摘要:

The spontaneous polarizations in LiNbO3, LiTaO3, and Ba2NaNb5O15have been measured directly at room temperature by a field reversal method and found to bePs(LiNbO3) = 0.71 C/m2,Ps(LiTaO3) = 0.50 C/m2, andPs(Ba2NaNb5O15) = 0.40 C/m2. Using these values we show that the linear electro‐optic effect in these materials is related fundamentally to a biased quadratic effect associated with each BO6octahedron. Based on this result, predictions are made of the spontaneous polarization in other oxygen‐octahedra ferroelectrics.

ISSN:0003-6951    

DOI:10.1063/1.1651955

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The temperature coefficient of resistance of a thin‐film resistor depends on the mismatch in the thermal expansion coefficient between the film and its substrate. This Letter presents a calculation of this effect and shows that the effect can be quite significant for typical thin films.

ISSN:0003-6951    

DOI:10.1063/1.1651956

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The three linear invariants associated with the third‐order elastic coefficients are derived explicitly, and are used to relate the elastic parameters of a single crystal of arbitrary symmetry to those of a polycrystalline quasi‐isotropic aggregate of the same material.

ISSN:0003-6951    

DOI:10.1063/1.1651957

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

TiO2single crystals were grown in the absence of hydrogen, using an induction plasma torch. The electrical conductivity of these crystals does not vary in time under the application of an electric field. To explain the conductivity creep in conventionally grown TiO2single crystals, a mechanism is proposed based on iron‐hydrogen impurity complexes which dissociate under the application of a voltage and can be restored by heating the crystal to 800°C.

ISSN:0003-6951    

DOI:10.1063/1.1651958

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

The vacuum evaporation rates of the (100) face of sodium chloride single crystals were measured in the temperature range 770–900°K. By increasing the dislocation density in the NaCl crystals (106to 107cm−2) the steady‐state vacuum evaporation rates were increased by a factor of two. The vapor composition remained unchanged over the different dislocation density crystals.

ISSN:0003-6951    

DOI:10.1063/1.1651959

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

It is predicted that stable current filaments can be formed in an avalanching pin structure. The current density in a filament and its radius are determined by a dynamic equilibrium between carrier production by impact ionization and loss of carriers by diffusion.

ISSN:0003-6951    

DOI:10.1063/1.1651960

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Experimental evidence of change in photoelectric threshold energy for emission of electrons from silicon into oxide in MOS structure, due to heating under biased conditions is given. A model to explain this behavior has been proposed.

ISSN:0003-6951    

DOI:10.1063/1.1651961

出版商:AIP    

年代:1968

数据来源: AIP

摘要:

Synthetic single‐crystal proustite pumped with collimated pulsed ruby laser radiation has been used to convert 10.6 &mgr;m radiation to the visible. Measured values of photon conversion efficiency (Ns/Nir= 1.4 × 10−6) and phase‐matched bandwidth (540 Å at 10.6 &mgr;m) are in good agreement with theory.

ISSN:0003-6951    

DOI:10.1063/1.1651962

出版商:AIP    

年代:1968

数据来源: AIP

ISSN:0003-6951    

DOI:10.1063/1.1651965

出版商:AIP    

年代:1968

数据来源: AIP