Preparation and characterization of LaSrAlO4 microwave dielectric ceramics

Liu, Xiao Qiang; Chen, Xiao‐Ming; Xiao, Yang

doi:10.1016/s0921-5107(03)00266-6

Cited by 47 publications

(27 citation statements)

References 13 publications

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“…So it suggests the metastability of these two compounds. In our previous work, the stability of CaR'AlO 4 (R'=Nd, Sm, and Y) and SrR"AlO 4 (R"=La, Nd, and Sm) ceramics has been proved [20][21][22]. Smirnov et al have pointed out the metastability of CaLaAlO 4 [16][17][18][19], which is in accordance with our tolerance factor analysis.…”

Section: Resultssupporting

confidence: 88%

“…These constraints are mainly assumed to depend on steric and chemical effects related to the simultaneous presence of A 3+ , B 3+ and C 2+ cations in the KF layers [8,16,17]. As reported previously by Smirnov et al [19], CaLaAlO 4 crystal is of metastability and will decompose into LaAlO 3 -like phase at 1,200°C. In this article, the stability of some formerly investigated MRAlO 4 (M=Sr and Ca; R=Nd, Sm, and Y) ceramics with K 2 NiF 4 structure is discussed [20][21][22], and (Ca 1−x Sr x ) LaAlO 4 ceramics are prepared along with the determination of microwave dielectric properties and microstructure, as well as the effects of Sr substitution for Ca on the stability of K 2 NiF 4 structure. and 2-6 mm high and then sintered at 1,375-1475°C in air for 3 h. After cooling from sintering temperature to 1,100°C at a rate of 2°C/min, the ceramics were cooled inside the furnace.…”

Section: Introductionmentioning

confidence: 99%

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Stability and microwave dielectric characteristics of (Ca1−x Sr x )LaAlO4 ceramics

2007

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The stability of K 2 NiF 4 structure in MRAlO 4 (M= Sr and Ca; R==La, Nd, Sm, and Y) ceramics was discussed via calculating the relative difference between the tolerance factors for ABCO 4 and ABO 3 structure, and the K 2 NiF 4 structure became unstable when the above difference was greater than 4.3%. Among the above ceramics, CaLaAlO 4 and SrYAlO 4 were not stable. To improve the stability of K 2 NiF 4 structure in CaLaAlO 4 , the effects of Sr substitution for Ca were investigated. The stability of K 2 NiF 4 structure in (Ca 1−x Sr x )LaAlO 4 ceramics increased with increasing x, and it became stable when x >0.9. Good microwave dielectric properties were achieved in (Ca 0.05 Sr 0.95 )LaAlO 4 ceramics: e=16.7, Q.f =28,171 GHz, t f =−52.4 ppm/°C.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Stability and microwave dielectric characteristics of (Ca1−x Sr x )LaAlO4 ceramics

2007

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“…Recently, SrRAlO 4 (R=La, Nd, Sm) ceramics with K 2 NiF 4 layered structure and I4/mmm space group have been put forward as candidates of ultra-low loss microwave dielectric materials for high-band microwave application [3,4]. Compared with the typical high-Q microwave dielectric ceramics such as Ba(Mg 1/3 Ta 2/3 )O 3 [5], Ba(Zn 1/3 Ta 2/3 )O 3 [6], and Ba(Zn 1/3 Nb 2/3 )O 3 [7], SrRAlO 4 without noble elements such as Ta and Nb have the merits of relative low cost combined with its easier preparation.…”

Section: Introductionmentioning

confidence: 99%

Structure and microwave dielectric properties of SrSmAlO4-Sr2TiO4 solid solutions

Liu

et al. 2014

J Electroceram

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The structure and microwave dielectric properties of Sr 1+x Sm 1-x Al 1-x Ti x O 4 ceramics were determined in the entire composition range of x=0~1.0. The single phase solid solutions with K 2 NiF 4 structure were obtained, and the Q×f value decreased with increasing x at first (up to 0.15) and then turned to increase and reached the maximum at x=0.9. The dielectric constant ε r increased from 19.2 to 36.5 and the temperature coefficient of resonant frequency τ f ascended monotonously with increasing x. The variation tendency of Q×f value with x reflected the competition result of the interlayer polarization and the structure inhomogeneity. On the other hand, infrared (IR) reflectivity spectra were measured and fitted by means of classical oscillator model simulation. The intrinsic dielectric loss tangent extrapolated from IR range showed a similar changing trend with the measured ones. Moreover, the fitting results offered a detail inside view of the intrinsic factors and the variation of the dielectric loss could be well explained.

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“…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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Preparation and characterization of LaSrAlO4 microwave dielectric ceramics

Cited by 47 publications

References 13 publications

Stability and microwave dielectric characteristics of (Ca1−x Sr x )LaAlO4 ceramics

Stability and microwave dielectric characteristics of (Ca1−x Sr x )LaAlO4 ceramics

Structure and microwave dielectric properties of SrSmAlO4-Sr2TiO4 solid solutions

Preparation and dielectric characterization of BaLaAlO4 ceramics

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