Synthesis, characterization and microwave dielectric properties of nanocrystalline CaZrO3 ceramics

Prasanth, C.S.; Kumar, H. Padma; Pazhani, R.; Solomon, Sam; Thomas, J.K.

doi:10.1016/j.jallcom.2007.09.098

Cited by 89 publications

(33 citation statements)

References 15 publications

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“…However, the characteristic XRD lines belonging to portlandite were not observed due to their superposition with the ones of the other compounds XRD diffractograms, especially with those of zirconia; or furthermore due to the poorly crystallized nature of this solid. The CaZrO 3 is an extremely ionic solid which belongs to the perovskite structure, with orthorhombic symmetry (Orera et al, 1998;Prasanth et al, 2008 …”

Section: Ftir Spectra Analysis Of Specimen D-z During Firingmentioning

confidence: 99%

“…On the other hand, the weak absorptions remaining in the spectrum of the end products calcined at 1400ºC, located at 3400, 1630 and 1575 cm -1 , are due to the presence of adsorbed moisture in the samples. In the same way as in zirconia these signals are assigned to O-H, H-O-H, and M-OH vibrations, respectively (Prasanth et al, 2008). The spectral features of the samples are maintained, showing the maximum definition when the end products are formed, in the final thermal treatment at 1400ºC.…”

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confidence: 91%

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Characterization of the Firing Steps and Phases Formed in Mg-Zr-Containing Refractory Dolomitic Materials

Lavat¹,

Grasselli²,

Lovecchio³

2011

Advances in Ceramics - Characterization, Raw Materials, Processing, Properties, Degradation and Healing

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Section: Ftir Spectra Analysis Of Specimen D-z During Firingmentioning

confidence: 99%

mentioning

confidence: 91%

Characterization of the Firing Steps and Phases Formed in Mg-Zr-Containing Refractory Dolomitic Materials

Lavat¹,

Grasselli²,

Lovecchio³

2011

Advances in Ceramics - Characterization, Raw Materials, Processing, Properties, Degradation and Healing

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“…Recently, nanocrystalline CZ powders prepared through combustion synthesis were found to reduce the sintering temperature of CZ ceramics by 150 °C to 1500 °C. 9 These ceramics, have a density of 98% and a dielectric constant of 23.8. 9 Through our synthetic routes, we have shown that we can reduce the sintering temperature even further to 1375 °C and obtained a density of greater than 99% for CZ ceramics from our CZ-6 batch powder.…”

Section: Electrical Characterization Of Cz Pelletsmentioning

confidence: 99%

“…Recently nanocrystalline CZ powders prepared through combustion synthesis were found to reduce the sintering temperature by 150 to 1500 °C and have a density of 98%. 9 This initial demonstration shows the promise of using highly active powders in MLCC devices to enhance performance.…”

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confidence: 95%

Oxalate co-precipitation synthesis of calcium zirconate and calcium titanate powders.

Hernandez-Sanchez¹,

Tuttle²

2009

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Fine powders of calcium zirconate (CaZrO 3 , CZ) and calcium titanate (CaTiO 3 , CT) were synthesized using a nonaqueous oxalate co-precipitation route from Ca(NO 3 ) 2 •4 H 2 O and group(IV) n-butoxides (Ti(OBu n ) 4 or Zr(OBu n ) 4 ). Several reaction conditions and batch sizes (2-35 g) were explored to determine their influence on final particle size, morphology, and phase. Characterization of the as-prepared oxalate precursors, oven dried oxalate precursors (60-90 C), and calcined powders (635-900 C) were analyzed with TGA/DTA, XRD, TEM, and SEM. Densification and sintering studies on pressed CZ pellets at 1375 and 1400 C were also performed. Through the developed oxalate co-precipitation route, densification temperatures for CZ were lowered by 125 C from the 1500 o C firing temperature required for conventional mixed oxide powders. Low field electrical tests of the CZ pellets indicated excellent dielectric properties with dielectric constants of ~30 and a dissipation factor of 0.0004 were measured at 1 kHz.

