Structure of lead zirconium oxide: Evidence from NMR

Korniyenko, S. M.; Bykov, I. P.; Glinchuk, M. D.; Laguta, V. V.; Jastrabı́k, L.

doi:10.1051/epjap:1999193

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…(7) Interaction with magnetic lead nuclei accounts for 57% of the total value of M 2 , interaction with 47,49 Ti gives 40%, and 17 O gives about 3% of M 2 . The Pb NMR data for ceramic PbTiO 3 is available [20]. Authors of the above paper claim that their data is in agreement with the estimate according to formula (6).…”

supporting

confidence: 80%

“…r j and r k are the distances from a given 207 Pb nucleus to all other nuclei with nonzero spin; the first summation is performed over the 207 Pb sites (magnetic moment µ = 0.59µ N [19]), the second summation is over the following sites: 47 Ti (spin I = 5/2, magnetic moment [20]. Authors of the above paper claim that their data is in agreement with the estimate according to formula (6).…”

mentioning

confidence: 53%

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Suggested search forPb207nuclear Schiff moment inPbTiO3
Mukhamedjanov
¹
,
Sushkov
²

2005
Phys. Rev. A
31
4
55
2
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We suggest two types of experiments, NMR and macroscopic magnetometry, with solid PbTiO3 to search for the nuclear Schiff moment of 207 Pb. Both kinds of experiments promise substantial improvement over the presently achieved sensitivities. Statistical considerations show that the improvement of the current sensitivity can be up to 10 orders of magnitude for the magnetometry experiment and up to 6 orders of magnitude for the NMR experiment. Such significant enhancement is due to the strong internal electric field of the ferroelectric, as well as due to the possibility to cool the nuclear-spin subsystem in the compound down to nanokelvin temperatures. PACS numbers: 11.30.Er, 32.10.Dk, 67.80.Jd The existence of permanent electric dipole moment (EDM) of a quantum particle requires that fundamental parity (P) and time-reversal (T) symmetries are violated. By the CPT-theorem, this would also mean the violation of the combined CP (charge conjugation-parity) symmetry. Studies of T and CP violation in Nature provide valuable information for the theories of baryogenesis, and for our understanding of fundamental interactions in general. Thus, considerable effort has been put into searches for EDMs of particles, atoms and molecules.The current experimental upper limit on the neutron EDM is d n ≤ 6.3 × 10 −26 e cm [1]. Experiments with paramagnetic atoms and molecules, the most sensitive of which was performed with Tl atoms [2], provide upper limit on the electron EDM, d e ≤ 1.6 × 10 −27 e cm. The most sensitive experiment with diamagnetic atoms is performed with 199 Hg vapor [3]; it gives the upper limit on the EDM of 199 Hg atom d( 199 Hg) ≤ 2.1 × 10 −28 e cm. This EDM is mainly induced by the nuclear Schiff moment, S, which is usually defined by the P-and T-odd electrostatic potential it generates [4]:Atomic calculations [5,6] [12]. Since Xe atoms are diamagnetic, the measurement is mainly aimed at the 129 Xe nuclear Schiff moment. By statistical considerations only, the sensitivity of the experiment is d( 129 Xe) ∼ 3 × 10 −37 e cm for 10 days of averaging [12]. Taking into account the smaller nuclear charge of Xe, this effectively means improvement by 8 orders of magnitude when compared to the present result (2) for 199 Hg. The limitations because of the systematic effects are also discussed in Ref. [12]. The solid state experiment with gadolinium garnet, recently suggested by Lamoreaux [13] to measure the electron EDM, promises 5 order of magnitude improvement over the current Tl result (statistical estimate corresponding to 10 days of averaging.)In the present paper we suggest to use ferroelectric PbTiO 3 to measure Schiff moment of 207 Pb nucleus. Possibility to measure the macroscopic magnetization induced by electric field, as was suggested by Lamoreaux for gadolinium garnets [13], looks most promising because of the large internal electric field in ferroelectric. In addition, the nuclear-spin subsystem of the compound can be magnetically cooled down to nanokelvin temperatures. For a 10-day averaging, statisti...

