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

doi:10.1063/1.3129867

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

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

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 (T_tilt) 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. T_tilt 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 T_tilt to RT for BLN. τf in these 12R -type hexagonal perovskites can therefore be tuned by controlling the tolerance factor and therefore T_tilt in a manner similar to that used for many Ba- and Sr-based 3C -type AB O₃ perovskites.

Original language	English
Article number	192904
Journal	Applied Physics Letters
Volume	94
Issue number	19
DOIs	https://doi.org/10.1063/1.3129867
Publication status	Published - 2009

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@article{59c87393c0a545b4b43c965f265a68f4,

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.}",

year = "2009",

doi = "10.1063/1.3129867",

language = "English",

volume = "94",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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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

Y1 - 2009

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

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