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HAFNIUM OXIDE

Physical Properties Uses Preparation Reactions
HAFNIUM OXIDE
HAFNIUM OXIDE structure
CAS No.
12055-23-1
Chemical Name:
HAFNIUM OXIDE
Synonyms
HfO2;Hafnia;dioxohafniuM;Hafnia, felt;HAFNIUM OXIDE;HAFNIUM(+4)OXIDE;Hafnia bulk fiber;HAFNIUM(IV) OXIDE;hafniumoxide(hfo2);Hafnium oxide/ 99+%
CBNumber:
CB5737990
Molecular Formula:
HfO2
Formula Weight:
210.49
MOL File:
12055-23-1.mol

HAFNIUM OXIDE Properties

Melting point:
2810 °C
Density 
9.68 g/mL at 25 °C(lit.)
refractive index 
2.13 (1700 nm)
form 
powder
color 
Off-white
Specific Gravity
9.68
Water Solubility 
Insoluble in water.
Merck 
14,4588
CAS DataBase Reference
12055-23-1(CAS DataBase Reference)
SAFETY
  • Risk and Safety Statements
Safety Statements  22-24/25
WGK Germany  3
TSCA  Yes
HS Code  28259085

HAFNIUM OXIDE price More Price(25)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 202118 Hafnium(IV) oxide powder, 98% 12055-23-1 25g $72.6 2018-11-13 Buy
Sigma-Aldrich 202118 Hafnium(IV) oxide powder, 98% 12055-23-1 100g $219 2018-11-13 Buy
Alfa Aesar 011835 Hafnium(IV) oxide, 99% (metals basis excluding Zr), Zr <1.5% 12055-23-1 100g $235 2018-11-16 Buy
Alfa Aesar 011835 Hafnium(IV) oxide, 99% (metals basis excluding Zr), Zr <1.5% 12055-23-1 25g $77.1 2018-11-16 Buy
Strem Chemicals 72-5200 Hafnium(IV) oxide (99.995%-Hf, <0.15% Zr) PURATREM 12055-23-1 1g $111 2018-11-13 Buy

HAFNIUM OXIDE Chemical Properties,Uses,Production

Physical Properties

White crystalline solid, when heated at 1,500°C, it transforms into a tetragonal modification with shrinkage; tetragonal form converts to a cubic polymorph with fluorite structure when heated at 2,700°C; density 9.68 g/cm3; melts at 2,774°C; insoluble in water; dissolves slowly in hydrofluoric acid at ordinary temperatures.

Uses

Hafnium dioxide is a high temperature refractory material. It is used for control rods in nuclear reactors. It has high stability and high thermal neutron absorption values. It also is used in special optical glasses and glazes.

Preparation

Hafnium dioxide may be prepared by heating the metal with air or oxygen at elevated temperatures (above 400°C). Also, the oxide can be obtained by igniting hafnium salts, such as hydroxide, oxalate, sulfate, nitride, carbide, boride or tetrachloride in air. Hafnium carbide converts to dioxide when heated with oxygen at 500°C. The commercial products generally contain about 95-97% hafnium dioxide mixed with small amount of zirconium oxide. The compound can be prepared at 99.9% purity.

Reactions

Hafnium dioxide reacts with chlorine in the presence of carbon at elevated temperatures to yield hafnium tetrachloride, HfCl4. When ammonium hydroxide solution is added to an acid solution of hafnium dioxide, the hydrous oxide, HfO2•xH2O precipitates.
When heated with concentrated sulfuric acid, the product is hafnium sulfate, Hf(SO4)2.
Reaction with carbon at 1,500°C produces hafnium carbide, HfC.
Reaction with sodium fluorosilicate, Na2SiF6 at elevated temperatures yields sodium fluorohafnate, Na2HfF6.

