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| 1 | Enhanced giant dielectric properties and improved nonlinear electrical response in acceptor-donor (Al^(3+), Ta^(5+))-substituted CaCu_(3)Ti_(4)0_(12) ceramics显示文摘The giant dielectric bchavior of CaCu_(3)Ti_(4)0_(12)(CCTO)has been widely investigated owing to its potential applications in electronics;however,the loss tangent(tan8)of this material is too large for many applications.A partial substitution of CCTO ceramics with either Al^(3+) or Ta^(5+)-ions generally results in poorer nonlinear properties and an associated increase in tan8(to~0.29-1.15).However,first-principles calculations showed that self-charge compensation occurs between these two dopant ions when co-doped into Tit sites,which can improve the electrical properties of the grain boundary(GB).Surprisingly,in this study,a greatly enhanced breakdown electric field(~200--6588 V/cm)and nonlinear coefficient(-4.8-15.2)with a significantly reduced tan8(~0.010--0.036)were obtained by simultaneous partial substitution of CCTO with acceptor-donor(Al^(3+),Ta^(5+))dopants to produce(Al^(3+),Ta^(5+))-CCTO ceramics.The reduced tan8 and improved nonlinear properties were attributed to the synergistic effects of the co-dopants in the doped CCTO structure.The signifcant reduction in the mean grain size of the(Al^(3+),Ta^(5+))-CCTO ceramics compared to pure CCTO was mainly because of the Ta^(5+)-ions.Accordingly,the increased GB density due to the reduced grain size and the larger Schottky barrier height(Ф_(b))at the GBs of the co-doped CCTO ceramics were the main reasons for the greatly increased GB resistance,improved nonlinear properties,and reduced tan8 values compared to pure and single-doped CCTO.In addition,high dielectric constant values(ε'≈(0.52-2.7)×10^(4))were obtained.A fine-grained microstructure with highly insulating GBs was obtained by Ta doping,while co-doping with Ta^(5+) and Al^(3+ )resulted in a high Ф_(b).The obtained results are expected to provide useful guidelines for developing new giant dielectric ceramics with excellent dielectric properties. | Jakkree BOONLAKHORN Narong CHANLEK Jedsada MANYAM Pornjuk SREPUSHARAWOOT Sriprajak KRONGSUK Prasit THONGBAI | 2021 | Journal of Advanced Ceramics2021，10，6： | 2 |
| 2 | Opioid-volatile anesthetic synergy:a response surface model with remifentanil and sevoflurane asprototypes显示文摘 | Manyam SC Gupta DK Johnson KB | 2006 | Anesthesiology2006，105，2： | 1 |
| 3 | Bilateral striopallidodentate calcinosis: cerebrospinal fluid, imaging, and electrophysiological studies显示文摘 | Manyam BV Bhatt MH Moore WD | 1992 | Ann Neurol1992，31，4： | 1 |
| 4 | Bilateral striopallidodent- ate calcinosis:clinical characteristics of patients seen in a registry 显示文摘 | Manyam BV Waiters AS Narla KR | 2001 | Mov Disord2001，16，2： | 1 |
| 5 | When is a bispectral index of 60 too low? : Rational processed electroencephalographic targets are dependent on the sedativeopioid ratio显示文摘 | Manyam SC Gupta DK Johnson KB | 2007 | Anesthesiology2007，106，3： | 1 |
| 6 | What is and what is not 'Fahr~s disease' 显示文摘 | Manyam BV | 2005 | Parkinsonism Relat Disord2005，11，2： | 1 |
| 7 | Neuroprotective effects of theantiParkinson drug Mucuna pruriens显示文摘 | Manyam BV Dhanasekaran M Hare TA | 2004 | Phytother Res2004，18，： | 1 |
| 8 | Opioid - volatile anesthetic synergy: a response surface model with remifen- tanil and sevoflurane as prototypes 显示文摘 | Manyam SC Gupta DK Johnson KB | 2006 | Anesthesiology2006，105，2： | 1 |
| 9 | Neuroprotective effects of the antiparkinson drug Mucuna pruriens显示文摘 | Manyam BV Dhanasekaran M Hare TA | 2004 | Phytother Res2004，18，70： | 1 |
| 10 | Isoniazid-induced elevation of CSF GABA levels and effects on chorea in huntington's dis- ease显示文摘 | MANYAM B V LEONARD K THEODORE A | 1981 | Ann Neuroi1981，10，1： | 1 |
| 11 | Bilateral striopallidodentate calcinosis: clinical characteristics of patients seen in a registry显示文摘 | Manyam BV Waiters AS Narla KR | 2001 | Mov Disord2001，16，2： | 1 |
| 12 | What is and what is not Fahr's disease显示文摘 | Manyam BV | 2005 | Parkinsonism Relet Disord2005，11，2： | 1 |
| 13 | Epileptic EEG detection using neural networks and post-classification显示文摘 | PATNAIK M MANYAM K | 2008 | Computer Methods and Programs in Biomedicine2008，91，2： | 1 |
| 14 | H design of F/A-18A auto- matic carrier landing systems显示文摘 | SUBRAH MANYAM M B | 1994 | Journal of Guidance Control and Dynamics1994，17，1： | 1 |
| 15 | A water extract of Mucuna pruriens provides long-term amelioration of parkinsonism with reduced risk for dyskinesias显示文摘 | LIEU C A KUNSELMAN A R MANYAM B V | 2010 | Parkinsonism Relat D2010，16，7： | 1 |
| 16 | Opioid-volatile anesthetic synergy:a response surface model with remifentanil and sevoflurane as prototypes显示文摘 | Manyam SC Gupta DK Johnson KB | 2006 | Anesthesiology2006，105，2： | 1 |
| 17 | Isoniazid - induced elevation of CSF GABA levels and effects on chorea in Huntington's disease 显示文摘 | Manyam B V | 2004 | Annals of Neurology2004，10，1： | 1 |
| 18 | Internal Control Weakness and Cost of Equity:Evidence from SOX Section 404 Disclosures 显示文摘 | Ogneva M Raghunandan K Subra- manyam K R | 2007 | The Accounting Review2007，，82： | 1 |
| 19 | When is a bispectral index of 60 too low? Rational processed electroencephalographic targets are dependent on the sedative-opioid ratio显示文摘 | Manyam SC Gupta DK Johnson KB | 2007 | Anesthesiology2007，106，3： | 1 |
| 20 | Modeling hydraulic properties of sandy soils of Niger using pedotransfer functions 显示文摘 | MANYAME C MORGAN C L HEILMAN J L | 2007 | Geoderma2007，141，： | 1 |
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