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supporting

confidence: 80%

mentioning

confidence: 53%

Suggested search forPb207nuclear Schiff moment inPbTiO3
Mukhamedjanov
¹
,
Sushkov
²

2005
Phys. Rev. A
31
4
55
2
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“…The extracted data are consistent with the average structure reported from diffraction studies, and NMR data consistent with our analysis of PZ have previously been reported. − Furthermore, the sharp, well-resolved signals indicate that any structural disorder present in our sample occurs on a much smaller scale than the differences between the two crystallographic sites. ,, While disorder may exist on a local scale, most of the sample is thus well-described by the ordered average structure. This result is in accordance with a previous 207 Pb NMR study which obtained sharp powder line shapes, indicating no random deviations from orthorhombic symmetry and no random Pb displacements in PZ . It also supports our assumption that the deviations from the expected polarization configuration that we have observed with STEM are of a purely local nature as well as additional confirmation that our sample of PZ exhibits the expected crystal structure.…”

Section: Resultsmentioning

confidence: 99%

“…This result is in accordance with a previous Pb NMR study which obtained sharp powder line shapes, indicating no random deviations from orthorhombic symmetry and no random Pb displacements in PZ. 64 It also supports our assumption that the deviations from the expected polarization configuration that we have observed with STEM are of a purely local nature as well as additional confirmation that our sample of PZ exhibits the expected crystal structure.…”

Section: Combined 3-dimensional Characterization Of Pzmentioning

confidence: 99%

Probing Cation Displacements in Antiferroelectrics: A Joint NMR and TEM Approach

Ding,

Egert,

Huang

et al. 2023

Chem. Mater.

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High-resolution scanning transmission electron microscopy (STEM) enjoys great advantages for atomic-resolution visualization of the atomic structure, while failing to disclose structural information along the atomic columns. On the other hand, solid-state nuclear magnetic resonance (NMR) spectroscopy is highly sensitive to the three-dimensional, local structure around atoms in the bulk sample but typically cannot provide an intuitive visualization of the structure. Thus, the combination of atomicresolution (S)TEM and solid-state NMR spectroscopy has the potential to establish an in-depth, multidimensional structural understanding. Here, we explore this novel strategy to probe the structure of antiferroelectric perovskite oxides PbZrO 3 and (Pb,La)(Zr,Sn,Ti)O 3 . We combine complementary information regarding the in-plane displacement vector mapping from STEM with the analysis of local PbO 12 environments from 207 Pb NMR spectroscopy to provide unprecedented insight into Pb displacements. For PbZrO 3 , an ordered 4-fold in-plane displacement modulation is clearly revealed via STEM imaging; meanwhile, the out-of-plane information is provided by two discrete 207 Pb NMR signals attributed to two crystallographic Pb sites in the 2D-PASS NMR spectrum. In the chemically modified (Pb,La)(Zr,Sn,Ti)O 3 system, disorder of the structure manifests in not only an inhomogeneous displacement modulation but also a broad distribution of 207 Pb chemical shifts, related to significant disorder of displacement magnitudes and a favoring of larger displacements. We show that the displacement distribution depends on whether both in-plane and out-of-plane displacements or only out-of-plane displacements are considered. Our findings demonstrate the advantages in the structural analysis using combined TEM and NMR approaches, hence laying the foundation work for controlling and optimizing functional properties.

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O-Pb-Zr (Oxygen-Lead-Zirconium)

2007

Landolt-Börnstein - Group IV Physical Chemistry

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Structure of lead zirconium oxide: Evidence from NMR

Cited by 6 publications

References 13 publications

Suggested search forPb207nuclear Schiff moment inPbTiO3
Mukhamedjanov
¹
,
Sushkov
²

2005
Phys. Rev. A
31
4
55
2
View full text Add to dashboard Cite

Suggested search forPb207nuclear Schiff moment inPbTiO3
Mukhamedjanov
¹
,
Sushkov
²

2005
Phys. Rev. A
31
4
55
2
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Probing Cation Displacements in Antiferroelectrics: A Joint NMR and TEM Approach

O-Pb-Zr (Oxygen-Lead-Zirconium)

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Structure of lead zirconium oxide: Evidence from NMR

Cited by 6 publications

References 13 publications

Suggested search forPb207nuclear Schiff moment inPbTiO3Mukhamedjanov1, Sushkov2 2005Phys. Rev. A314552View full textAdd to dashboardCite

Suggested search forPb207nuclear Schiff moment inPbTiO3Mukhamedjanov1, Sushkov2 2005Phys. Rev. A314552View full textAdd to dashboardCite

Probing Cation Displacements in Antiferroelectrics: A Joint NMR and TEM Approach

O-Pb-Zr (Oxygen-Lead-Zirconium)

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Product

Resources

About

Suggested search forPb207nuclear Schiff moment inPbTiO3
Mukhamedjanov
¹
,
Sushkov
²

2005
Phys. Rev. A
31
4
55
2
View full text Add to dashboard Cite

Suggested search forPb207nuclear Schiff moment inPbTiO3
Mukhamedjanov
¹
,
Sushkov
²

2005
Phys. Rev. A
31
4
55
2
View full text Add to dashboard Cite