12194-71-7Relevant academic research and scientific papers
Thermal expansion and electrical conductivity of CaTi0.9M 0.1O3-δ (M = Fe, Cu, Al)
Murashkina,Demina,Filonova,Demin,Korobitsin
, p. 296 - 298 (2008)
The thermal expansion of CaTi0.9M0.1O 3-δ (M = Fe, Cu, Al) samples has been measured, and their lattice parameters have been refined in space group Pnma. The three materials are shown to be mixed conductors, p-type at high
Contribution of structure to temperature dependence of resonant frequency in the (1 - x)La(Zn1/2Ti1/2)O3·xATiO3 (A = Ca, Sr) system
Cho, Seo-Yong,Youn, Hyuk-Joon,Lee, Hyo-Jong,Hong, Kug Sun
, p. 753 - 758 (2001)
The crystal structure and microwave dielectric properties of the (1 - x)La(Zn1/2Ti1/2)O3·xSrTiO3 and (1 - x)La(Zn1/2Ti1/2)-O3·xCaTiO3 system were investigated. X-ray powder diffraction showed that cation ordering disappeared at x > 0.3 for both systems. However, infrared spectra demonstrated that short-range cation ordering could exist at x = 0.4. Permittivity and the temperature coefficient of the resonant frequency (τf) of both systems exhibited nonmonotonic variations with composition. Both systems exhibited a τf of zero at the same composition of x = 0.5 although the τf of SrTiO3 was about two times larger than that of CaTiO3. The behavior of the permittivity and τf were described by the tilting of oxygen octahedra and cation ordering. The relation between τf and cation ordering of La(Zn1/2Ti1/2)O3 was discussed in conjunction with the experimental results on metal halides. It is suggested that cation ordering induced a negative τf and suppressed the increase of permittivity for compositions between x = 0 to x = 0.5 for (1 - x)La(Zn1/2Ti1/2)O3·xSrTiO3 and (1 - x)La(Zn1/2Ti1/2)-O3·xCaTiO3 systems.
Correlation between the dielectric properties and local electronic structure of copper doped calcium titanate
Singh, Jitendra Pal,Gautam, Sanjeev,Kumar, Parmod,Tripathi, Ambuj,Chen, Jin-Ming,Chae, Keun Hwa,Asokan
, p. 84 - 89 (2013)
Copper-doped calcium titanate (CuxCa1-xTiO 3, x = 0.0, 0.01, 0.02 and 0.03) ceramic system was synthesized using solid state reaction method. X-ray diffraction and Raman spectroscopic studies reveal the presence of Pbnm sp
Hole-doping and pressure effects on the metal-insulator transition in single crystals of Y1-xCaxTiO3 (0.37 ≤ x ≤ 0.41)
Tsubota, Masami,Iga, Fumitoshi,Nakano, Toshihiro,Uchihira, Kazuyuki,Kura, Souichiro,Takemura, Masaki,Bando, Yoshio,Umeo, Kazunori,Takabatake, Toshiro,Nishibori, Eiji,Takata, Masaki,Sakata, Makoto,Kato, Kenichi,Ohishi, Yasuo
, p. 3182 - 3188 (2003)
The measurements of electrical resistivity, magnetic susceptibility, specific heat, thermopower and powder x-ray diffraction under pressure have been performed on single crystals of Y1-xCaxTiO3 (0.37 ≤ x ≤ 0.41) to investi
MIITiO(C2O4)2 · 4H2O (MII = Mg, Ca, Sr or Ba) as precursors in the formation of MIITiO3 powders
Pfaff, G.,Schmidt, F.,Ludwig, W.,Feltz, A.
, p. 771 - 780 (1988)
A synthesis route is described for the preparation of the alkaline earth metal titanyl oxalates MIITiO(C2O4)2·4H2O (MII=Mg, Ca, Sr or Ba). The thermal decompositions of these compounds were studied by means of DTA and TG in comparisons with X-ray measurements. The final products MIITiO3 were characterized morphologically.
