度（g/mL,空气=1）：未确定

  4. 熔点（ºC）：935

  5. 沸点（ºC,常压）：3510

  6. 沸点（ºC,5.2kPa）：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（mmHg,25ºC）：未确定

  12. 饱和蒸气压（kPa, ºC）：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：不溶于酸或王水。

MSDS

Section 1: Product Identification Chemical Name:Praseodymium ingot (99.9% REO) CAS Registry Number:7440-10-0 Formula:Pr (under oil) EINECS Number:231-120-3 Chemical Family:metal or element Synonym:Rare earth metal; under white mineral oil, paraffin oil, Section 2: Composition and Information on Ingredients IngredientCAS NumberPercentACGIH (TWA)OSHA (PEL) Title Compound7440-10-0100%no datano data mineral oil8042-47-5%no datano data Section 3: Hazards Identification Emergency Overview:Mineral oil may be harmful if swallowed, an irritant, and possible tumorigen. Primary Routes of Exposure:Ingestion, inhalation of any dust. Eye Contact:Oil, and dust, if present, may cause slight to mild irritation of the eyes. Skin Contact:Dust, if present, may cause slight to mild irritation of the skin. Inhalation of any oil free fine dust may be irritating to the nasal cavity, mucous membranes and respiratory Inhalation: tract. Ingestion:No information is available on the physiological effects of ingestion. Mineral oil may be harmful. Acute Health Affects:Oil free dust, if present, may be irritating to skin, eyes and respiratory tract. Chronic Health Affects:No information available on long-term chronic effects. Impurities in some mineral oils may be tumorigens. 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. (For dust) Remove the victim to fresh air. Closely monitor the victim for signs of respiratory problems, such as Inhalation: difficulty in breathing, coughing, wheezing, or pain. In such cases seek immediate medical assistance. If oil ingested, seek medical attention immediately. Keep the victim calm. Give the victim water (only if Ingestion: conscious). Induce vomiting only if directed by medical personnel. SECTION 5: Fire Fighting Measures Flash Point:not applicable Autoignition Temperature:no data Explosion Limits:none Extinguishing Medium:Dry chemical or Class D metal fire agent. (As dust) If this product is involved in a fire, fire fighters should be equipped with a NIOSH approved positive Special Fire Fighting Procedures: pressure self-contained breathing apparatus. Hazardous Combustion andIf involved in a fire, burning metal may produce mildly irritating fumes of Praseodymium oxide or carbonate. Decomposion Products: Ingot may ignite during grinding. Any dust may form explosive mixtures with air. Evolves hydrogen with hot Unusual Fire or Explosion Hazards: water. SECTION 6: Accidental Release Measures Spill and Leak Procedures:Not applicable; material is a metal ingot. Mineral oil is a slipping hazard. SECTION 7: Handling and Storage Handling and Storage:Store under mineral oil. Handle under an inert atmosphere of argon. 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 protective clothing and gloves. Ventilation:If converted to a fine oil free dust, handle the material in an efficient fume hood. If the material is converted to an oil free fine dust and ventilation is not available a respirator should be worn. Respirator: The use of respirators requires a Respirator Protection Program to be in compliance with 29 CFR 1910.134. Ventilation:If converted to a fine oil free dust, handle the material in an efficient fume hood. Additional Protection:No additional protection required. SECTION 9: Physical and Chemical Properties Color and Form:packed in mineral oil Molecular Weight:140.9 Melting Point:935° Boiling Point:3127°C Vapor Pressure:no data Specific Gravity:6.782 Odor:none Solubility in Water:reacts with water SECTION 10: Stability and Reactivity Stability:air sensitive, moisture sensitive solid Hazardous Polymerization:no hazardous polymerization Conditions to Avoid:Contact with hot water. Any oil free fine dust mixed with air. Incompatibility:Water, alcohols, oxidizers, oxygen, halogens, halocarbons, mineral acids. Decomposition Products:None. For Mineral oil: carbon dioxide, carbon monoxide, organic fumes. SECTION 11: Toxicological Information RTECS Data:No information available in the RTECS files. Carcinogenic Effects:Mineral oil : Possible Tumorigen Mutagenic Effects:No data available Tetratogenic Effects:No data available 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):Water-reactive solid, N.O.S. Hazard Class (CFR):4.3 Additional Hazard Class (CFR):NA Packaging Group (CFR):III UN ID Number (CFR):UN# 2813 Shipping Name (IATA):Water-reactive solid, N.O.S. Hazard Class (IATA):4.3 Additional Hazard Class (IATA):NA Packaging Group (IATA):III UN ID Number (IATA):UN# 2813 SECTION 15: Regulatory Information TSCA:Listed in the TSCA inventory SARA (Title 313):Title compound not listed Second Ingredient:mineral oil listed in TSCA SECTION 16 - ADDITIONAL INFORMATION N/A

毒性和生态

生态学数据: 通常对水体无危害。

安全

• 符号: GHS02
• 信号词: Danger
• 危害声明: H250
• 警示性声明: P222-P231-P422
• 个人防护装备: Eyeshields;Faceshields;full-face particle respirator type N100 (US);Gloves;respirator cartridge type N100 (US);type P1 (EN143) respirator filter;type P3 (EN 143) respirator cartridges
• 危害码 (欧洲): F: Flammable;
• 风险声明 (欧洲): R17
• 安全声明 (欧洲): 17-7/9-33-16
• 危险品运输编码: UN 3208 4
• WGK德国: 3
• 包装等级: III
• 危险类别: 4.3

制备

主要矿物有独居石和氟碳铈镧矿。用钙还原无水氯化物或氟化物可制得金属镨。

1. 70g PrCl3、185g Ca在惰性气氛下彻底混合摇匀装入钽坩埚或用机动压力机将其压成圆柱体放入钽坩埚中，坩埚配有打孔的钽盖子以便通气，置于密闭MgO坩埚(d=0.0508m,h=0.1778m)中。然后放入石英管(d=0.05715m)中，管的一端熔封，另一端打磨后嵌入55/50锥形接头中。用石蜡将石英管密封在真空体系中。充入Ar(先通过热的金属铀纯化)到P＝101.325kPa，用6kW感应炉加热到550～600℃，使反应发生(钽坩埚温度突然上升为据)。5min后达到1000℃，维持13min使产生的稀土金属完全结块。冷却到室温，用水浸泡钽坩埚以除掉CaCl2、Ca，稀土金属融体保留在底部(1%～3%Ca)。

2. 在100mL镍坩埚中电解熔融的25gKOH＋10gNaOH＋2.5gH2O＋4gPr2O3+2gKClO3的混合物。镍坩埚置于300瓦的电炉中，用一支装金属箍头的玻璃温度计测量温度，粗的铂丝作为阳极稍稍浸入熔融物的液面下，坩埚作为阴极，电压4V。温度控制在320～335℃直至得到清澈的熔化物，而后形成一层发亮的黑色壳状物质，轻轻取出。350℃、380℃下进行第二次和第三次电解，得到产物。