Description

Hafnium is a shiny, silvery, ductile metal and resistant to corrosion. The physical properties of hafnium metal samples are markedly affected by zirconium impurities, especially the nuclear properties, as these two elements are among the most difficult to separate because of their chemical similarity. Hafnia is used in optical coatings and as a high-k dielectric in dynamic randomaccess memory (DRAM) capacitors. Hafnium (IV) oxide is a colourless, inert solid and has been reported as one of the most common and stable compounds of hafnium. It is an electrical insulator. Hafnium dioxide is an intermediate in some processes that give hafnium metal. It reacts with strong acids and strong bases. It dissolves slowly in hydrofluoric acid. At high temperatures, it reacts with chlorine in the presence of graphite or carbon tetrachloride and forms the hafnium tetrachloride. Hafnium-based oxides are currently important materials to replace silicon oxide as a gate insulator because of its high dielectric constant. Hafnium (Hf) is found in association with zirconium ores, production based on zircon (ZrSiO4) concentrates which contain 0.5%–2% hafnium. Hafnium has extensive applications in industries especially because of its resistance to corrosion. Different compounds of hafnium used in ceramics industry are hafnium boride, hafnium carbide, hafnium nitride, hafnium oxide, hafnium silicate, and hafnium titanate. Hafnium-based oxides are currently leading candidates to replace silicon oxide as a gate insulator in fieldeffect transistors. The compound appears to have been chosen by both IBM and Intel as a substrate for future integrated circuits, where it may help in the continuing effort

Chemical Properties

Hafnium is a refractory metal which occurs in nature in zirconium minerals.

Potential Exposure

Hafnium metal has been used as a control rod material in nuclear reactors. Thus, those engaged in fabrication and machining of such rods may be exposed.

Shipping

UN1326 Hafnium powder, wetted with not <,25% water (a visible excess of water must be present) (1) mechanically produced, particle size<53 μm; (2) chemically produced, particle size<840 μm, Hazard Class: 4.1; Labels: 4.1-Flammable solid. UN2545 Hafnium pow der, dry, Hazard Class: 4.1; Labels: 4.1-Flammable solid. UN1346 Hafnium powder, wetted with not less than 25% water (a visible excess of water must be present) (1) mechanically produced, particle size less than 53 μm; (2) chemically produced, particle size less than 840 μm, Hazard Class: 4.1; Labels: 4.1-Flammable solid.

Incompatibilities

Fine powder or dust may form explosive mixture in air. The powder is highly flammable and a strong reducing agent. The powder or dust reacts with moisture forming flammable hydrogen gas; may spontaneously ignite on contact with moist air; and at higher temperatures, with nitrogen, phosphorous, oxygen, halogens, and sulfur; contact with hot nitric acid; heat, shock, friction, strong oxidizers; or ignition sources may cause explosions.

Waste Disposal

Recovery. Consider recycling, otherwise, this chemical must be disposed of in compliance with existing federal and local regulations.

HAFNIUM OXIDE Preparation Products And Raw materials

Raw materials

Preparation Products


HAFNIUM OXIDE Suppliers

Global( 80)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817
info@dakenchem.com CHINA 21701 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 20672 55
Mainchem Co., Ltd.
+86-0592-6210733
+86-0592-6210733 sales@mainchem.com CHINA 32447 55
career henan chemical co
+86-371-86658258
sales@coreychem.com CHINA 29979 58
Hubei Jusheng Technology Co.,Ltd.
86-18871470254
027-59599243 sales@jushengtech.com CHINA 28236 58
Chongqing Chemdad Co., Ltd +86-13650506873
sales@chemdad.com CHINA 30864 58
Forsman Scientific ( Beijing ) Co., Ltd. +86-10-6464 6565
+86-10-6464 6568 info@forsman.com.cn;salesd@forsman.com.cn China 691 58
Shanghai JONLN Reagent Co., Ltd. 400-0066-400;021-60496031
021-55660885 shjlsw@163.com China 10152 55
J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
86-10-82849933 jkinfo@jkchemical.com;market6@jkchemical.com China 96506 76
INTATRADE GmbH +49 3493/605464
+49 3493/605470 sales@intatrade.de Germany 3579 66

View Lastest Price from HAFNIUM OXIDE manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-07-09 HAFNIUM OXIDE
12055-23-1
US $1.00 / KG 1KG 99% 100kg career henan chemical co

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