Propagation Loss Characteristics of Berlinite

Steinberg, R. F.; Roy, Manas Kumar; Estes, A.K.; Chi, Baolin; Morris, Randy

doi:10.1109/ultsym.1984.198306

Cited by 5 publications

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“…These variations appear in the same temperature range as the anomalies observed in propagation loss-frequency-temperature characteristics. These anomalies have been attributed (Detaint et al, 1980;Steinberg et al, 1984) to water impurities in these hydrothermally grown crystals. This explanation is qualitatively valid and in good agreement with the changes of the deformation contrast observed during the thermal cycles.…”

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“…In particular, A1PO4 shows an ~-fl transition occurring at 853 K instead of 846 K for quartz (Van Tendeloo, Van Larduyt & Amelinckx, 1976;Bachheimer, Berge, Dolino, Saint-Gregoire & Zeyen, 1984). In evaluating berlinite as a replacement for quartz in highfrequency acoustic-wave devices, anomalies were observed in its propagation loss-frequency-temperature characteristics (Detaint, Poignant & Toudic, 1980;Steinberg, Roy, Estes, Chai & Morris, 1984). In an attempt to explain these electrical anomalies, we shall present in this paper some results concerning the defects in a berlinite sample observed by X-ray topography above RT.…”

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Observations of growth defects in berlinite by high-temperature X-ray topography

Zarka¹,

Capelle²

1985

J Appl Cryst

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Growth defects in a synthetic berlinite sample were studied at high temperature (300--500 K) by X-ray topography. Preliminary observations of contrast changes with temperature are reported.During the past few years there has been a resurgence of interest in berlinite (AIPO4) as a possible substitute for quartz in piezoelectric device applications. Berlinite has a similar structure (Schwarzenbach, 1966) to quartz at room temperature (RT) and at higher temperature exhibits the same type of polymorphism. In particular, A1PO4 shows an ~-fl transition occurring at 853 K instead of 846 K for quartz (Van Tendeloo, Van Larduyt & Amelinckx, 1976;Bachheimer, Berge, Dolino, Saint-Gregoire & Zeyen, 1984). In evaluating berlinite as a replacement for quartz in highfrequency acoustic-wave devices, anomalies were observed in its propagation loss-frequency-temperature characteristics (Detaint, Poignant & Toudic, 1980;Steinberg, Roy, Estes, Chai & Morris, 1984). In an attempt to explain these electrical anomalies, we shall present in this paper some results concerning the defects in a berlinite sample observed by X-ray topography above RT.(a) (b) (c) (d) (e) Fig. l(a).

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confidence: 99%