Phase transitions of CaTiO3 ceramics sintered with the aid of NaF and MgF2

Talantikite, Djahida; Taïbi-Benziada, Laldja

doi:10.1016/j.solidstatesciences.2008.05.002

Cited by 9 publications

(3 citation statements)

References 30 publications

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“…The phase transitions detected by DSC above room temperature at T 1 and T 2 respectively are pointed out as slight shoulders or inflexion points on the dielectric curves, as observed in a previous work on oxifluorides deriving from CaTiO 3 [19].…”

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confidence: 78%

Lead Free CaTiO<sub>3</sub>-Based Ceramics: Sintering, Phase Transitions and Dielectric Properties

Taïbi-Benziada

Nemouchi

2010

MSF

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Various chemical compositions (1-x)CaTiO3+xMgF2+xLiF were prepared and dry-ground. The powder mixtures were pressed to pellets and co-fired at 900°C for 2h. The obtained ceramics were investigated by XRD, SEM, DSC and dielectric measurements. A new solid solution with nominal composition Ca1-xMgx(Ti1-xLix)O3-3xF3x occurred in the initial composition range 0 ≤ x ≤ 0.25. The fluoride additive MgF2+LiF lowered significantly the sintering temperature of pure CaTiO3. Above room temperature, one or two second order phase transitions were detected by DSC and confirmed by dielectric measurements. Moreover, below room temperature, a frequency peak dependent on the permittivity and losses was observed and the quantum paraelectric behaviour of CaTiO3 disappeared with increasing x. These oxifluorides could be of interest for electronic applications.

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confidence: 78%

Lead Free CaTiO<sub>3</sub>-Based Ceramics: Sintering, Phase Transitions and Dielectric Properties

Taïbi-Benziada

Nemouchi

2010

MSF

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“…Table2summarizes the dielectric characteristics of (Ba,Na)(Ti,Mg)(O,F) 3 ceramics obtained at 1 kHz. The dielectric constant and the dielectric losses are better than those found for CaTiO 3 -NaF-MgF 2 and SrTiO 3 -NaF-MgF 2 systems previously studied[10,11].…”

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confidence: 49%

Preparation and Characterization of New Oxyfluoride Phases (Ba,Na)(Ti,Mg)(O,F)

Talantikite-Touati¹,

Benziada

2010

Advances in Science and Technology

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Oxyfluoride phases have been synthesized in free atmosphere, using the initially synthesized perovskite BaTiO3 and the fluorides NaF and MgF2. The purity of BaTiO3 and oxyfluorides has been checked by X–Ray diffraction (XRD).The microstructures of these phases are observed by scanning electron microscopy. The phase transitions have been investigated by dielectric measurements and differential scanning calorimetry (DSC).

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“…However, the dielectric loss is highly variable from sample to sample varying over several orders of magnitude. Powder purity is an important factor in the production of low‐loss alumina . In polycrystalline alumina, the quality factor is dramatically decreased by the impurity degree.…”

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Study of the performance of dielectric resonator antennas based on the matrix composite of Al₂O₃ – CaTiO₃

Oliveira

Gouveia

Silva

et al. 2015

Micro & Optical Tech Letters

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In this article is present the structural and dielectric microwave properties of Alumina – CaTiO3 ceramic composite with the addition of CaTiO3 and your performance as a dielectric resonator antenna (DRA). Alumina has a negative temperature variation of resonant frequency coefficient τf, while CaTiO3 has a high positive temperature coefficient. Also influence of calcium titanate on densification and porosity of the composite is presented. The CaTiO3 was added (2.5% to 10% wt. amount) in order to analyze changes in the dielectric properties. Samples were characterized by X‐ray diffraction. Dielectric properties were investigated by Hakki‐Coleman methods and the experimental characteristics parameters like return loss, bandwidth, and input impedance are presented and compared with numerical simulations. The results obtained shows the formation of secondary phases (Hibonite and TiO2), with the dielectric permittivity and dielectric loss increasing and decreasing with calcium titanate concentration, respectively. The application of DRA was verified and all samples tested presented return loss below −10 dB in the resonant frequency. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:963–969, 2015

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Phase transitions of CaTiO3 ceramics sintered with the aid of NaF and MgF2

Cited by 9 publications

References 30 publications

Lead Free CaTiO<sub>3</sub>-Based Ceramics: Sintering, Phase Transitions and Dielectric Properties

Lead Free CaTiO<sub>3</sub>-Based Ceramics: Sintering, Phase Transitions and Dielectric Properties

Preparation and Characterization of New Oxyfluoride Phases (Ba,Na)(Ti,Mg)(O,F)

Study of the performance of dielectric resonator antennas based on the matrix composite of Al₂O₃ – CaTiO₃

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Phase transitions of CaTiO3 ceramics sintered with the aid of NaF and MgF2

Cited by 9 publications

References 30 publications

Lead Free CaTiO<sub>3</sub>-Based Ceramics: Sintering, Phase Transitions and Dielectric Properties

Lead Free CaTiO<sub>3</sub>-Based Ceramics: Sintering, Phase Transitions and Dielectric Properties

Preparation and Characterization of New Oxyfluoride Phases (Ba,Na)(Ti,Mg)(O,F)

Study of the performance of dielectric resonator antennas based on the matrix composite of Al2O3 – CaTiO3

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Study of the performance of dielectric resonator antennas based on the matrix composite of Al₂O₃ – CaTiO₃