Chemical bond properties and Mössbauer spectroscopy in REBa2Cu3O7 (RE=Eu, Y)

Gao, Faming; Li, Dongchun; He, Jingliang; Tian, Yongjun; Zhang, Siyuan

doi:10.1016/s0921-4534(01)01065-6

Cited by 13 publications

(14 citation statements)

References 15 publications

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“…With these considerations in mind, P-V-L bond theory has been applied to several complex compounds. For instance, in a high-temperature oxide superconductor structure, the relationships between critical transition temperature and covalency have been established in REBa 2 Cu 3 O 7 (RE = Ln) 63,64 and HgBa 2 Ca n−1 Cu n O 2n+2+δ systems. 65 The calculation of chemical bond parameters of a hexagonal ferrite (such as M-type BaFe 12 O 19 or W-type BaCo 2 Fe 16 O 27 ) crystal solved the calculation of isomeric displacement of Mössbauer spectra; 66 the stability of crystal structures was predicted via the calculations of lattice energy and thermal expansion of solid materials, 67,68 etc.…”

Section: Introductionmentioning

confidence: 99%

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Yang

Zhang

2020

Inorg. Chem. Front.

130

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Section: Introductionmentioning

confidence: 99%

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Yang

Zhang

2020

Inorg. Chem. Front.

130

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“…The spermatogenic suppression achieved was disappointing in the patch group (35% azoospermia, n=20) in contrast to the group who received injections (93% azoospermia, n=14) [59]. In a Chinese study using Sino-implant (containing 75 mg LNG) in conjunction with 250mg TU im 4 weekly, only 6 out of 16 men became azoospermic; however, the drug doses used were low [72].…”

Section: Long-acting Combination Regimesmentioning

confidence: 97%

Hormonal Contraception in Men

Walton

Anderson²

2005

curr drug targets immune endocr metabol disord

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All major advances in the development of hormonal methods of contraception over the past 40 years have been exclusively female orientated with male hormonal contraception forever "just around the corner". Despite this, the last few years have seen a significant increase in the pace of research and increased involvement from the pharmaceutical industry. This is essential if the progress derived from the public sector is to be translated into a real product for widespread use. Current male methods of contraception, condoms and vasectomy, are relied on by 30% of couples throughout the world but there have been no new male contraceptive methods introduced in the last century. There is currently an increasing emphasis on male involvement in family planning, and evidence both that some men would be keen to shoulder this responsibility and that their partners would trust them to do so. There are several potential novel approaches to male contraception, but the hormonal one is the only one at the stage of clinical research. This method is based on the normal regulation of spermatogenesis by the pituitary gonadotrophins: suppression of gonadotrophin secretion results in a reduction in the rate of spermatogenesis, and azoospermia, the absence of sperm from the ejaculate, can be achieved. Current approaches are now getting close to the ideal of inducing azoospermia in all men. This approach also results in suppression of testicular testosterone production, thus androgen 'add-back' is an essential component of a contraceptive regime. Many different steroids and delivery methods -oral, buccal, transdermal, subcutaneous implants- are under exploration at present, each with their own advantages and drawbacks. The use of synthetic androgens is also starting to be explored: these have the potential advantage of offering tissue-specific actions.

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“…Tanaka [50] estimated the ionicity of Ba O = and Y-O bonds over 98%, whereas Meng et al [51] obtained the value more than 94%, while Liu et al [52] and Gao et al [53] estimated it to be greater than 96%. In case of Cu-O bonds our value (average) of ionicity is ~65%, whereas Tanaka [50] and Meng et al [51] estimated it above 81%, and Liu et al [52] got an average value above 71% except in case of Cu (1) -O (4) bond for which their value is 53.8%.…”

Section: Extension To Ternary and Multibond Complex Crystalsmentioning

confidence: 99%

A Model of Band Gaps and Ionicity in Crystal

Pathak

Dutta

Gorai³

et al. 2023

Preprint

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A new and simple model of homopolar and heteropolar band gaps and ionicity is presented which overcomes the discrepancies of PVL (Philips, Van Vechten and Levine) theory and also of the other scales, results of which are not in conformity with the findings of hardness/bulk modulus reported in recent years. The proposed model requires the knowledge of bond length as the only input parameter and avoids the demand of additional parameters obtained from the detailed crystal structure as required in PVL theory. It has been applied to group-IV and IV-IV, IV-VI, III-V, II-VI and I-VII semiconductors of Zinc blende/wurtzite and rocksalt structures and group II-VI and I-VII ionic compounds of rocksalt and cesium chloride structures. It has also been utilised to evaluate ionicity of boron-boron bonds in B12 icosahedra. One critical and two sub-critical ionicities have also been proposed in this study. Besides, a new relation is proposed for direct evaluation of heteropolar band gap in terms of homopolar band gap of the materials studied. Results of the new model are in conformity with the trend of bulk modulus/ hardness reported and also of bond length. The proposed model has further been extended to ternary (I-III-VI2 and II-IV-V2) semiconductors and multibond high Tc – Superconductor, YBa2Cu3O7. Results obtained are quite reasonable.

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Chemical bond properties and Mössbauer spectroscopy in REBa2Cu3O7 (RE=Eu, Y)

Cited by 13 publications

References 15 publications

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Hormonal Contraception in Men

A Model of Band Gaps and Ionicity in Crystal

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