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“…Moreover, trivalent cations, e.g., indium, scandium, gallium change the conduct of CaZrO 3 and in this state it acts as a proton conductor. [1][2][3][4][5][6] Suzuki et al 7 investigated porous, In-doped CaZrO 3 / MgO composites with respect to the CH 4 -sensitivity in air. The samples were prepared from a high-purity natural dolomite, ZrO 2 , In 2 O 3 and LiF.…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous ceramic materials based on CaZrO3

Śnieżek¹,

Szczerba²,

Jastrzębska³

2015

Mater. Tehnol.

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The present study was devoted to an investigation of the synthesis conditions and the influence of Sn ions on the production of a CaZrO3 porous structure. Porous ceramics based on CaZrO3 with a SnO addition were prepared by means of pressureless sintering. The study presents the influence of the type of the starting materials and the firing procedures on the microstructures of the CaZrO3 materials. Two different firing procedures were applied. The samples were obtained from pure chemical reagents CaCO3 or CaO and ZrO2. SnO was added in the mass fraction of 2 %. The prepared materials were investigated in terms of phase composition with the XRD. The microstructure was analyzed using the SEM/EDS and mercury porosimetry methods. It was found that using CaCO3 in a one-step firing process at 1650°C with a soaking time of 10 h allowed us to obtain porous zirconate ceramics with a porosity of about 44 %. The second synthesis, where CaO was used, allowed us to obtain a porosity of about 36 %. During the firing solid solutions containing Sn ions in CaZrO3 and ZrO2 were formed. No other compounds containing Sn ions were identified. It was found that these ions played a significant role in the formation of a stable porous microstructure. The final materials mainly consisted of CaZrO3 and a small amount of ZrO2. The obtained porous CaZrO3 materials with an excellent oxidation and alkali resistance in a wide temperature range could be potential candidates for the use as membranes and filters. Keywords: calcium zirconate, porous ceramics, solid solution Ta {tudija je namenjena preiskavi razmer pri sintezi in vplivu ionov Sn na izdelavo porozne strukture CaZrO3. Porozna keramika na osnovi CaZrO3 z dodatkom SnO je bila pripravljena s sintranjem brez tlaka. [tudija predstavlja vpliv vrste izhodnega materiala in procesa`ganja na mikrostrukturo materiala CaZrO3. Uporabljena sta bila dva na~ina`ganja. Vzorci so bili izdelani iz~istih kemijskih sestavin CaCO3 ali CaO in ZrO2. Masni dele`dodanega SnO je bil w = 2 %. Fazna sestava pripravljenega materiala je bila analizirana z rentgensko difrakcijo. Mikrostruktura je bila analizirana s SEM/EDS in s porozimetrijo z`ivim srebrom. Ugotovljeno je, da uporaba CaCO3 v enostopenjskem postopku`arjenja 10 h na 1650°C omogo~a pridobitev porozne cirkonske keramike s poroznostjo okrog 44 %. Druga sinteza, kjer je bil uporabljen CaO, omogo~a doseganje poroznosti okrog 36 %. Med`ganjem je nastala trdna raztopina, ki je vsebovala ione Sn v CaZrO3 in v ZrO2. Ni bila ugotovljena nobena druga sestavina, ki bi vsebovala ione Sn. Navedeno je, da ti ioni igrajo pomembno vlogo pri nastanku stabilne porozne mikrostrukture. Kon~ni materiali so vsebovali prete`no CaZrO3 in majhno koli~ino ZrO2. Dobljen porozni kerami~ni CaZrO3-material z odli~no odpornostjo proti oksidaciji in alkalijam v {irokem temperaturnem intervalu je lahko potencialni kandidat za uporabo v obliki membrane in filtrov. Klju~ne besede: kalcijev cirkonat, porozne keramike, trdna raztopina

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Synthesis, characterization and microwave dielectric properties of nanocrystalline CaZrO3 ceramics

Cited by 89 publications

References 15 publications

Characterization of the Firing Steps and Phases Formed in Mg-Zr-Containing Refractory Dolomitic Materials

Characterization of the Firing Steps and Phases Formed in Mg-Zr-Containing Refractory Dolomitic Materials

Oxalate co-precipitation synthesis of calcium zirconate and calcium titanate powders.

Preparation of porous ceramic materials based on CaZrO3

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