Influence of octahedral tilting on the microwave dielectric properties of A3 LaNb3 O12 hexagonal perovskites (A=Ba, Sr)

Ritesh Rawal, Andrew J. McQueen, Lisa J. Gillie, Neil C. Hyatt, Emma E. McCabe, Kumaravinothan Samara, Neil McN Alford, Antonio Feteira, Ian M. Reaney, Derek C. Sinclair

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Abstract

Rietveld refinement of room temperature (RT) neutron diffraction (ND) data reveals 12R -type hexagonal perovskites Ba3 LaNb3 O 12 (BLN) and Sr3 LaNb3 O12 (SLN) to adopt space group R 3- with tilted NbO6 octahedra. The presence of an octahedral tilt transition (Ttilt) at 465 K in BLN from R 3- to R 3- m is proposed from a combination of high temperature ND data and fixed frequency permittivity measurements. Ttilt is estimated to be much higher at ∼720 K for SLN. The large difference in the RT temperature coefficient of the resonant frequency (τf), -100 ppm/K for BLN compared to -5 ppm/K for SLN, is attributed to the closer proximity of Ttilt to RT for BLN. τf in these 12R -type hexagonal perovskites can therefore be tuned by controlling the tolerance factor and therefore Ttilt in a manner similar to that used for many Ba- and Sr-based 3C -type AB O3 perovskites.

Original languageEnglish
Article number192904
JournalApplied Physics Letters
Volume94
Issue number19
DOIs
Publication statusPublished - 2009

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perovskites
dielectric properties
microwaves
neutron diffraction
room temperature
resonant frequencies
proximity
permittivity
coefficients
temperature

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Rawal, Ritesh ; McQueen, Andrew J. ; Gillie, Lisa J. ; Hyatt, Neil C. ; McCabe, Emma E. ; Samara, Kumaravinothan ; Alford, Neil McN ; Feteira, Antonio ; Reaney, Ian M. ; Sinclair, Derek C. / Influence of octahedral tilting on the microwave dielectric properties of A3 LaNb3 O12 hexagonal perovskites (A=Ba, Sr). In: Applied Physics Letters. 2009 ; Vol. 94, No. 19.
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title = "Influence of octahedral tilting on the microwave dielectric properties of A3 LaNb3 O12 hexagonal perovskites (A=Ba, Sr)",
abstract = "Rietveld refinement of room temperature (RT) neutron diffraction (ND) data reveals 12R -type hexagonal perovskites Ba3 LaNb3 O 12 (BLN) and Sr3 LaNb3 O12 (SLN) to adopt space group R 3- with tilted NbO6 octahedra. The presence of an octahedral tilt transition (Ttilt) at 465 K in BLN from R 3- to R 3- m is proposed from a combination of high temperature ND data and fixed frequency permittivity measurements. Ttilt is estimated to be much higher at ∼720 K for SLN. The large difference in the RT temperature coefficient of the resonant frequency (τf), -100 ppm/K for BLN compared to -5 ppm/K for SLN, is attributed to the closer proximity of Ttilt to RT for BLN. τf in these 12R -type hexagonal perovskites can therefore be tuned by controlling the tolerance factor and therefore Ttilt in a manner similar to that used for many Ba- and Sr-based 3C -type AB O3 perovskites.",
author = "Ritesh Rawal and McQueen, {Andrew J.} and Gillie, {Lisa J.} and Hyatt, {Neil C.} and McCabe, {Emma E.} and Kumaravinothan Samara and Alford, {Neil McN} and Antonio Feteira and Reaney, {Ian M.} and Sinclair, {Derek C.}",
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Rawal, R, McQueen, AJ, Gillie, LJ, Hyatt, NC, McCabe, EE, Samara, K, Alford, NM, Feteira, A, Reaney, IM & Sinclair, DC 2009, 'Influence of octahedral tilting on the microwave dielectric properties of A3 LaNb3 O12 hexagonal perovskites (A=Ba, Sr)', Applied Physics Letters, vol. 94, no. 19, 192904. https://doi.org/10.1063/1.3129867

Influence of octahedral tilting on the microwave dielectric properties of A3 LaNb3 O12 hexagonal perovskites (A=Ba, Sr). / Rawal, Ritesh; McQueen, Andrew J.; Gillie, Lisa J.; Hyatt, Neil C.; McCabe, Emma E.; Samara, Kumaravinothan; Alford, Neil McN; Feteira, Antonio; Reaney, Ian M.; Sinclair, Derek C.

In: Applied Physics Letters, Vol. 94, No. 19, 192904, 2009.

Research output: Contribution to journalArticle

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T1 - Influence of octahedral tilting on the microwave dielectric properties of A3 LaNb3 O12 hexagonal perovskites (A=Ba, Sr)

AU - Rawal, Ritesh

AU - McQueen, Andrew J.

AU - Gillie, Lisa J.

AU - Hyatt, Neil C.

AU - McCabe, Emma E.

AU - Samara, Kumaravinothan

AU - Alford, Neil McN

AU - Feteira, Antonio

AU - Reaney, Ian M.

AU - Sinclair, Derek C.

PY - 2009

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N2 - Rietveld refinement of room temperature (RT) neutron diffraction (ND) data reveals 12R -type hexagonal perovskites Ba3 LaNb3 O 12 (BLN) and Sr3 LaNb3 O12 (SLN) to adopt space group R 3- with tilted NbO6 octahedra. The presence of an octahedral tilt transition (Ttilt) at 465 K in BLN from R 3- to R 3- m is proposed from a combination of high temperature ND data and fixed frequency permittivity measurements. Ttilt is estimated to be much higher at ∼720 K for SLN. The large difference in the RT temperature coefficient of the resonant frequency (τf), -100 ppm/K for BLN compared to -5 ppm/K for SLN, is attributed to the closer proximity of Ttilt to RT for BLN. τf in these 12R -type hexagonal perovskites can therefore be tuned by controlling the tolerance factor and therefore Ttilt in a manner similar to that used for many Ba- and Sr-based 3C -type AB O3 perovskites.

AB - Rietveld refinement of room temperature (RT) neutron diffraction (ND) data reveals 12R -type hexagonal perovskites Ba3 LaNb3 O 12 (BLN) and Sr3 LaNb3 O12 (SLN) to adopt space group R 3- with tilted NbO6 octahedra. The presence of an octahedral tilt transition (Ttilt) at 465 K in BLN from R 3- to R 3- m is proposed from a combination of high temperature ND data and fixed frequency permittivity measurements. Ttilt is estimated to be much higher at ∼720 K for SLN. The large difference in the RT temperature coefficient of the resonant frequency (τf), -100 ppm/K for BLN compared to -5 ppm/K for SLN, is attributed to the closer proximity of Ttilt to RT for BLN. τf in these 12R -type hexagonal perovskites can therefore be tuned by controlling the tolerance factor and therefore Ttilt in a manner similar to that used for many Ba- and Sr-based 3C -type AB O3 perovskites.

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