2000/12/22 by M. M. Savosta, Savosta, M. M., V. D. Doroshev +22
Chemistry · Materials Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Solid-state spectroscopy and crystallography #Superconductivity (cond-mat.supr-con) #X-ray Diffraction in Crystallography #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0012429
6 pages, 5 figures, 2 tables, RevTex, twocolumn
arxiv created 2000/12/22 · openalex publication_date 2000/12/22 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The NQR on Ba nuclei was studied in four samples of BaBiO3 prepared in different ways and, in addition, in BaPbO3. The spectrum of 137Ba at T=4.2 K consists of relatively broad line centered near 18 MHz for all BaBiO3 samples and near 13 MHz for BaPbO3. The integrated intensity of 137Ba resonance in ceramic sample BaBiO3 synthesized at 800 C is approximately two times larger than in ceramic samples and single crystal prepared at 930-1080 C. The decrease of the NQR signal can be attributed to the partial disordering of charge disproportionated Bi ions on the two inequivalent sites. The broadening of the resonance indicates that local distortions of crystal structure exist in both compounds. The point charge model was used to analyse the electric field gradient on the Ba sites