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pertain [per·tain || pɜr'teɪn /pɜː-] v. 属于, 附属, 关于useful to elucidate the origin of dielectric loss in dielectric materialsthe levelling of f of ε(T ) is seen.平稳The compounds were monophasic and could be Indexed satisfactorily to a cubic unit cell with parameters of approximatelyThey concluded that the mesoscale disorder of B-site ions played a major role in the microwave loss 中间尺度equally importantthe superlattice reflections are smeared out in the X-ray diffraction patternincrease-then-decreaseSlowly cooled samples exhibit Q values superior to those ofIs about 2 orders of magnitude higher/lower thancongruent ['con·gru·ent || 'kɑŋgrʊənt /'kɒŋ-] adj. 适合的, 符合的, 一致的as a function of reciprocal temperatureswere summarized in Table 2trivalent stateare vitally important for developing new materials with functionality and smartnessmandatory 强制的必不可少的redox titration滴定法Electron energy-loss spectroscopy (EELS)These data explicitly illustrate the evolution in the valenceThis manifested that Sb had a great effect on the hexagonal phase formation in this system.The round-like grains imbedded into the plate-like ones was the typical morphology of these ceramics in the range ofThe growth habit of grain with hexagonal structure is apt to growth into plant-likeapt [æpt]adj. 有...倾向的, 易于...的The present work is adressed to a study of theIdentification of intermediate and final productsThe ordered compounds adopt trigonal symmetry due to rhombohedral distortion along the <111> direction of the cubic cell, together with a slight volume increaseRounded shape grains together with elongated onesspectroscopic data of the pertinent bands pertinent ['per·ti·nent || 'pɜrtnənt /'pɜːtɪ-]adj. 相关的, 切题的, 中肯的adequate dielectric propertiesIn the last two decades, cellular base station technologies proliferated, and dielectric ceramics have known an increasing commercial importance as microwave materials for resonators and filters. proliferate [pro·lif·er·ate || prə'lɪfəreɪt]v. 增殖, 扩散, 激增; 增殖; 扩散; 激增Previous works have been devoted to studying the dielectric behavior of complex perovskites based on their phonon characteristics, whose knowledge helped the authors to understand the dielectric response of the systems.very narrow, intense diffraction peaks can be visualized, and no impurities or secondary phases were detected.Also, the peaks shifted to lower d-spacing for increasing strontium content.The analysis was based on the nomenclature adopted by Lee et al.nomenclature [no·men·cla·ture || nəʊ'mənkleətʃər /nəʊ'menklətʃə]n. 命名法, 术语, 专门语borderline between untilted and antiphase tilted octahedralare being extensively studied owing to their excellent microwave and millimeter-wave dielectric propertiesa priori [英]ˌeɪ praɪˈɔ:raɪ [美]ˌɑpriˈɔri, -ˈori, ˌepraɪˈɔraɪ, -ˈorˌaɪadj. adv. 推理的，演绎的推理地，演绎地;验前;先验[例句]His argument was a priori , but vindicated by events..他的论点是先验性的，但得到了事实的论证。

we observe a beautiful polarization effect with the weakening of several bandsalthough they did not have any experimental confirmation of their hypotheses.Raman-active modes have a quadratic form quadratic [quad·rat·ic || kwɑ'drætɪk /kwɒ-]n. 二次方程式adj. 二次的These two alternatives are completely equivalentWe also measured other samples with smaller grains, as exemplified by the BMN sample sinteredisomer[i·so·mer || 'aɪsəʊmɜr / -mɜː]n.异构体stereoisomer n.立体异构物Huo et al.1 report an elegant approach to address this long-standing challengeThis has limited the study of photochemical synthesis to a fairly small community of specialists.Although this development has fuelled renewed interest in photochemical synthesis, control over the three-dimensional structure of the organic products has remained a problem.ramification[ram·i·fi·ca·tion || ‚ræmɪfɪ'keɪʃn]n.