Abstract
Polycrystalline samples of stoichiometric spinels, Mg1+xTi2-xO4 (0≤x≤1.0), and spinels with cation diversity, Mg(1+x)yTi2-xO4 and Mg1+xTi(2-x)y,O4 (x=0.4215, y=0.95-1.05), and oxygen deficiency Mg1+xTi2-xO4-δ (x=0.4215, δ=0.05-0.30) were prepared by solid-state reaction of MgO, TiO2 and Ti to examine the effects of the composition and holding time on the structure of the spinel phase, the impurity phase formation behavior and the electrical properties. In addition to Mg2TiO4 (x=1) prepared at 1300°C under an ambient atmosphere, samples were prepared at 1250°C under an argon atmosphere. Compositional analyses revealed that volatilization of compounds and oxidation during firing were negligible. The variation in the unit cell parameter a of the spinel phase indicated solid-solution formation for all stoichiometric samples in spite of the presence of impurities. The impurity-phase formation behavior was strongly dependent upon synthetic conditions, x-value, and induced nonstoichiometry. Other than the insulating Mg2TiO4, resistivity measurements indicated that all samples were semiconducting below room temperature. No distinct variation in resistivity behavior was observed for samples with different holding time or with induced nonstoichiometry.
| Original language | English |
|---|---|
| Pages (from-to) | 101-105 |
| Number of pages | 5 |
| Journal | Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan |
| Volume | 105 |
| Issue number | 2 |
| Publication status | Published - 1997 |
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Keywords
- Electrical properties
- Magnesium titanate
- Nonstoichiometry
- Solid solution
- Solid-state reaction
- Spinel structure
ASJC Scopus subject areas
- Ceramics and Composites
Cite this
Preparation of stoichiometric and nonstoichiometric magnesium titanate spinels. / Sugimoto, Wataru; Kaneko, Naohiro; Sugahara, Yoshiyuki; Kuroda, Kazuyuki.
In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 105, No. 2, 1997, p. 101-105.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Preparation of stoichiometric and nonstoichiometric magnesium titanate spinels
AU - Sugimoto, Wataru
AU - Kaneko, Naohiro
AU - Sugahara, Yoshiyuki
AU - Kuroda, Kazuyuki
PY - 1997
Y1 - 1997
N2 - Polycrystalline samples of stoichiometric spinels, Mg1+xTi2-xO4 (0≤x≤1.0), and spinels with cation diversity, Mg(1+x)yTi2-xO4 and Mg1+xTi(2-x)y,O4 (x=0.4215, y=0.95-1.05), and oxygen deficiency Mg1+xTi2-xO4-δ (x=0.4215, δ=0.05-0.30) were prepared by solid-state reaction of MgO, TiO2 and Ti to examine the effects of the composition and holding time on the structure of the spinel phase, the impurity phase formation behavior and the electrical properties. In addition to Mg2TiO4 (x=1) prepared at 1300°C under an ambient atmosphere, samples were prepared at 1250°C under an argon atmosphere. Compositional analyses revealed that volatilization of compounds and oxidation during firing were negligible. The variation in the unit cell parameter a of the spinel phase indicated solid-solution formation for all stoichiometric samples in spite of the presence of impurities. The impurity-phase formation behavior was strongly dependent upon synthetic conditions, x-value, and induced nonstoichiometry. Other than the insulating Mg2TiO4, resistivity measurements indicated that all samples were semiconducting below room temperature. No distinct variation in resistivity behavior was observed for samples with different holding time or with induced nonstoichiometry.
AB - Polycrystalline samples of stoichiometric spinels, Mg1+xTi2-xO4 (0≤x≤1.0), and spinels with cation diversity, Mg(1+x)yTi2-xO4 and Mg1+xTi(2-x)y,O4 (x=0.4215, y=0.95-1.05), and oxygen deficiency Mg1+xTi2-xO4-δ (x=0.4215, δ=0.05-0.30) were prepared by solid-state reaction of MgO, TiO2 and Ti to examine the effects of the composition and holding time on the structure of the spinel phase, the impurity phase formation behavior and the electrical properties. In addition to Mg2TiO4 (x=1) prepared at 1300°C under an ambient atmosphere, samples were prepared at 1250°C under an argon atmosphere. Compositional analyses revealed that volatilization of compounds and oxidation during firing were negligible. The variation in the unit cell parameter a of the spinel phase indicated solid-solution formation for all stoichiometric samples in spite of the presence of impurities. The impurity-phase formation behavior was strongly dependent upon synthetic conditions, x-value, and induced nonstoichiometry. Other than the insulating Mg2TiO4, resistivity measurements indicated that all samples were semiconducting below room temperature. No distinct variation in resistivity behavior was observed for samples with different holding time or with induced nonstoichiometry.
KW - Electrical properties
KW - Magnesium titanate
KW - Nonstoichiometry
KW - Solid solution
KW - Solid-state reaction
KW - Spinel structure
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M3 - Article
VL - 105
SP - 101
EP - 105
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
SN - 1882-0743
IS - 2
ER -