Thermal properties of CaNdAlO4 and SrLaAlO4 single crystals

Byszewski, P.; Domagała, J. Z.; Fink‐Finowicki, J.; Pajączkowska, A.

doi:10.1016/0025-5408(92)90026-v

Cited by 39 publications

(20 citation statements)

References 6 publications

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“…At 593 and 699 K, the DTA measurement shows two anomalies presented by peaks with different forms, the first one reveals a second-order transition and the second one is of first order. Both effects are identical to those reported in the literature of related compounds LaSrAlO 4 and CaNdAlO 4 [21]. Authors of this reference indicated that the plausible cause of the first effect may be a second-order phase transition which involves rearrangement of ions in the unit cell.…”

Section: Chemical Analysissupporting

confidence: 74%

Synthesis, structural and electrical characterizations of LaSrCu0.4Al0.6O4−δ

Negri

Leoni

Hassen

2017

Mater Renew Sustain Energy

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A new compound LaSrCu 0.4 Al 0.6 O 4-d has been prepared by sol gel method, annealed at 1623 K in oxygen gas flow and examined by X-ray diffraction. Rietveld refinement shows that the sample adopts the K 2 NiF 4 -type structure, space group I4/mmm (a = 3.7694(2) and c = 12.8248(5) Ǻ , Z = 2). Vibrational properties were investigated using Raman scattering and the most characteristic vibrations are discussed with reference to the available structural data. Differential thermal analysis shows two endothermic effects at 329 and 593 K and one exothermic at 693 K. Dielectric study as a function of temperature in the frequency range of 1 kHz-1 MHz has confirmed the observed phase transitions. The value of the measured dielectric constant depends on the frequency and undergoes a large increase near the phase transition temperatures indicating a diffuse behavior of these transitions. Variation of conductivity as a function of temperature shows that the compound has a semiconducting behavior. Oxygen vacancies could be the possible ionic charge carriers. The electrical transport mechanism agrees with Adiabatic Small Polaron Hopping model.

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Section: Chemical Analysissupporting

confidence: 74%

Synthesis, structural and electrical characterizations of LaSrCu0.4Al0.6O4−δ

Negri

Leoni

Hassen

2017

Mater Renew Sustain Energy

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“…SLA and SLG single crystals are interesting as substrates for high temperature superconducting thin films from the standpoint of lattice matching and their elastic and elastooptic properties [3,4]. Some physical properties of these crystals have been reported recently, but still a little is known about their elastic and elastooptic properties [2,[5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Elastooptic Constants of SrLaAlO₄and SrLaGaO₄Single Crystals Determined by Brillouin Scattering

et al. 1997

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In this paper we report the elastooptic constants pig of strontium 1an-thanum aluminate, SrLaΑlO4 and strontium lanthanum gallate SrLaGaO4 single crystals, which were determined at room temperature using TriIlouin scattering method. In order to investigate the elastooptic constants of SrLaAlO4 and SrLaGaO4 single crystals, a substitution method proposed by Cummins and Schoen, and developed by Nelson and Lax was used. The obtained results are also discussed in terms of the nature defects which might arise in these crystals during growth process.

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“…Recently, a group of compounds with general chemical formula ABCO 4 (A=Ca or Sr; B=Y, La, Nd or Sm; C=Al or Ga) and tetragonal K 2 NiF 4 -type structure within space group I4/mmm have attracted much scientific attention because of their potential applications as substrates for high-T c superconductor thin films [1][2][3][4][5][6][7][8][9][10]. In the author's group, SrRAlO 4 (R = La, Nd, Sm) and CaRAlO 4 (R = Nd, Sm, Y) ceramics have been systematically investigated for microwave resonator application, and the best microwave dielectric characteristics were obtained in SrSmAlO 4 and CaSmAlO 4 among these ceramics [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Preparation and dielectric characterization of BaLaAlO4 ceramics

2007

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In the present work, BaLaAlO 4 ceramics with orthorhombic structure similar to K 2 SO 4 in space group P2 1 2 1 2 1 were prepared by a solid state sintering process. The dense BaLaAlO 4 ceramics with minor amount of secondary phase have a low dielectric loss and a temperature stable dielectric constant with obvious frequency dependence. A dielectric constant around 15 was obtained at 12 GHz in the present ceramics together with a Qf value over 5,000 GHz.

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Thermal properties of CaNdAlO4 and SrLaAlO4 single crystals

Cited by 39 publications

References 6 publications

Synthesis, structural and electrical characterizations of LaSrCu0.4Al0.6O4−δ

Synthesis, structural and electrical characterizations of LaSrCu0.4Al0.6O4−δ

Elastooptic Constants of SrLaAlO₄and SrLaGaO₄Single Crystals Determined by Brillouin Scattering

Preparation and dielectric characterization of BaLaAlO4 ceramics

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Thermal properties of CaNdAlO4 and SrLaAlO4 single crystals

Cited by 39 publications

References 6 publications

Synthesis, structural and electrical characterizations of LaSrCu0.4Al0.6O4−δ

Synthesis, structural and electrical characterizations of LaSrCu0.4Al0.6O4−δ

Elastooptic Constants of SrLaAlO4and SrLaGaO4Single Crystals Determined by Brillouin Scattering

Preparation and dielectric characterization of BaLaAlO4 ceramics

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Elastooptic Constants of SrLaAlO₄and SrLaGaO₄Single Crystals Determined by Brillouin Scattering