12027-05-3

Basic information

• Product Name: hafnium tetrahydrate
• CAS NO: 12027-05-3
• Molecular Formula: H₄HfO₄
• Molecular Weight: 250.5511
• Mol File: 12027-05-3.mol

Chemical Properties

• Boiling Point: 100°C at 760 mmHg
• Vapor Pressure: 24.5mmHg at 25°C
• CAS DataBase Reference: hafnium tetrahydrate(CAS DataBase Reference)
• NIST Chemistry Reference: hafnium tetrahydrate(12027-05-3)
• EPA Substance Registry System: hafnium tetrahydrate(12027-05-3)

Safety Data

• Hazardous Substances Data: 12027-05-3(Hazardous Substances Data)

Usage

Uses

Used in Microelectronics Industry:
Hafnium tetrahydrate is utilized as a precursor for the production of high-quality hafnium oxide films. These films are essential in the development of advanced capacitors and transistors, contributing to the performance and miniaturization of microelectronic devices.
Used in Hafnium Compounds Preparation:
Hafnium tetrahydrate serves as a starting material for the synthesis of other hafnium compounds, which have various applications in different industries, including aerospace, nuclear, and chemical industries.
Used in Hafnium Metal Purification Processes:
In the production of hafnium metal, hafnium tetrahydrate is employed in purification processes to ensure the high purity and quality of the final product, which is crucial for its performance in various applications.

Upstream product

• 7732-18-5 water 
• 13499-05-3 hafnium tetrachloride 
• 1333-74-0 hydrogen 
• 80937-33-3 oxygen 
• 13777-22-5 hafnium tetrabromide 
• 124-43-6 urea hydrogen peroxide adduct 

Downstream Products

• 15461-28-6 hafnium(IV) dichloride oxide octahydrate 

Relevant articles and documents

Infrared spectrum and structure of the Hf(OH)4 molecule

Laser-ablated Hf atoms react with H2O2 and with H2 + O2 mixtures in solid argon to form the Hf(OH) 2 and Hf(OH)4 molecules, which are identified from the effect of isotopic substitution on the matrix infrared spectra. Electronic structure calculations at the MP2 level varying all bond lengths and angles converge to nearly linear and tetrahedral molecules, respectively, and predict frequencies for these new product molecules and mixed isotopic substituted molecules of lower symmetry that are in excellent agreement with observed values, which confirms the identification of these hafnium hydroxide molecules. This work provides the first evidence for a metal tetrahydroxide molecule and shows that the metal atom reaction with H2O2 in excess argon can be used to form pure metal tetrahydroxide molecules, which are not stable in the solid state.

Infrared spectra and structures for Group 4 dihydroxide and tetrahydroxide molecules

Hafnium and zirconium atoms react with H2O2 molecules and with H2 + O2 mixtures to form M(OH) 2 and M(OH)4 molecules, which are trapped in solid argon and identified from isotopic shifts in

Thermodynamic Properties of Zirconium and Hafnium Hydroxides in Aqueous Solution

The enthalpies of solution of ZrCl4, ZrBr4, HfCl4, and HfBr4 in water and low-acidity and low-basicity solutions at 25°C are measured with an isothermal-jacket calorimeter. The standard enthalpies of formation of Zr(OH)4 and Hf(OH)4 in solution and the thermodynamic characteristics of formation of zirconium and hafnium tetrahydroxo complexes in aqueous solution are calculated.