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High Purity Titanium Dioxide, CR-EL/PT Series

The technology of electronics has shown very remarkable progress and electronic devices such as cellular phones and personal computers have become more and more popular. High performance, high accuracy and the miniaturization of those electronic devices have been eagerly required.

ISK has supplied high-purity titanium dioxides as raw materials of ceramic capacitors, noise filters and so on which are used in those electronics devices.

Main Applications

  • Raw materials for dielectric materials such as barium titanate and PZT as electronic ceramics for capacitors, piezoelectric devices and thermistors.
  • Raw materials for structural ceramics.

Properties of High-Purity Titanium Dioxide, CR-EL and PT series

Table 1. Grade Classification by Particle Size and Purity
Particle Size Purity of TiO2
99.99% 99.9% 99%
Middle PT-301 CR-EL PT-501R
Small

PT-401M

PT-401L

  PT-501A
Very small under development    
Fig. 1 Relationship between particle size and thermal shrinkage

Fig. 1 Relationship between particle size and thermal shrinkage

As in this figure, titanium dioxide grades with higher purity and/or smaller particle size start to shrink at relatively lower temperature.

Thus the purer and smaller grades can be expected to show higher reactivity in the synthesis of complex oxides such as barium titanate.

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Grade List

Particle Size Crystal Form TiO2 (%) Grade Name Electron Micrograph Remarks
Middle Rutile 99 PT-501R
(0.18µm)
Photo: PT-501R

Sulfate Process

PT-501R is suitable for conventional applications such as disc capacitors and PTC ceramics.

99.9 CR-EL
(0.25µm)
Photo: CR-EL

Chloride Process

CR-EL is the most popular grade as a raw material for MLCC applications.

99.99 PT-301
(0.25µm)
Photo: PT-301
Small Anatase 99 PT-501A
(0.1µm)
Photo: PT-501A Sulfate Process
Rutile 99.99 PT-401L
(0.13µm)
PT-401L

Chloride Process

These grades have smaller particle sizes than CR-EL, which are suitable for downsizing of the electronic devices.

PT-401M
(0.07µm)
Photo: PT-401M
Very Small Anatase 99.99 Under development Photo: Under development

Special Hydrolysis

The figure shows rutile grade with the specific surface are of 40m²/g. Other grades with various surface areas such as 60m2/g and 190m2/g are available.

Rutile

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CR-EL

CR-EL is ISK's standard grade manufactured by the chloride process.

The particle size of this grade is ca. 0.25µm which is the same size as conventional white pigment.

CR-EL shows excellent dispersibility and reactivity. Moreover, consistency of the quality has been achieved, which has made it suitable for electronic ceramic applications.

Photo: CR-EL

  CR-EL
TiO2(%)* 99.97
Rutile ratio (%) 99.1
Specific surface area (m²/g) 6.8
Average particle size (µm) 0.25
Impurities (%) Fe2O3 0.0031
Al2O3 0.006
SiO2 0.013
Nb2O5 0.000
Na2O 0.002
Moisture (%) 0.09
Ignition loss(%) 0.13

* TiO2(%)=(100-Total impurities(%))
Ignition loss, SO3, Cl and C are not taken into account in the above calculation.

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PT-301

PT-301 is a higher purity grade with the same particle size compared to CR-EL. It is also manufactured by the chloride process.

This grade shows as excellent dispersibility and reactivity as CR-EL, and it is suitable for electronic ceramic applications which especially require high purity.

Photo: PT-301

  PT-301 CR-EL
TiO2(%)* 99.99 99.97
Rutile ratio (%) 90.1 99.1
Specific surface area (m²/g) 6.8 6.8
Average particle size (µm) 0.27 0.25
Impurities (%) Fe2O3 0.0029 0.0031
Al2O3 0.000 0.006
SiO2 0.000 0.013
Nb2O5 0.000 0.000
Na2O 0.001 0.002
Moisture (%) 0.15 0.09
Ignition loss(%) 0.15 0.13

* TiO2(%)=(100-Total impurities(%))
Ignition loss, SO3, Cl and C are not taken into account in the above calculation.

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PT-401M

PT-401M is a high-purity titanium dioxide with small particle size, which is manufactured by the chloride process.

This grade shows as excellent dispersibility and reactivity as CR-EL, and it is suitable for electronic ceramic applications which especially require fine particles.

Photo: PT-401M

Photo: PT-401M

  PT-401M CR-EL
TiO2(%)* 99.99 99.97
Rutile ratio (%) 46.7 99.1
Specific surface area (m²/g) 20.5 6.8
Average particle size (µm) 0.07 0.25
Impurities (%) Fe2O3 0.0026 0.0031
Al2O3 0.003 0.006
SiO2 0.000 0.013
Nb2O5 0.001 0.000
Na2O 0.001 0.002
Moisture (%) 0.41 0.09
Ignition loss(%) 0.65 0.13

* TiO2(%)=(100-Total impurities(%))
Ignition loss, SO3, Cl and C are not taken into account in the above calculation.

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PT-501A, PT-501R

PT-501A and PT-501R are high-purity titanium dioxides manufactured by the sulfate process.

PT-501A is anatase whereas PT-501R is rutile in the crystal form.

These are suitable for various applications such as ceramic capacitors due to the narrow particle size distribution.

Photo: PT-501A

Photo: PT-501R

  PT-501A PT-501R
TiO2(%)* 99.74 99.74
Rutile ratio (%) (Anatase) 92.4
Specific surface area (m²/g) 16.5 8.9
Average particle size (µm) 0.10 0.18
Impurities (%) Fe2O3 0.0039 0.0039
Al2O3 0.009 0.002
SiO2 0.000 0.000
Nb2O5 0.14 0.14
Na2O 0.004 0.001
Moisture (%) 0.48 0.18
Ignition loss(%) 0.44 0.31

* TiO2(%)=(100-Total impurities(%))
Ignition loss, SO3, Cl and C are not taken into account in the above calculation.