Compatibility of TiO2 with a CaO-CaCl2 melt
Lebedev,Sal'nikov,Tarabaev,Sizikov,Rymkevich
, p. 1491 - 1497 (2007)
Interaction of TiO2 with a CaO-CaCl2 melt was studied to determine whether electrolytic production of titanium from oxide raw materials is possible.
Dielectric and ordering behavior in PbxCa1-xTiO3
Ganesh,Goo
, p. 653 - 662 (1997)
The dielectric properties and microstructure of PbxCa1-xTiO3 are reported. At room temperature, PbxCa1-xTiO3 is orthorhombic for compositions where x is 0.1 and 0.2, pseudocubic for composi
Temperature dependence of luminescence properties of praseodymium-doped perovskite CaTiO3:Pr3+
Inaguma, Yoshiyuki,Tsuchiya, Takeshi,Mori, Yuki,Imade, Yuki,Sato, Nobuhisa,Katsumata, Tetsuhiro,Mori, Daisuke
, p. 168 - 171 (2012)
A polycrystalline perovskite CaTiO3:Pr3+ was synthesized and the temperature dependence of luminescence properties was investigated in the temperature range of 6-440 K. CaTiO3:Pr 3+ exhibits red emission ascribed to the f-f transition from the excited state 1D2 to the ground state 3H 4 of Pr3+ upon the band gap photo-excitation between valence and conduction band, and upon the IVCT (inter valence charge transfer between Pr3+ and Ti4+) photo-excitation. Below 330 K, the emission intensity upon the band gap excitation increased with temperature, while the temperature dependence of emission intensity upon the IVCT excitation is relatively small, indicating that the electron transfer process between Pr3+ and the host accompanied by the band gap excitation is thermally activated. Above 330 K, the thermal quenching of emission was observed upon both of the band gap and the IVCT excitation and the energy barrier for thermal quenching was estimated to be ～5500 cm-1.
A novel method of synthesis and microstructural investigation of calcium titanate powders
Lei, Xianjun,Xu, Baoqiang,Yang, Bin,Xu, Binbin,Guo, Xutao
, p. 916 - 922 (2017)
A novel method, using calcium chloride bihydrate (CaCl2·2H2O and TiO2) as raw materials, to synthesize crystalline calcium titanate (CaTiO3) has been investigated by thermodynamic calculation and X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), differential scanning calorimetric-thermogravimetric analysis (DSC-TG), high resolution transmission electron microscopy (HR-TEM) etc. Using XRD technique analyzed experimental results revealed success of thermal sintering process, in which the mass ratio of M CaCl2·2H2O/MTiO2?=?2:1, holding temperature of 1073?K, preservation time 2?h, could be used to produce crystalline CaTiO3powders. Ratio of Ca/Ti/O?=?1:1:3 was verified by EDS pot-scan. According to SEM observation, the crystalline CaTiO3powders are mainly composed of many separated particles with average size approximately 10?μm and have been demonstrated a strongly faceted morphology. The lattice plane, (112) is clearly observed in the HR-TEM micrograph and the lattice distance was measured as 0.27?nm.
Sintering, microstructural and dilatometric studies of combustion synthesized synroc phases
Muthuraman,Patil,Senbagaraman,Umarji
, p. 1375 - 1381 (1996)
Sintering, microstructure, and linear thermal expansion properties of Synroc-B and constituent phases, viz. perovskite CaTiO3, zirconolite ZrTi2O7, hollandite (ideal formula BaAl2Ti6O16) have been investigated. Synroc-B powder when pelletized and sintered at 1250°C for 2 h achieved >95% theoretical density. Sintered Synroc-B has a linear thermal expansion coefficient α of 8.72 × 10-6 K-1 and Vicker's microhardness 9.88 GPa. The linear thermal expansion curves did not show any hystersis indicating the absence of microcracking in the sintered bodies.