分枝, 树枝, 分歧pharmaceutical[phar·ma·ceu·ti·cal || ‚fɑrmə'suːtɪkl /‚fɑːmə'sju-]adj.制药学的stereochemistry[ster·e·o·chem·is·try || ‚stɪrɪəʊ'kemɪstrɪ/‚ster-]n.立体化学monomeric adj.单体的Stereoselective synthesis therefore remains one of the central challenges in modern synthetic chemistry.fidelity[fi·del·i·ty || fɪ'delətɪ]n.忠实; 忠诚; 诚实radical[rad·i·cal || 'rædɪkl]n.根部; 基本原理; 基础; 激进分子adj.根本的, 基本的; 原本的The discovery of a single transition-metal catalyst that fulfils both roles is a crucial conceptual step forward.the next step will be to show that the new catalytic strategy is applicable to other classes of photoreaction for unmet synthetic applicationsMore broadlycounteract[,coun·ter'act || ‚'kaʊntə'(r)ækt]v.抵消; 阻碍; 中和hurdle[hur·dle || 'hɜrdl /'hɜːdl]n.篱笆; 障碍; 栏v.用篱笆围, 克服, 越过acclaim [ac·claim || ə'kleɪm]n. 欢呼; 称赞; 喝彩v. 向...欢呼; 称赞; 为...喝彩anniversary [an·ni·ver·sa·ry || ‚ænɪ'vɜːsərɪ]n. 周年纪念assay [as·say || ə'seɪ]n. 化验, 分析v. 尝试, 化验but the cellular mechanisms remain controversialInfants with mysterious conditions stand to benefit — but technique raises ethical questions.manure[ma·nure || mə'nʊr /-'njʊə]n.肥料v.施肥于Tibet's fragile易碎的; 脆的environment is being damaged by a paucity少数, 缺乏, 少量of energy, as well as by pollutants and litterto obtain BN films of reasonable thickness, with a large fraction of tetrahedrally coordinated atoms, is problematic.opaque[o·paque || əʊ'peɪk]n.不透明物adj.不透明的, 不传热的After Ti deposition the samples were immediately inserted in the rf sputtering apparatus || ‚æpə'reɪtəs].From a Scherrer analysis of the grain-size-induced full width at half maximum of the Bragg peak, a correlation length of 1.5 nm for cBN was deduced.slit[slɪt]n.裂缝, 狭长的裂口, 投币口v.切开, 使成狭缝, 扯裂exiguity[ex·i·gu·i·ty || ‚eksɪ'gjuːətɪ]n.些许; 微小longitudinal[lon·gi·tu·di·nal || ‚lɑndʒɪ'tuːdɪnl /‚lɒndʒɪ'tjuːdɪnl]adj.轻度的, 纵的, 经线的pertinent['per·ti·nent || 'pɜrtnənt /'pɜːtɪ-]adj.相关的, 切题的, 中肯的The authors are grateful to T. Sasaki, JRC Ispra, for nanoindentation measurements and to C. Lenardi, Dipartimento di Fisica, I Universita` di Milano, for useful discussions.where the subscripts i, j indicate Cartesian components and each ranges over three valueThese studies concluded that they have been shown to exhibit properties that are notably different from their much larger bulk counterpartsThese results differed significantly from the typical single-walled carbon nanotube (SWCNT) construct.The findings of these two studies completed by Zhang and Hoffman initiated our investigation into (h-BN) rings, (B3N3)n [n = 1–10] via the use of electronic structure theory in an attempt to explore and accurately predict the physical properties of these heterogeneous BN low-dimensional materials.helical[hel·i·cal || 'helɪkl]adj.螺旋状的Understanding the stability, structure, and thermal properties of stacked h-BN rings is significant for gaining insight for their future applications.In this Letter, we strive to understand fundamental chemical and physical behavior at the lower limits of existence of these materials.Although it was first synthesized byW.H. Balmain from boric acid and calcium cyanide in 1842, it took until the 1940s before it gained limited economical significance.boron nitride has motivated tremendous amount of theoretical and experimental investigations of its fundamental properties for a long time.where h is Planck’s constant, k B is Boltzmann’s constant, N A is Avogadro’s number, n is the number of atoms in the molecule, M is molecular weight, and q is the density.。