Crystals Homeotypic to Quartz

Crystals are grown by hydrothermal growth method, a- to -Quartz like transition takes place at 950°C in this material. Material properties and their temperature coefficients see Table 7.6. 

Property GaP04 AIPO4 Temperature eoefhcients GaP04 AIPO4 

Berlinite crystals are very much similar to quartz. Stmctural phase change takes place at the temperature 584°C (Blistanov et al. 1982). For material properties see Table 7.6. Similarly to quartz berlinite crystals undergo a- to jS-phase transition. Crystals are grown by hydrothermal method (Detaint et al. 1985 Motchary and Chvanski 2001) Berlinite crystals exhibit higher electromechanical coupling coefficient than quartz. 

Electromechanical coupling coefficient is higher for LGS than for quartz. Some of the LGS non-linear material coefficients are pubhshed in Sorokin et al. (1996). Temperature coefficients published by different authors show values widely scattered. For material properties and their temperature coefficierrts see Tables 7.7 and 7.8. (Adachi et al. 1999 Bohm et al. 1999, 2000 Ilyaev et al. 1986 Kaminskii et al. 1983a,b, 1984 Onozato et al. 2000 Pisarevskii et al. 1998 Silvestrova et al. 1986, 1987, 1993 Sorokin etal. 1996). 

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